Hardware and Installation Manual
Outdoor Modular Solar Inverter - HEC-UL & HEC-UL+ Series Hardware and Installation Manual Outdoor Modular Solar Inverter – HEC-UL & HEC-UL+ Series Hardware and Installation Manual HEC_v2 Edition: September 2014 FSMTHW05EI Rev. E FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS About this guide PURPOSE This manual contains important instructions for the installation and maintenance of Power Electronics FREESUN HEC-UL and HEC-UL+ inverters. INTENDED USERS This manual is intended for qualified customers who will install, operate and maintain Power Electronics FREESUN HEC-UL inverters. Only trained electricians approved by the responsible energy supply company may install and commission the inverters. The instructions assume that the installer is familiar with electrical installation rules and regulations. REFERENCE MANUALS The following reference guides are available for the Freesun Inverters: Freesun Programming and Software Manual. Freesun Hardware and Installation Manual. POWER ELECTRONICS CONTACT INFORMATION Power Electronics USA Inc. th 505 Montgomery Street, 11 Floor San Francisco CA 94111 UNITED STATES OF AMERICA US Sales: 1-415-874-3668 Fax: (415) 874-3001 Email: [email protected] Website: www.power-electronics.us 2 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS SAFETY SYMBOLS Always follow safety instructions to prevent accidents and potential hazards from occurring. WARNINGS IN THIS DOCUMENT WARNING CAUTION The warning symbol indicates conditions or actions that could result in personal injury or death. A qualifier, such as “Hazardous Voltage”, may follow the warning title. The Caution symbol Identifies conditions or actions that could result in damage to the inverter or equipment. Particular attention should be given because dangerous voltage may be present. Maintenance operation should be done by qualified personnel. SAFETY SYMBOLS 3 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS Revision History Date Revision Description 13 / 03 / 2013 14 / 01 / 2014 14 / 03 / 2014 06 / 06 / 2014 A B C D 24 / 09 / 2014 E First Edition HEC_V2 Disconnecting Unit Disconnecting Unit, Important Safety Instructions, Technical Characteristics Inverter dimensions without Disconnecting Unit The equipment and technical documentation are periodically updated. Power Electronics reserves the right to modify all or part of the contents of this manual without previous notice. To consult the most updated information of this product you might access through our website www.power-electronics.us where the latest version of this manual can be downloaded. 4 POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES TABLE OF CONTENTS About this guide......................................................................................................................... Purpose .................................................................................................................................. Intended Users ....................................................................................................................... Reference Manuals ................................................................................................................ Power Electronics Contact Information .................................................................................. Safety Symbols ...................................................................................................................... Revision History ..................................................................................................................... 2 2 2 2 2 3 4 IMPORTANT SAFETY INSTRUCTIONS ..................................................................................... Important ................................................................................................................................ Safety Standards .................................................................................................................... Personal Protection Equipment (PPE) Requirements ............................................................ Operator Safety ...................................................................................................................... Integrated Electrical Safety Features ..................................................................................... System Repair and Troubleshooting ...................................................................................... Lockout / Tagout..................................................................................................................... Ground Fault Warning ............................................................................................................ Marks, Symbols and Controls on the inverter ......................................................................... 7 7 8 8 8 12 12 12 13 13 1. INTRODUCTION .................................................................................................................... 15 2. CONFIGURATION TABLE & STANDARD RATINGS .......................................................... 2.1. Configuration Table ...................................................................................................... 2.2. Standard ratings ........................................................................................................... 16 16 17 3. TECHNICAL CHARACTERISTICS ....................................................................................... 3.1. Environmental Specifications ....................................................................................... 3.2. Control Interface Specifications .................................................................................... 3.3. Undervoltage, Overvoltage and Frequency Ride Through Characteristics .................. 3.4. Freesun 390Vac, 1000Vdc, 300kVA to 1250kVA ......................................................... 3.5. Freesun 360Vac, 1000Vdc, 280kVA to 1110kVA ......................................................... 3.6. Freesun 330Vac, 1000Vdc, 250kVA to 1000kVA ......................................................... 3.7. Freesun 208Vac, 600Vdc, 160kVA to 640kVA ............................................................. 3.8. Operational Diagram .................................................................................................... 19 19 19 19 20 21 22 23 24 4. DIMENSIONS AND WEIGHTS .............................................................................................. 4.1. HEC-UL+ Series ......................................................................................................... 4.2. HEC-UL Series ........................................................................................................... 4.3. HEC-UL Series with External Disconnecting Unit ....................................................... 25 25 26 27 5. HANDLING, TRANSPORTATION AND INSTALLATION ..................................................... 5.1. Delivery and Storage .................................................................................................... 5.2. Handling and Transportation ........................................................................................ 5.3. Installation requirements .............................................................................................. 5.4. Suggested Foundations ............................................................................................... 5.5. Disconnecting Unit Assembly for HEC-UL Inverters .................................................... 5.6. Cooling System ............................................................................................................ 5.7. Noise Levels................................................................................................................. 28 28 28 31 32 33 34 36 6. WIRING ACCESS AND CONNECTIONS .............................................................................. 6.1. Ground connection ....................................................................................................... 6.2. DC connections ............................................................................................................ 6.2.1 DC connection for HEC-UL+ Inverters ..................................................................... 6.2.2 DC connection for HEC-UL Inverters ....................................................................... 6.3. AC connection .............................................................................................................. 6.4. Overvoltage protections ............................................................................................... 6.5. Ground Fault protections .............................................................................................. 6.6. Main circuit protections................................................................................................. 6.7 Installation protection ................................................................................................... 6.8. Auxiliary Power Source ................................................................................................ 6.9. External Control Connections....................................................................................... 6.9. Control connection ....................................................................................................... 37 37 39 39 41 43 45 46 46 47 48 49 49 INDEX 5 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 7. COMMISSIONING ................................................................................................................. 7.1. Initial Conditions ........................................................................................................... 7.2. First Time Switch On .................................................................................................... 7.3. Switch Off ..................................................................................................................... 51 51 51 53 8. PREVENTIVE MAINTENANCE ............................................................................................. 54 Figure 0.1 Inverter controls .............................................................................................................. 14 Figure 1.1 General view of the frame 3 FREESUN HEC-UL+ Series inverter .................................15 Figure 3.1 Operational Diagram HEC-UL & HEC-UL+ Series.......................................................... 24 Figure 4.1 HEC-UL+ Frame 3 .......................................................................................................... 25 Figure 4.2 HEC-UL Frame 3 ............................................................................................................ 26 Figure 4.3 HEC-UL Frame 3 with external Disconnecting Unit ........................................................ 27 Figure 5.1 Inverter crane transport recommendations [mm/in] ........................................................ 29 Figure 5.2 Disconnecting Unit crane transport recommendations ................................................... 30 Figure 5.3 Floor fixation [mm/in]....................................................................................................... 31 Figure 5.4 Inverter clearances [mm/in] ............................................................................................. 31 Figure 5.5 Assembly kit.................................................................................................................... 33 Figure 5.6 Cabinet assembly kit connections ................................................................................... 33 Figure 5.7 Connection busbars fixation ............................................................................................ 34 Figure 5.8 Mating flange connection ................................................................................................ 34 Figure 5.9 Cooling system ............................................................................................................... 34 Figure 5.10 Filter clean/replacement ................................................................................................ 35 Figure 5.11 Filter clean/replacement ................................................................................................ 35 Figure 6.1 PE connections [mm/in] .................................................................................................. 38 Figure 6.2 HEC-UL+ DC cables access ........................................................................................... 39 Figure 6.3 DC input connection in the Disconnecting Unit module .................................................. 40 Figure 6.4 HEC-UL DC cables access [mm/in] ................................................................................ 41 Figure 6.5 DC input connection in the Disconnecting Unit cabinet................................................... 42 Figure 6.6 AC module cabinet cables access .................................................................................. 43 Figure 6.7 AC output connection busbars [mm/in] ........................................................................... 44 Figure 6.8 DC overvoltage protection .............................................................................................. 45 Figure 6.9 Control wiring restrictions................................................................................................ 49 Figure 6.10 Control terminals for the user ........................................................................................ 50 Figure 7.1 FREESUN internal view. Inverter modules rear view (left), front view (center) and AC module (right) ................................................................................................................................... 52 6 POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for FREESUN HEC-UL and HEC-UL+ by Power Electronics that shall be followed during installation and maintenance of the solar inverter. IMPORTANT! Read this manual carefully to maximize the performance of this product and to ensure its safe use and installation. In order to properly use the FREESUN inverter, follow all instructions described in the installation manual referred to transport, installation, electrical connection and commissioning of the equipment. Power Electronics accepts no responsibility or liability for any and all damage resulting from inappropriate use of the equipment. The information contained in the installation guide must be observed when installing the inverter. WARNING The Freesun inverter system presents a SHOCK HAZARD. Read and retain the Installation Manual for future reference. Before installing the Freesun inverter, read all instructions, cautionary markings and other appropriate sections of this manual. Failure to follow these warnings could result in severe shock or even death. Exercise extreme caution at all times to prevent possible accidents. These instructions are not meant to cover every safety situation nor replace any local or site specific safety procedure. The information in this section is intended as a supplement to local or site specific procedures. Power Electronics does not assume responsibility for the compliance or noncompliance of any code, national or local of the proper installation of the Freesun inverter. A potential for personal injury and/or equipment damage exists if the electrical codes and these instructions are not followed. CAUTION Adhere to local site regulation. Perform all electrical work in accordance with local, national and/or international electrical codes. Use insulate tools to reduce the chance of short-circuits while working with the equipment. Keep all doors closed during equipment operation. Always follow proper lockout/tagout procedures. IMPORTANT SAFETY INSTRUCTIONS 7 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS SAFETY STANDARDS The following standards apply to the components: UL-1741 – UL (Underwriters Laboratory) Standard for Safety for Inverters, Converters, Charge Controllers, and Interconnection System Equipment (ISE) for Us in Utility Interactive (grid connected) Power Systems. IEEE-1547. IEEE-519 IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems. NEC (National Electric Code)/NFPA-70E. CSA 22.2 No.107.1-01. CSA 22.1-12. PERSONAL PROTECTION EQUIPMENT (PPE) REQUIREMENTS PPE is required for repair and maintenance of a Freesun inverter. PPE includes but is not limited to: Hard Hat. Safety Glasses. 100% cotton, long pants (no shorts, no synthetic materials). Electrical Hazard (EH) rated safety shoes. Leather work gloves. FR long sleeve shirt, no synthetic materials. Ear protection. Refer to OSHA 29CFR 1910.137 for Personal Protection Equipment (PPE) for working with high voltage electrical equipment. OPERATOR SAFETY CAUTION The inverter operates at a high voltage (1,000Vdc maximum). Do not touch the DC input terminals or cables. Touching the DC terminals may result in personal injury or death. The system has sufficient energy to sustain an arc flash. De-energize the equipment prior to any maintenance procedure. Always wear Personal Protective Equipment (PPE) while maintaining equipment that is exposed and energized. Always use insulated tools. Always follow proper lockout/tagout procedures. Operating or maintaining energized equipment without appropriate PPE and insulated tools and without following proper lockout/tagout procedures may result in personal injury or death. 8 IMPORTANT SAFETY INSTRUCTIONS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES WARNING Do not remove the protective panels except for periodic inspections or wiring, even if the input power is not applied. Otherwise, you may access the charged circuits and get an electric shock. Do not open the doors while the inverter is working. Otherwise, you may get an electric shock. Do not open the doors when it is raining or when humidity exceeds 95%. Otherwise, you may get an electric shock and the equipment could be damaged. Operate the switches with dry hands. Otherwise, you may get an electric shock. Do not use cables with damaged insulation. Otherwise, you may get an electric shock. Do not subject the cables to abrasions, excessive stress, heavy loads or pinching. Otherwise, you may get an electric shock. CAUTION Install the inverter on a non-flammable surface. Do not place flammable material nearby. Otherwise, fire could occur. Disconnect the input power if the solar inverter gets damaged. Otherwise, it could result in a secondary accident or fire. After the input power is applied or removed, the inverter will remain hot for a couple of minutes. Touching internal hot parts may result in skin burns. Do not apply power to a damaged inverter or to an inverter with parts missing even if the installation is complete. Otherwise, you may get an electric shock. Do not allow lint, paper, wood chips, dust, metallic chips or other foreign matter into the inverter. Otherwise, fire or accident could occur. IMPORTANT SAFETY INSTRUCTIONS 9 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS CAUTION SAFETY Before operating the solar inverter, read this manual thoroughly to gain an understanding of the unit. If any doubt exists then please contact POWER ELECTRONICS, (1-415-874-3668) or your nearest agent. Handle the solar inverter with care according to its weight. Install the inverter according to the instructions within this manual. Do not place heavy objects on the inverter. Ensure that the mounting orientation is correct. Do not drop the inverter or subject it to impact. The Freesun inverters contain static sensitive printed circuits boards. Use static safety procedures when handling these boards. Avoid installing the inverter in conditions that differ from those described in the Technical Characteristics section. The cabinet doors must only be opened for commissioning, maintenance and troubleshooting, as well as for data query and parameter setting. The device is equipped with several fans for cooling. To perform any work on the fans is required that the equipment is switched off as explained in the correspondent section. This procedure should be taken into account for commissioning, maintenance and repair work. The device fans and the power unit create significant levels of operating noise. In addition to this, a fault in the device can lead to very high sound levels. We recommend the use of ear protection when in the vicinity of the device for extended periods. Immediately after isolating the device, depending on the operating conditions, certain components can be very hot (e. g. fuses, transformer core, sine wave filter, heatsinks, etc.). Safety gloves should always be worn when working near components that can be expected to be very hot. We recommend using safety gloves and glasses during all work on the inverter. TRIAL RUN Verify all parameters before operating the inverter. Always apply voltage and current signals to each terminal that are within levels indicated in this manual. Otherwise, damage to the inverter may result. OPERATION PRECAUTIONS 10 Do not modify or alter anything within the inverter. IMPORTANT SAFETY INSTRUCTIONS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES CAUTION SPECIAL HAZARDS OF PHOTOVOLTAIC SYSTEMS Photovoltaic systems have special characteristics that can represent special hazards: An active power source is connected. This means that, regardless to the operating mode of the inverter, there may be voltage present, either from the photovoltaic generator and/or the FREESUN. This is especially important to consider when disconnecting particular parts of the system. Very high DC voltages are present (no zero-crossing) which, in case of a fault or inappropriate use of fuses or plugs, may lead to arcing. The short-circuit current of the photovoltaic generator is dependent on the level of solar irradiation and only slightly more than the maximum operating current. A highly branched generator array may be difficult to disconnect if a fault develops (e. g. short circuit). We recommend the extra use of an external DC disconnect and fuses for disconnecting the inverter to meet the requirements of NEC 690. These components are included in the Power electronics optional disconnecting unit. Fuses should be allocated to each DC input of the FREESUN inverter as it is required by NEC 690. Power Electronics covers this requirement with the Disconnecting Unit included in HEC-UL and HEC-UL+ Series inverters. The Freesun HEC-UL+ integrates the Disconnecting Unit in the same inverter’s cabinet and the Freesun HEC-UL integrates it in an annexed cabinet. Power Electronics must be informed about the grid operator requirements. The device contains capacitors on the AC and DC sides. The discharge time of the capacitors is 5 minutes. Wait until the capacitors have been discharged before carrying out any maintenance task. IMPORTANT SAFETY INSTRUCTIONS 11 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS INTEGRATED ELECTRICAL SAFETY FEATURES Freesun inverters have the following integrated electrical safety features: Software protection controls (See section 3.3 and the Programming and Software manual). On/Off switch (Reference 1 of the figure 0.1). DC Disconnect Switch (Reference 3 of the figure 0.1). AC Circuit breaker (Reference 2 of the figure 0.1). Anti-islanding protection (See the Programming and Software Manual). LED/Front panel display when unit is operational. SYSTEM REPAIR AND TROUBLESHOOTING CAUTION Always follow established Lockout/Tagout procedures. Failure to comply can result in serious injury or death to personnel. LOCKOUT / TAGOUT Lockout/tagout standards establish procedures to protect personnel from hazardous energy sources on equipment during service and maintenance. OSHA 29 CFR, part 1910.333 gives flexibility for facility operators to design a lockout/tagout program that suits site specific needs. Lockout/tagout disables equipment producing hazardous amounts of electrical energy allowing servicing and maintenance personnel to safely perform their jobs. Employees must be trained to understand and follow the hazardous energy control procedures. Use only lockout/tagout devices authorized for particular equipment. Lockout/tagout devices must be durable, standardized and substantial. Lockout/tagout tags must identify authorized users to ensure the procedures are strictly adhered to. In order to reduce the chance of inadvertent system energization, the individual identified on the lockout/tagout notices should be the only personnel in possession of keys that can be used to unlock the lockout devices. 12 IMPORTANT SAFETY INSTRUCTIONS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS GROUND FAULT WARNING If your installation has the positive or negative pole of the photovoltaic system earth connected, the following instructions must be followed: The only point in the installation where the positive or the negative pole should be grounded is in the inverter (through the Ground Fault Detector Interrupter -GFDI- that is added to that effect). It is important to note that if there was another grounded connection (pole) elsewhere in the installation (in the panels themselves, in the String Supervisor, etc...) the protection provided by the additional GFDI would NOT be effective. Therefore, as part of scheduled maintenance, it is recommended to inspect the insulation between the grounded pole and the earth. This will prevent the GFDI from providing inappropriate protection due to uncontrolled ground leakage. MARKS, SYMBOLS AND CONTROLS ON THE INVERTER CAUTION Do not ignore safety warnings. Failure to follow all safety warnings and caution could result in equipment damage or injury to personnel. Inverter CAUTION labels are listed in the following table: TEXT LOCATION Utility interactive CAUTION - Risk of electric shock. Normally grounded conductors may be ungrounded and energized when a ground-fault is indicated. AC SWITCH Rainproof CAUTION – For Proper Circuit Connection. Connect a minimum ______ kVA rated isolating transformer between the output of the unit and the utility powerline connections. The transformer is to be an isolation type having separate primary and secondary windings. CAUTION – Risk Of Electric Shock. Both AC and DC voltage sources are terminated inside this equipment. Each circuit must be individually disconnected before servicing. When the photovoltaic array is exposed to light, it supplies a DC voltage to this equipment. Use Copper, Copper-Clad Aluminum or Aluminum conductor. WARNING – To maintain safety certification, replace only with the same type and ratings of fuse. CAUTION – Risk of electric shock from energy stored in capacitor. Stop the inverter feeding into the grid and wait 5 minutes before the AC supply disconnection. Do not remove the cover before the AC and DC disconnection. Door. Front part of each module. AC module cabinet. Door. Rear part of the door. Door. Cable connections. Close to the fuses. Front part of each module. The following symbols can be found in the inverter and used in this manual: DC current AC current Grounding electrode terminal Grounding point inside the inverter On position Off position IMPORTANT SAFETY INSTRUCTIONS 13 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The following figure shows the location of the inverter control features: Figure 0.1 Inverter controls Note: For inverters with the AC module located in their left side, the previous image is inverted. Inverter modules switch (Inverter’s ON/OFF switch) Main AC circuit breaker It allows the connection and disconnection of all the inverter modules. It allows the connection and disconnection of the AC grid. The following table represents an example of the name plate located on the inverter: Model / Modèle: FS1200CU10R0 DC INPUT / ENTRÉE DC Max. Input DC Voltage / Tension d’entrée DC Max.: 1000V Min. Voltage MPP / Tension MPP Min.: 585V Max. Voltage MPP / Tension MPP Max.: 820V Max. Input DC current / Courant d’entrée DC Max.: 2000A AC OUTPUT / SORTIE AC Nominal output voltage / Tension nominale de sortie: 390V Frequency / Fréquence: 60Hz Nominal Power / Puissance Nominale: 1200kW Max. Output Current / Courant de Sortie Max.: 1776A Ambient Temperature / Température Ambiante: 50ºC NEMA 3R MADE IN SPAIN 14 IMPORTANT SAFETY INSTRUCTIONS Disconnecting unit disconnects (Internal in HEC-UL+ Series or external in HEC-UL) It allows the connection and disconnection of the DC grid. The inside components and distribution must be configured by the user. FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 1 INTRODUCTION The Freesun HEC-UL and HEC-UL+ Series inverters are the latest advance in solar inverter technology 2 2 2 2 based on Automatic Redundant Modular Master-Slave System (ARM S ). ARM S technology creates a redundant solar inverter by automatically bypassing a faulted inverter module and restarting the inverter 2 2 making production losses a problem of the past. The Freesun Series ARM S Technology product line is made of 80kVA to 150kVA individual module inverters with powerful dual microprocessors per module, interconnected with a dedicated communication system for synchronization, and with both AC/DC protections. These building blocks are used to design inverter systems from 160kVA to 1200kVA nominal output power and with 1 to 4 MPPT windows. FREESUN accessories fulfill all the solar installations requirements such as disconnecting unit, power control interface (PCI), string monitoring (SFS), datalogger, remote inverter monitoring (FSDC), meteorology stations and additional electric protections. The Freesun HEC-UL and HEC-UL+ are the North American outdoor, UL-1741 approved versions of the HE series. This system reduces the overall photovoltaic plant wiring and transportation costs. The Power Electronics Disconnecting Unit is a cabinet that integrates DC input protection and dedicated disconnects in the Freesun inverter. The Disconnecting Unit allows HEC-UL & HEC-UL+ inverters to comply with NEC 2011 Article 690 Section III Disconnecting Means section 690.13. For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is mandatory that “Means shall be provided to disconnect all current-carrying dc conductors of a photovoltaic system from all other conductors in a building or other structure”. The Freesun HEC-UL+ integrates the Disconnecting Unit in the same inverter’s cabinet and the Freesun HEC-UL can integrate it in an annexed cabinet. STANDARD FEATURES OPTIONS Max. Efficiency PAC, nom (η) 98.6%. Multiple and user friendly monitoring solutions. AC and DC contactors in each module, and AC circuit breaker. Grid operator control by the Power Control Interface. High accuracy MPPT over a wide voltage range. Integrated Meteo Stations and video camera. Engineered for compliance with international grid connection codes. (IEEE1547, BDEW, CEI 0-16, PO12.3, …) Uninterruptible Power Supply (UPS). Automatic Redundant Modular Master-Slave System (ARM2S2). Disconnecting Unit monitoring system. Efficient cooling system with variable speed drive control. Alphanumeric Display. Internal DC fuse protections. Figure 1.1 General view of the frame 3 FREESUN HEC-UL+ Series inverter CONFIGURATION TABLE & STANDARD RATINGS 15 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 2 CONFIGURATION TABLE & STANDARD RATINGS 2.1 Configuration Table The Freesun inverter series has 4 different frame sizes with up to 2 modules per frame. HEC-UL and HEC-UL+ series inverters are specified using the following configuration table: EXAMPLE. CODE: FS 0880 C U 10 A V 2 N A 1 0160 0250 ... 1250 C P K U 06 10 A N P HEC-UL & HEC-UL+ SERIES FREESUN SERIES 160kVA 250 kVA ... 1250kVA Outdoor NEMA 3R (HEC-UL SERIES) Outdoor with input protection and disconnection cabinet NEMA 3 (HEC-UL+ SERIES) Power Skid w/ HEC-UL UL High Efficiency Inverter 600VDC 1000VDC Ungrounded system, Isolation monitoring between (+), (-) and earth Grounded PV array Negative pole (with GFDI) Grounded PV array Positive pole (with GFDI) V With AC and DC overvoltage protection R With AC and DC overvoltage protection and lightning protection FS 0880 Output Power C Inverter Location U Inverter Topology Maximum input voltage 10 A Isolating monitoring V Lightning and overvoltage protections 0 2 Maximum power point tracker range (MPPt) 1 2 6 N Auxiliary supply A Humidity Control 1 MPPT Configuration - Other ... N N R A 1 2 3 4 I … From 585-820V Transformer connection to 390 VAC From 540-820V Transformer connection to 360 VAC From 500-820V Transformer connection to 330 VAC From 330-600V Transformer connection to 208 VAC Under request [1] Not included Not included With heating Active Heating 1MPPT 2MPPT 3MPPT 4MPPT Left side – AC module Under request [1] [1] For other configuration consult with Power Electronics. 16 CONFIGURATION TABLE & STANDARD RATINGS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The Disconnecting Unit is specified using the following configuration table: EXAMPLE. FSDU Product Family CODE: FSDU 1 25 5 08 F 1 I 1 25 1 1 Disc. 25 250A 5 # Fuses per Disconnect and Pole [2] 1 1 Fuse 07 70A F 2 2 Disc. 40 400A 2 2 Fuses 08 80A P 3 3 Disc. 70 700A 3 3 Fuses 09 90A N 4 4 Disc. 12 1250A 4 5 6 7 8 9 0 4 Fuses 5 Fuses 6 Fuses 7 Fuses 8 Fuses 9 Fuses 10 Fuses 10 12 16 20 25 30 35 40 100A 125A 160A 200A 250A 300A 350A 400A # DC Disconnect Disconnects [1] Size 08 F - 1 I Fuse Rating String Configuration String Monitoring #MPPT [3] Type [4] - 1 1 MPPt E External 2 2 MPPt I Internal 3 3 MPPt 4 4 MPPt Floating Array Positive Pole grounded Negative Pole grounded M No Monitoring String current Monitoring [1] Maximum 3 units for 1250A disconnects. [2] Maximum 5 fuses per pole for floating array PV plant configurations. [3] Consult availability. In grounded PV installations the inverter can only be configured with one MPPt. [4] External in HEC-UL or internal in HEC-UL+. 2.2 Standard Ratings The following table summarizes the available Freesun inverters based on frame size. FRAME 0 1 REFERENCE Max. PV Power (PPV) FS0160U6 FS0250U2 FS0280U1 FS0300U0 FS0240U6 FS0380U2 FS0420U1 FS0450U0 FS0320U6 FS0500U2 FS0560U1 FS0600U0 FS0400U6 192kWp 300kWp 334kWp 360kWp INPUT DC Voltage Range MPPt (VDC) [2] 330V-600V 500V-820V 540V-820V 585V-820V 288kWp 450kWp 500kWp 540kWp 384kWp 600kWp 667kWp 720kWp 480kWp 750kWp FS0630U2 FS0700U1 2 FS0751U0 FS0480U6 FS0750U2 FS0830U1 FS0900U0 3 FS0560U6 FS0880U2 FS0970U1 FS1050U0 FS0640U6 FS1000U2 FS1110U1 FS1200U0 FS1250U0 500A 500A 500A 500A Nominal AC Output Power (PAC) [1] 160kVA 250kVA 280kVA 300kVA OUTPUT Operating Grid Voltage ±10% (VAC) 208V 330V 360V 390V Nominal AC Current (IAC, nom) 444A 438A 444A 444A 330V-600V 500V-820V 540V-820V 585V-820V 330V-600V 500V-820V 540V-820V 585V-820V 330V-600V 500V-820V 750A 750A 750A 750A 1000A 1000A 1000A 1000A 1250A 1250A 240kVA 380kVA 420kVA 450kVA 320kVA 500kVA 560kVA 600kVA 400kVA 630kVA 208V 330V 360V 390V 208V 330V 360V 390V 208V 330V 666A 656A 667A 666A 888A 875A 889A 888A 1250A 1230A 834kWp 900kWp 540V-820V 585V-820V 1250A 1250A 700kVA 750kVA 360V 390V 1111A 1110A 576kWp 900kWp 330V-600V 500V-820V 1500A 1500A 480kVA 750kVA 208V 330V 1332A 1313A 1001kWp 1080kWp 672kWp 1050kWp 1168kWp 1260kWp 768kWp 1200kWp 1334kWp 1440kWp 1500kWp 540V-820V 585V-820V 330V-600V 500V-820V 540V-820V 585V-820V 330V-600V 500V-820V 540V-820V 585V-820V 585V-820V 1500A 1500A 1750A 1750A 1750A 1750A 2000A 2000A 2000A 2000A 2000A 830kVA 900kVA 565kVA 880kVA 970kVA 1050kVA 640kVA 1000kVA 1110kVA 1200kVA 1250kVA 360V 390V 208V 330V 360V 390V 208V 330V 360V 390V 390V 1333A 1332A 1554A 1532A 1555A 1554A 1776A 1750A 1778A 1776A 1850A Max. DC current (A) CONFIGURATION TABLE & STANDARD RATINGS 17 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS Freesun Rated Available Power based on AC Output Voltage and Number of Power Modules: MPPt Range (VDC) [2] 330V-600V 500V-820V 540V-820V 585V-820V 2 160 250 280 300 3 240 380 420 450 4 320 500 560 600 5 400 630 700 750 6 480 750 830 900 7 560 880 970 1050 8 640 1000 1110 1200 / 1250 AC Output Voltage 208Vac 330Vac 360Vac 390Vac [1] Values at 50ºC. [2] Values at 1.00·Vac nom and cos Φ= 1. 18 CONFIGURATION TABLE & STANDARD RATINGS AC Output Power (kVA) [1] Nº Modules FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 3 TECHNICAL CHARACTERISTICS 3.1 Environmental Specifications ENVIRONMENT The following table summarizes the environmental specifications for the Freesun HEC-UL and HEC-UL+ inverter series. Degree of protection Permissible Ambient Temperature [1] Relative Humidity Max. Altitude (above sea level) [1] Noise level [2] Pollution degree Painting NEMA 3R -4ºF to +122ºF (-20ºC to +50ºC) 4% to 100% 1000m; >1000m power derating 1% Sn (kVA) per 100m < 70 dBA PD3 RAL 7035 [1] Other characteristics consult with Power Electronics. [2] Sound pressure level at a distance of 1m from the rear part. 3.2 Control Interface Specifications CONTROL INTERFACE The following table summarizes the control and communication specifications for the Freesun HEC-UL and HEC-UL+ inverter series. Interface Communication Analogue Inputs Digital Outputs Alphanumeric display RS232 / RS485 / USB / Ethernet, (Modbus RTU Protocol, Modbus TCP/IP) 1 programmable and differential inputs; (0-20mA or ± 10mV to ± 10V) and PT100 2 electrically-isolated programmable switched relays (250VAC, 8A or 30 VDC, 8A) 3.3 Undervoltage, Overvoltage and Frequency Ride Through Characteristics PROTEC TIONS The following table summarizes the voltage and frequency ride through capabilities of the Freesun HECUL and HEC-UL+ inverter series. SW Low Voltage SW High Voltage SW Low Frequency SW High Frequency Fast: 50%·Vn (0.1s) and Slow: 88%·Vn (2s) Fast: 120%·Vn (0.1s) and Slow: 110%·Vn (1s) Fast: 57.00Hz (0.1s) and Slow: 58.00Hz (20s) Fast: 60.50Hz (0.1s) Note: The values shown in the previous table are set as standard in the inverter and are in accordance with the regulation IEEE 1547. Modifying these values could result in IEEE1547 regulation noncompliance. This cannot happen without the utility and local authorities consent. TECHNICAL CHARACTERISTICS 19 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 3.4 Freesun 390Vac, 1000Vdc, 300kVA to 1250kVA 390VAC - MPPt range 585Vdc-820Vdc 3 4 5 6 7 FREESUN HE 0300_U 0450_U 0600_U 0751_U 0900_U 1050_U 300 330 444 450 495 666 600 660 888 OUTPUT Frame 0 2 Nominal AC Output Power(kVA) Rated Output Power (+10%) (kVA) [2] Nominal Output AC Current (A) Operating Grid Voltage(VAC) Operating Range, Grid Frequency Voltage Ripple, PV Voltage Current Harmonic Distortion (THDi) Power Factor (cosine phi) Power Curtailment (kVA) INPUT Number of Modules DC Voltage Range MPPT (VDC) [3] Max. permissible DC voltage Max. continuous DC current (A) Max. short circuit DC current (A) [1] EFFICIENCY & AUX. SUPPLY Max. Efficiency PAC, nom (η) Weighted CEC Efficiency (η) Max. Standby Consumption (Pnight) CABINET HEC-UL+ Dimensions [WxDxH] [4] mm HEC-UL Dimensions [WxDxH] [4] mm inches inches HEC-UL with external mm Disconnecting Unit Dimensions inches [WxDxH] [4] [4] HEC-UL+ Weight (kg/lbs) HEC-UL Weight (kg/lbs) [4] HEC-UL with DU Weight (kg/lbs) [4] Air Flow Type of ventilation 1000A 1300A 98.6% 98.0% 98.6% 98.0% 98.6% 98.0% 920W PROTECTIONS 8 1200_U 1250_U 585V-820V 1000V 1250A 1500A 1625A 1950A 1750A 2275A 98.6% 98.6% 98.6% 98.6% 98.0% 98.0% 98.0% 98.0% < approx. 40W per module Built-in internal transformer as standard (Optional external 3x208Vac power supply and UPS backup system) 1380W 1840W 2300W 2760W 3220W 3680W 1250 1350 1850 2000A 2600A 98.6% 98.0% 3680W 2900 x 1020 x 3900 x 1020 x 2400 4900 x 1020 x 2400 5900 x 1020 x 2400 2400 11411/64 x 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 2329/32 x 405/32 x 9431/64 405/32 x 9431/64 1900 x 1020 x 2900 x 1020 x 2400 3900 x 1020 x 2400 4900 x 1020 x 2400 2400 51/64 5/32 74 x 40 11411/64 x 405/32 x 9431/64 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 x 9431/64 3200 x 1020 x 4200 x 1020 x 2400 5200 x 1020 x 2400 6200 x 1020 x 2400 2400 5/32 126 x 40 x 16523/64 x 405/32 x 9431/64 20423/32 x 405/32 x 9431/64 2443/32 x 405/32 x 9431/64 9431/64 2470/3450 3220/7100 3530/7780 4290/9460 4600/10140 5340/11770 5650/12460 1720/3800 2470/3450 2780/6130 3540/7800 3850/8500 4590/10120 4900/10800 2490/5490 3240/7140 3550/7830 5310/11710 4620/10190 5360/11820 5670/12500 Intake through rear lower part blown out through upper side Forced Heating Resistors Emergency Stop General AC Circuit Breaker AC Contactor AC Circuit Breaker DC Contactor DC Fuses General DC Protection Overvoltage Protection Protection class Lightning Protections Safety Utility Interconnect Grid support (optional) Floating PV array: Isolation Monitoring per MPP Grounded PV array (Positive pole and negative pole): GFDI protection Standard Optional Standard; External Operation standard in each module standard in each module standard in each module standard in each module Optional External Disconnecting Unit Cabinet (DC fuse protection and no load disconnect with external operating handle) DC and AC Inverter sides (Type 4) and Auxiliary Supply type 2- Internal Standard Class I Optional (Integrated in the inverter) UL 1741; CSA 22.2 No.107.1-01 IEEE 1547 LVRT, Active & Reactive Power Control, etc. [5] [1] Values at 50ºC. [2] Maximum ambient temperature 40ºC. [3] Values at 1.00·Vac nom and cos Φ= 1. [4] These values can be changed depending on the order. Consult Power Electronics for more details. [5] Consult Power Electronics for the full list of grid support capabilities. 20 Frame 3 750 900 1050 1200 825 990 1155 1320 1110 1332 1554 1776 390Vac (± 10%) 60Hz < 3% < 3% at nominal power 0.0 leading … 0.0 lagging / 0.90 leading … 0.90 lagging (adjustable) 0...110%/0.1% Steps 750A 975A Ground Fault Protection REGULATIONS Frame 2 500A 650A Control Power Supply Avg. Power Consumption Frame 1 TECHNICAL CHARACTERISTICS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 3.5 Freesun 360Vac, 1000Vdc, 280kVA to 1110kVA 360VAC - MPPt range 540Vdc-820Vdc 3 4 5 6 7 8 FREESUN HE 0280_U 0420_U 0560_U 0701_U 0830_U 0970_U 1110_U 280 310 444 420 460 667 560 610 889 Nominal AC Output Power(kVA) [1] Rated Output Power (+10%) (kVA) [2] Nominal Output AC Current (A) Operating Grid Voltage(VAC) Operating Range, Grid Frequency Voltage Ripple, PV Voltage Current Harmonic Distortion (THDi) Power Factor (cosine phi) Power Curtailment (kVA) DC Voltage Range MPPT (VDC)[3] Max. permissible DC voltage Max. continuous DC current (A) Max. short circuit DC current (A) CABINET EFFICIENCY & AUX. SUPPLY OUTPUT Frame 0 2 INPUT Number of Modules Max. Efficiency PAC, nom (η) Weighted CEC Efficiency (η) Max. Standby Consumption (Pnight) PROTECTIONS 98.6% 98.0% Control Power Supply 920W Avg. Power Consumption HEC-UL+ Dimensions [WxDxH] [4] mm HEC-UL Dimensions [WxDxH] [4] mm inches inches HEC-UL with external mm Disconnecting Unit Dimensions inches [WxDxH] [4] [4] HEC-UL+ Weight (kg/lbs) HEC-UL Weight (kg/lbs) [4] HEC-UL with DU Weight (kg/lbs) [4] Air Flow Type of ventilation Ground Fault Protection Heating Resistors Emergency Stop General AC Circuit Breaker AC Contactor AC Circuit Breaker DC Contactor DC Fuses General DC Protection Overvoltage Protection Protection class Lightning Protections REGULATIONS 500A 650A Safety Utility Interconnect Grid support (optional) 2900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 1900 x 1020 x 2400 7451/64 x 405/32 x 9431/64 3200 x 1020 x 2400 126 x 405/32 x 9431/64 2470/3450 1720/3800 2490/5490 Frame 1 Frame 2 Frame 3 700 830 970 760 920 1070 1111 1333 1555 360Vac (± 10%) 60Hz < 3% < 3% at nominal power 0.0 leading … 0.0 lagging / 0.90 leading … 0.90 lagging (adjustable) 0...110%/0.1% Steps 750A 975A 1000A 1300A 540V-820V 1000V 1250A 1625A 1500A 1950A 1750A 2275A 1110 1220 1778 2000A 2600A 98.6% 98.0% 98.6% 98.6% 98.0% 98.0% < approx. 40W per module Built-in internal transformer as standard (Optional external 3x208Vac power supply and UPS backup system) 1380W 1840W 2300W 2760W 3220W 3680W 3900 x 1020 x 2400 4900 x 1020 x 2400 5900 x 1020 x 2400 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 2329/32 x 405/32 x 9431/64 2900 x 1020 x 2400 3900 x 1020 x 2400 4900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 4200 x 1020 x 2400 5200 x 1020 x 2400 6200 x 1020 x 2400 16523/64 x 405/32 x 9431/64 20423/32 x 405/32 x 9431/64 2443/32 x 405/32 x 9431/64 3220/7100 3530/7780 4290/9460 4600/10140 5340/11770 2470/3450 2780/6130 3540/7800 3850/8500 4590/10120 3240/7140 3550/7830 5310/11710 4620/10190 5360/11820 Intake through rear lower part blown out through upper side Forced 5650/12460 4900/10800 5670/12500 Floating PV array: Isolation Monitoring per MPP Grounded PV array (Positive pole and negative pole): GFDI protection Standard Optional Standard; External Operation standard in each module standard in each module standard in each module standard in each module Optional External Disconnecting Unit Cabinet (DC fuse protection and no load disconnect with external operating handle) DC and AC Inverter sides (Type 4) and Auxiliary Supply type 2- Internal Standard Class I Optional (Integrated in the inverter) UL 1741; CSA 22.2 No.107.1-01 IEEE 1547 LVRT, Active & Reactive Power Control, etc. [5] [1] Values at 50ºC. [2] Maximum ambient temperature 40ºC. [3] Values at 1.00·Vac nom and cos Φ= 1. [4] These values can be changed depending on the order. Consult Power Electronics for more details. [5] Consult Power Electronics for the full list of grid support capabilities. TECHNICAL CHARACTERISTICS 21 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 3.6 Freesun 330Vac, 1000Vdc, 250kVA to 1000kVA 330VAC - MPPt range 500Vdc-820Vdc 3 4 5 6 7 8 FREESUN HE 0250_U 0380_U 0501_U 0630_U 0750_U 0880_U 1001_U 250 280 438 380 410 656 500 550 875 OUTPUT Frame 0 2 Nominal AC Output Power(kVA) [1] Rated Output Power (+10%) (kVA) [2] Nominal Output AC Current (A) Operating Grid Voltage(VAC) Operating Range, Grid Frequency Voltage Ripple, PV Voltage Current Harmonic Distortion (THDi) Power Factor (cosine phi) Power Curtailment (kVA) INPUT Number of Modules DC Voltage Range MPPT (VDC)[3] Max. permissible DC voltage Max. continuous DC current (A) Max. short circuit DC current (A) EFFICIENCY & AUX. SUPPLY Max. Efficiency PAC, nom (η) Weighted CEC Efficiency (η) Max. Standby Consumption (Pnight) 500A 650A 98.6% 98.0% Control Power Supply 920W CABINET Avg. Power Consumption HEC-UL+ Dimensions [WxDxH] [4] mm HEC-UL Dimensions [WxDxH] [4] mm inches inches HEC-UL with external mm Disconnecting Unit Dimensions inches [WxDxH] [4] HEC-UL+ Weight (kg/lbs) [4] HEC-UL Weight (kg/lbs) [4] HEC-UL with DU Weight (kg/lbs) [4] Air Flow Type of ventilation 2900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 1900 x 1020 x 2400 7451/64 x 405/32 x 9431/64 3200 x 1020 x 2400 126 x 405/32 x 9431/64 2470/3450 1720/3800 2490/5490 Ground Fault Protection PROTECTIONS Heating Resistors Emergency Stop General AC Circuit Breaker AC Contactor AC Circuit Breaker DC Contactor DC Fuses General DC Protection Overvoltage Protection Protection class Lightning Protections REGULATIONS Safety Utility Interconnect Grid support (optional) Frame 1 Frame 2 630 750 880 690 830 960 1230 1313 1532 330Vac (± 10%) 60Hz < 3% < 3% at nominal power 0.0 leading … 0.0 lagging / 0.90 leading … 0.90 lagging (adjustable) 0...110%/0.1% Steps 750A 975A 1000A 1300A TECHNICAL CHARACTERISTICS 500V-820V 1000V 1250A 1625A 1500A 1950A 1750A 2275A 1000 1100 1750 2000A 2600A 98.6% 98.0% 98.6% 98.6% 98.0% 98.0% < approx. 40W per module Built-in internal transformer as standard (Optional external 3x208Vac power supply and UPS backup system) 1380W 1840W 2300W 2760W 3220W 3680W 3900 x 1020 x 2400 4900 x 1020 x 2400 5900 x 1020 x 2400 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 2329/32 x 405/32 x 9431/64 2900 x 1020 x 2400 3900 x 1020 x 2400 4900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 4200 x 1020 x 2400 5200 x 1020 x 2400 6200 x 1020 x 2400 16523/64 x 405/32 x 9431/64 20423/32 x 405/32 x 9431/64 2443/32 x 405/32 x 9431/64 3220/7100 3530/7780 4290/9460 4600/10140 5340/11770 2470/3450 2780/6130 3540/7800 3850/8500 4590/10120 3240/7140 3550/7830 5310/11710 4620/10190 5360/11820 Intake through rear lower part blown out through upper side Forced Floating PV array: Isolation Monitoring per MPP Grounded PV array (Positive pole and negative pole): GFDI protection Standard Optional Standard; External Operating Handle standard in each module standard in each module standard in each module standard in each module Optional External Disconnecting Unit Cabinet (DC fuse protection and no load disconnect with external operating handle) DC and AC Inverter sides (Type 4) and Auxiliary Supply type 2- Internal Standard Class I Optional (Integrated in the inverter) UL 1741; CSA 22.2 No.107.1-01 IEEE 1547 LVRT, Active & Reactive Power Control, etc. [5] [1] Values at 50ºC. [2] Maximum ambient temperature 40ºC. [3] Values at 1.00·Vac nom and cos Φ= 1. [4] These values can be changed depending on the order. Consult Power Electronics for more details. [5] Consult Power Electronics for the full list of grid support capabilities. 22 Frame 3 5650/12460 4900/10800 5670/12500 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 3.7 Freesun 208Vac, 600Vdc, 160kVA to 640kVA 208VAC - MPPt range 330Vdc-600Vdc 3 4 5 6 7 8 FREESUN HE 0160_U 0240_U 0320_U 0400_U 0480_U 0560_U 0640_U 160 176 444 240 264 666 320 352 888 Nominal AC Output Power(kVA) [1] Rated Output Power (+10%) (kVA) [2] Nominal Output AC Current (A) Operating Grid Voltage(VAC) Operating Range, Grid Frequency Voltage Ripple, PV Voltage Current Harmonic Distortion (THDi) Power Factor (cosine phi) Power Curtailment (kVA) DC Voltage Range MPPT (VDC)[3] Max. permissible DC voltage Max. continuous DC current (A) Max. short circuit DC current (A) CABINET EFFICIENCY & AUX. SUPPLY OUTPUT Frame 0 2 INPUT Number of Modules Max. Efficiency PAC, nom (η) Weighted CEC Efficiency (η) Max. Standby Consumption (Pnight) PROTECTIONS 98.6% 98.0% Control Power Supply 920W Avg. Power Consumption HEC-UL+ Dimensions [WxDxH] [4] mm HEC-UL Dimensions [WxDxH] [4] mm inches inches HEC-UL with external mm Disconnecting Unit Dimensions inches [WxDxH] [4] [4] HEC-UL+ Weight (kg/lbs) HEC-UL Weight (kg/lbs) [4] HEC-UL with DU Weight (kg/lbs) [4] Air Flow Type of ventilation Ground Fault Protection Heating Resistors Emergency Stop General AC Circuit Breaker AC Contactor AC Circuit Breaker DC Contactor DC Fuses General DC Protection Overvoltage Protection Protection class Lightning Protections REGULATIONS 500A 650A Safety Utility Interconnect Grid support (optional) 2900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 1900 x 1020 x 2400 7451/64 x 405/32 x 9431/64 3200 x 1020 x 2400 126 x 405/32 x 9431/64 2470/3450 1720/3800 2490/5490 Frame 1 Frame 2 Frame 3 400 480 560 440 528 616 1250 1332 1554 208VAC (± 10%) 60Hz < 3% < 3% at nominal power 0.0 leading … 0.0 lagging / 0.90 leading … 0.90 lagging (adjustable) 0...110%/0.1% Steps 750A 975A 1000A 1300A 330V-600V 600V 1250A 1625A 1500A 1950A 1750A 2275A 640 704 1776 2000A 2600A 98.6% 98.0% 98.6% 98.6% 98.0% 98.0% < approx. 40W per module Built-in internal transformer as standard (Optional external 3x208Vac power supply and UPS backup system) 1380W 1840W 2300W 2760W 3220W 3680W 3900 x 1020 x 2400 4900 x 1020 x 2400 5900 x 1020 x 2400 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 2329/32 x 405/32 x 9431/64 2900 x 1020 x 2400 3900 x 1020 x 2400 4900 x 1020 x 2400 11411/64 x 405/32 x 9431/64 15335/64 x 405/32 x 9431/64 19229/32 x 405/32 x 9431/64 4200 x 1020 x 2400 5200 x 1020 x 2400 6200 x 1020 x 2400 16523/64 x 405/32 x 9431/64 20423/32 x 405/32 x 9431/64 2443/32 x 405/32 x 9431/64 3220/7100 3530/7780 4290/9460 4600/10140 5340/11770 2470/3450 2780/6130 3540/7800 3850/8500 4590/10120 3240/7140 3550/7830 5310/11710 4620/10190 5360/11820 Intake through rear lower part blown out through upper side Forced 5650/12460 4900/10800 5670/12500 Floating PV array: Isolation Monitoring per MPP Grounded PV array (Positive pole and negative pole): GFDI protection Standard Optional Standard; External Operation standard in each module standard in each module standard in each module standard in each module Optional External Disconnecting Unit Cabinet (DC fuse protection and no load disconnect with external operating handle) DC and AC Inverter sides (Type 4) and Auxiliary Supply type 2- Internal Standard Class I Optional (Integrated in the inverter) UL 1741; CSA 22.2 No.107.1-01 IEEE 1547 LVRT, Active & Reactive Power Control, etc. [5] [1] Values at 50ºC. [2] Maximum ambient temperature 40ºC. [3] Values at 1.00·Vac nom and cos Φ= 1. [4] These values can be changed depending on the order. Consult Power Electronics for more details. [5] Consult Power Electronics for the full list of grid support capabilities. TECHNICAL CHARACTERISTICS 23 FREESUN HEC-UL & HEC-UL+ SERIES 3.8 Operational Diagram Figure 3.1 Operational Diagram HEC-UL & HEC-UL+ Series 24 TECHNICAL CHARACTERISTICS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 4 DIMENSIONS AND WEIGHTS The inverter is a heavy cabinet unit. Select the transport method adequately. Follow the transport recommendations of this manual and ensure the compliance with the safety regional regulations. Danger of tipping during transport. The cabinet must always be transported upright. 4.1 HEC-UL+ Series The HEC-UL+ series has the input cabinet integrated in the left side of the inverter. The dimensions and weight are defined in the following table: INVERTER FRAMES 0 1 2 3 REFERENCE FS0160PU6, FS0250PU2, FS0280PU1, FS0300PU0 FS0400PU6, FS0630PU2, FS0700PU1, FS0751PU0 FS0480PU6, FS0750PU2, FS0830PU1, FS0900PU0 FS0400PU6, FS0630PU2, FS0700PU1, FS0751PU0 FS0480PU6, FS0750PU2, FS0830PU1, FS0900PU0 FS0560PU6, FS0880PU2, FS0970PU1, FS1050PU0 FS0640PU6, FS1000PU2, FS1110PU1, FS1200PU0 DIMENSIONS in mm / in WIDTH DEPTH HEIGHT (W) (D) (H) 2900/11411/64 1020/405/32 2400/9431/64 3900/15335/64 1020/405/32 2400/9431/64 WEIGHT (kg/lbs) 2470/3450 3220/7100 3530/7780 4290/9460 4900/19229/32 1020/405/32 2400/9431/64 4600/10140 5340/11770 5900/2329/32 1020/405/32 2400/9431/64 5650/12460 Figure 4.1 HEC-UL+ Frame 3 Note: For inverters with the AC module located on the left side, the previous image is inverted. DIMENSIONS AND WEIGHTS 25 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 4.2 HEC-UL Series The HEC-UL series don’t integrate an input cabinet. The dimensions and weight are defined in the following table: INVERTER FRAMES 0 1 2 3 DIMENSIONS in mm / in WIDTH DEPTH HEIGHT (W) (D) (H) REFERENCE FS0160CU6, FS0250CU2, FS0280CU1, FS0300CU0 FS0240CU6, FS0380CU2, FS0420CU1, FS0450CU0 FS0320CU6, FS0500CU2, FS0560CU1, FS0600CU0 FS0400CU6, FS0630CU2, FS0700CU1, FS0751CU0 FS0480CU6, FS0750CU2, FS0830CU1, FS0900CU0 FS0560CU6, FS0880CU2, FS0970CU1, FS1050CU0 FS0640CU6, FS1000CU2, FS1110CU1, FS1200CU0 1900/7451/64 1020/405/32 2400/9431/64 2900/11411/64 1020/405/32 2400/9431/64 WEIGHT (kg/lbs) 1720/3800 2470/3450 2780/6130 3540/7800 3900/15335/64 1020/405/32 2400/9431/64 3850/8500 4590/10120 4900/19229/32 1020/405/32 2400/9431/64 4900/10800 Figure 4.2 HEC-UL Frame 3 Note: For inverters with the AC module located on the left side, the previous image is inverted. 26 DIMENSIONS AND WEIGHTS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 4.3 HEC-UL Series with External Disconnecting Unit The HEC-UL Series has a separate cabinet for the input cabinet. The dimensions and weight are defined in the following table: INVERTER FRAMES 0 1 2 3 REFERENCE DIMENSIONS in mm / in WIDTH DEPTH HEIGHT (D) (H) W1 W2 FS0160CU6+FSDUE, FS0250CU2+FSDUE, 3200/126 FS0280CU1+FSDUE, FS0300CU0+FSDUE FS0240CU6+FSDUE, FS0380CU2+FSDUE, FS0420CU1+FSDUE, FS0450CU0+FSDUE 4200/16523/64 FS0320CU6+FSDUE, FS0500CU2+FSDUE, FS0560CU1+FSDUE, FS0600CU0+FSDUE FS0400CU6+FSDUE, FS0630CU2+FSDUE, FS0700CU1+FSDUE, FS0751CU0+FSDUE 5200/20423/32 FS0480CU6+FSDUE, FS0750CU2+FSDUE, FS0830CU1+FSDUE, FS0900CU0+FSDUE FS0560CU6+FSDUE, FS0880CU2+FSDUE, FS0970CU1+FSDUE, FS1050CU0+FSDUE 6200/2443/32 FS0640CU6+FSDUE, FS1000CU2+FSDUE, FS1110CU1+FSDUE, FS1200CU0+FSDUE 1135/4411/16 1020/405/32 2400/9431/64 WEIGHT (kg/lbs) 2490/5490 3240/7140 1135/4411/16 1020/405/32 2400/9431/64 3550/7830 5310/11710 1135/4411/16 1020/405/32 2400/9431/64 4620/10190 5360/11820 1135/4411/16 1020/405/32 2400/9431/64 5670/12500 Figure 4.3 HEC-UL Frame 3 with external Disconnecting Unit Note: For inverters with the AC module located on the left side, the previous image is inverted. DIMENSIONS AND WEIGHTS 27 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 5 HANDLING, TRANSPORTATION AND INSTALLATION CAUTION Carefully read the following transportation and installation instructions. Failure to follow transportation and installation instructions could result in equipment damage or injury to personnel. 5.1 Delivery and Storage The Freesun Inverters are carefully tested and packed for shipment. In the event of transport damage, please ensure that you notify the transport agency and Power Electronics (International +34 96 136 65 57) or your nearest agent, within 24hrs from receipt of the goods. Make sure model and serial number of the Inverter are the same on the delivery note and unit. The inverter should be stored in a location that is protected from direct sun and excess moist. The storage temperature rating for the inverter is -25°C and +55°C. 5.2 Handling and Transportation Only the transport methods described in this document or in the delivery notes are approved. Follow the transport requirements here described. Any other transport method or system could damage the unit. The inverter and the Disconnecting Unit cabinets are designed to be lifted with a crane. Power Electronics provides eight lifting eye bolts for the inverter. Furthermore, in the event of having an HEC-UL inverter, Power Electronics provides four lifting eye bolts for the Disconnecting unit. These lifting eye bolts must be installed in the top part of the inverter as shown in the next figures. Make sure the lifting capacity of all the equipment is greater than the cabinets’ weight. A crane is required for the onsite unloading of the inverter. It is the customer’s responsibility to ensure unimpeded access to the final place or location, taking into account the movement and handling of these vehicles in the field where the unloading is going to take place. Additionally the crane must meet the following requirements. The crane must be independent from the truck. The crane must be equipped with an eight-point chain or two four-point chains (one four-point chain for the Disconnecting Unit). The crane and the transport items must have a greater load capacity than the inverter weight. Customer must provide an 8 points or two 4 points lifting chains and rig the inverter as it is shown in the next figure (one four-point chain for the Disconnecting Unit). 28 HANDLING, TRANSPORTATION AND INSTALLATION FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The following scheme illustrates the transport recommendations of the inverter cabinet. Figure 5.1 Inverter crane transport recommendations [mm/in] Note: For inverters with the AC module located on the left side, the previous image is inverted. The inverter’s center of gravity is located as the following coordinates from the left bottom side: INVERTER HEC-UL Frame 3 Ix (mm/in) 2495 / 9815/64 Iy (mm/in) 1286 / 505/8 Iz (mm/in) 435 / 171/8 HANDLING, TRANSPORTATION AND INSTALLATION 29 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The following scheme illustrates the transport recommendations of the Disconnecting Unit cabinet for HEC-UL inverters. Figure 5.2 Disconnecting Unit crane transport recommendations The Disconnecting Unit center of gravity is located as the following coordinates from the left bottom side: Ix (mm/in) 566 / 229/32 30 Iy (mm/in) 1266 / 4927/32 HANDLING, TRANSPORTATION AND INSTALLATION Iz (mm/in) 423 / 1621/32 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS During transportation it is mandatory to manipulate it carefully and as close to the floor as possible. CAUTION If the maximum tonnage of cranes cannot meet the requirement (refer to section 4), it could cause damage to the equipment and lead to injury to people. Avoid brusque movements and shocks during lifting. Pause before lowering it to the floor and then slowly lower it on the floor to avoid any shock. Otherwise, the equipment can be damaged. Once the inverter is placed on the foundations, the installer must secure the inverter to the concrete using a M14 (7/16) hot dip galvanized bolts of at least 10.9 quality, applying a torque of 73.75lb/ft (100Nm). There is an L shape in each point of support that fixes the inverter to the floor. User must use a bolt per point of support. Figure 5.3 Floor fixation [mm/in] 5.3 Installation requirements The inverter has been designed with an isolated cabinet that ensures the optimum outdoor performance under the ambient conditions specified. Nevertheless it is recommended for locations with an ambient 2 temperature higher than 40ºC and an incident radiation higher than 1100 W/m to orient the inverter front part facing north and use a canopy to keep direct sun off the unit. For an adequate inspection and cooling capacity the following minimum distance should be considered. Figure 5.4 Inverter clearances [mm/in] The inverter needs no side clearance but it is necessary to leave a walkway in the rear part of it. HANDLING, TRANSPORTATION AND INSTALLATION 31 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 5.4 Suggested Foundations The foundation must guarantee a solid, plain and leveled surface to the inverter, a minimum working space around it and a smoothly AC and DC cable access. The foundations should provide at least the following specifications. The foundation and soil should stand at least the inverter weight. The concrete surface should be honed to ensure a correct positioning of the inverter. The surface should avoid water pools and favor rain water evacuation with a slope below 1%. The foundations must guarantee enough space for maintenance equipment and personnel. The foundations must have a 150mm step. LETTER Distance INVERTER HEC-UL+ HEC-UL mm in B 2900 11411/64 C 500 1911/16 FRAME A - DIMENSIONS (mm/in) 3 2 1 0 3 2 1 0 6900 / 27121/32 5900 / 2329/32 4900 / 19229/32 3900 / 15335/64 7200 / 28315/32 6200 / 2443/32 5200 / 20423/32 4200 / 16523/64 D 1100 435/16 E 1400 551/8 F 1000 393/8 G 1300 513/16 FOOTINGS Nº DIMENSIONS LOAD (kg) 1&7 2 to 6 890 x 150 890 x 120 850 850 Figure 4.6 HEC-UL foundations [mm] The cables must be routed smoothly into the inverter from below, where the DC and AC busbars are allocated. The input and output dimensions are described in point “6. Wiring access and connections”. To ensure neither animals, insects, dust nor moisture could enter through the canalization, it is recommended to fill the canalization with polyurethane foam. 32 HANDLING, TRANSPORTATION AND INSTALLATION FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 5.5 Disconnecting Unit Assembly for HEC-UL Inverters The Disconnecting Unit cabinet of the HEC-UL inverter is delivered separately. The DC power connections between the DC disconnecting unit and the inverter cabinet must be done during installation. The following table indicates the number of components that are contained in the union: Component Mating flanges for busbar transits (HxWxD mm/in)=(240/929/64 x 730/2847/64 x 200/77/8) Positive connection busbar Negative connection busbar M8 (1/4) screws M8 (1/4) bolts M8 (1/4) spring washers M8 (1/4) fender washers M6 (12) screws M6 (12) Neoprene washers Units Piece of the figure 5.4 1 1 1 1 16 16 16 32 22 22 2 3 The following figure identifies all the pieces described in the previous table: Figure 5.5 Assembly kit Follow the steps in this section to connect the Disconnecting Unit to the inverter cabinet. Unscrew the 10 M6 (12) screws and neoprene washers of the cabinets’ removable panels in the union sides; keep the screws and the fender washers in a safe place for future use. Apply a conductive paste in the union of the connection busbars. Use the M8 (1/4) screws, bolts, spring washers and fender washers to fix the busbars (piece 2 of the figure 5.4) in one of the two cabinets that will be joined. Use the removed M6 (12) screws and neoprene washers to fix the mating flange (piece 1 of the figure 5.4). The following figure shows the result of the previous steps. Figure 5.6 Cabinet assembly kit connections HANDLING, TRANSPORTATION AND INSTALLATION 33 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS Next, join the cabinets and screw the M8 screws, bolts, spring washers and fender washers to fix the connection busbars in the other cabinet. The following figure illustrates this action: Figure 5.7 Connection busbars fixation Note: For inverters with the AC module located on the left side, the previous image is inverted. Finally, fix the mating flange to the other cabinet using the remaining M6 (12) screws. The following figure illustrates this action: Figure 5.8 Mating flange connection 5.6 Cooling System The inverter has an independent IGBT variable speed cooling system1. The air enters through the inlet hood located in the bottom part and exits through the outlet hood placed at the top part of the inverter thanks to the cabinets’ fans. Figure 5.9 Cooling system 1 34 Check software and programming manual to configure the cooling system. HANDLING, TRANSPORTATION AND INSTALLATION POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES Each internal module of the inverter requires 1400m³/h of fresh air. For example, an inverter with 4 modules requires 5600m³/h). Check the technical characteristics of the selected inverter to determine the number of modules. If the inverter is installed in a metal or concrete cabinet, ensure that the enclosure is equipped with adequate exhaust air vents and inlet dampers. The HVA system must be designed to ensure the ambient ratings of the inverters with sufficient capacity to dissipate the internal heat generated. The inverter module electronics and the AC module are cooled through a cooling system installed in each electronics compartment that moves the fresh and clean air from the bottom, through the dust filters and fans, to the top dust filters and exhaust fans. Each fan presents a cooling capacity of 75m³/h. The dust filters located in the inlet and outlet grating of the cabinet must be cleaned or replaced as part of the regularly scheduled maintenance. The inverter can integrate two types of grating. The frequency of maintenance should be according to the environmental site conditions. To replace the type 1 inlet and outlet filters, follow the next steps: Pull from the top right corner to unclip the grating. Remove and clean/replace the filter. Place again the filter. Clip again the grating pressing smoothly. Figure 5.10 Filter clean/replacement To replace the type 2 inlet and outlet filters, follow the next steps: Unscrew the three bolts that fix the grating to the electronics module. Unscrew the two bolts that fix both parts of the grating. Remove and clean/replace the filter. Place again the filter. Screw again the grating parts. Screw again the grating to the electronics module. Figure 5.11 Filter clean/replacement Maintain clearance distances around the inverter to ensure adequate cooling capacity for the inverter. Install the inverter in such a way that it is not possible for intake and exhaust air from the inverter to be drawn into the air intake and exhaust of other devices (e.g., the transformer or other inverter). HANDLING, TRANSPORTATION AND INSTALLATION 35 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 5.7 Noise Levels The Freesun inverter series are designed to be installed in an industrial environment. The inverter noise level is below 70dBA2 at a distance of 1m from the rear part. Noise attenuation occurs as distance from the source increases. 2 It is possible to reduce the sound level reducing the fan speed, only when the inverter is operating with lower ambient conditions. For additional information consult Software and Programming manual. 36 HANDLING, TRANSPORTATION AND INSTALLATION FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6 WIRING ACCESS AND CONNECTIONS All cable connections to the Freesun HEC-UL and HEC-UL+ must be installed with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B that ensure that moisture and dust does not enter the inverter. The inverter is designed for either floating or grounded PV installations. If the photovoltaic field installation is designed with either positive or negative poles connected to the ground, the pole ground connection must be connected within the inverter, specifically by means of the GFDI. For grounded arrays, do not connect the PV array to ground at any other point in the system (i.e. Photovoltaic panels, String Supervisor, etc...). Otherwise, the GFDI overcurrent monitoring will be compromised. Fastening hardware is not provided by Power Electronics. The following tables summarize the recommended fastening hardware. Terminal lug material Terminal lug diameter Bolts and nuts metric Tightening torque Ground connection Terminal lug material Terminal lug diameter DC connection Bolts and nuts metric Tightening torque Terminal lug material Terminal lug diameter Bolts and nuts metric Tightening torque AC connection Copper, Copper-Clad Aluminum or Aluminum 11mm/0.43in M8 (1/4) 8.11lb/ft (11Nm) 2-NEMA Copper, Copper-Clad Aluminum or Aluminum 14mm/01/2in (13mm/01/2in with external Disconnecting Unit) M12 (3/8) 25.81lb/ft (35Nm) 2-NEMA Copper, Copper-Clad Aluminum or Aluminum 14mm/01/2in M12 (3/8) 25.81lb/ft (35Nm) Paralleled conductors (AC phase, DC input, neutral, grounded circuit conductor, equipment grounding conductor, or equipment bonding jumper) shall comply with all of the following: Be the same length. Consist of the same conductor material. Be the same size in circular mil area. Have the same insulation type. Be terminated in the same manner. WIRING ACCESS AND CONNECTIONS 37 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.1 Ground connection Before connecting the AC and DC power connections, be sure that the chassis of the inverter is connected to ground through the dedicated terminals. The ground terminals are located in the right side and in the left side of the inverter. Ground terminals are labeled with the appropriate ground connection symbol. For safety reasons, measure the ground resistance of the plant itself. The ground resistance must be determined prior to the first start up of the Plant. It is installer’s responsibility to provide code compliant grounding conductor. WARNING When connecting the earth grounding electrode, ensure that all connected cables are securely tight with adequate strain relief. The specified torque for the M8 (1/4) PE terminals is 8.11lb/ft (11Nm). System grounding, as required by sections 690.41, 690.42 and 690.43 of the National Electric Code is the responsibility of the installer. Input and output circuits are isolated from the enclosure and the system grounding. The following picture shows the PE connection of the inverter: LETTER Distance mm in A 365 143/8 B 100 315/16 C 90 335/64 D 180 73/32 E 390 1523/64 Figure 6.1 PE connections [mm/in] Note: For inverters with the AC module located on the left side, the previous image is inverted. 38 WIRING ACCESS AND CONNECTIONS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.2 DC connections An active power source is connected. This means that, regardless of the operating mode of the inverter, there may be voltage present, either from the photovoltaic generator and/or the FREESUN. This is especially important to consider when disconnecting particular parts of the system. The Disconnecting Unit offers the possibility to isolate all the inverter from the DC voltage. As standard the isolation monitoring system is set at 1kΩ, this value is adjusted to compliance with UL 1741. In both the HEC-UL and HEC-UL+ inverters, the DC cables will be routed through the metallic panel situated in the bottom part of the inverter Disconnecting Unit and connected to the input plate. Each cable must be routed in the inverter only with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B. Cables must be brought from beneath the inverter. 6.2.1 DC connection for HEC-UL+ Inverters The metallic panel measurements for cable access are: LETTER Distance mm in A 330 13 B 130 51/8 C 250 927/32 D 650 2519/32 Figure 6.2 HEC-UL+ DC cables access Note: For inverters with the AC module located on the left side, the previous image is inverted. The removable panels are delivered NOT pre-drilled or pre-marked. The installer is responsible for installing the proper knockouts and water tight fittings in the glad plates. Use only the bottom removable panel to route the DC cables. The input configuration and the fuses value must be selected according to the PV installation characteristics and meet all code requirements. It is the responsibility of the installer to select the proper overcurrent values. WIRING ACCESS AND CONNECTIONS 39 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The next figure illustrates the DC connection of the inverter. LETTER Distance mm in LETTER Distance mm in A 375 1449/64 G 300 1113/16 B 350 1325/32 H 108 41/4 C 325 1251/64 I 45 13/4 D 275 1053/64 J 45 13/4 E 50 2 K Ø14 Ø035/64 F 90 335/64 Figure 6.3 DC input connection in the Disconnecting Unit module Note: For inverters with the AC module located on the left side, the previous image is inverted. The DC busbars are aluminum. The connections should be made based on the following recommendations. The maximum number of cables per fuse holder is two, one per side. Before connecting the cables, clean the contact surfaces with a clean cloth and ethanol cleaner. 1/2 It is recommended to use Ø14/0 copper, aluminum or copper-clad aluminum 2-NEMA terminal lugs. Use M12 (3/8) bolts and nuts, and apply a torque of 25.81lb/ft (35Nm). Use a spring washer and a fender washer between the nuts or bolts head and the busbar or terminal lug. Use copper, aluminum or copper-clad aluminum 90°C min cables with a minimum rated voltage of 1000V. The voltage on each of the main DC cables should be identical and the PV generator must never exceed the maximum permissible inverter input voltage of 1000Vdc. Otherwise the inverter could be damaged when connected. Refer to NEC section 310 for proper cable sizing based on maximum current, maximum ambient temperature and cable placement. 40 WIRING ACCESS AND CONNECTIONS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES 6.2.2 DC connection for HEC-UL Inverters The metallic panel measurements for cables access are: Figure 6.4 HEC-UL DC cables access [mm/in] The removable panels are delivered NOT pre-drilled or pre-marked. The installer is responsible for installing the proper knockouts and water tight fittings into the glad plates. Use only the bottom removable panel to route the DC cables. The input configuration and the fuse values must be selected according to the PV installation characteristics and meet all code requirements. It is the responsibility of the installer to select the proper overcurrent values. Up to 1,000Vdc may be present on the solar array. Use LOTO procedures to ensure the system is safely deenergized prior to making connections WIRING ACCESS AND CONNECTIONS 41 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The next figure illustrates the DC connection of the inverter. LETTER Distance mm in LETTER Distance mm in A 160 619/64 I 150 529/32 B 220 821/32 J 450 1723/32 C 280 11 K 490 1919/64 D 430 1659/64 L 108 41/4 E 1580 6213/64 M 45 13/4 F 1040 41 N 45 13/4 G 500 1911/16 O Ø13 Ø033/64 H 300 1113/16 Figure 6.5 DC input connection in the Disconnecting Unit cabinet The DC busbars are aluminum. The connections should be done as the following recommendations. The maximum number of cables per fuse holder is two, one per side. Before connecting the cables, clean the contact surfaces with a clean cloth and ethanol cleaner. 1/2 It is recommended to use Ø13/0 copper, aluminum or copper-clad aluminum NEMA-2 terminal lugs. Use M12 (3/8) bolts and nuts, and apply a torque of 25.81lb/ft (35Nm). Use a spring washer and a fender washer between the nuts or bolts head and the busbar or terminal lug. Use copper, aluminum or copper-clad aluminum 90°C min cables with a minimum rated voltage of 1000V. The voltage on each of the main DC cables should be identical and the PV generator must never exceed the maximum permissible inverter input voltage of 1000Vdc. Otherwise the inverter could be damaged when connected. Refer to NEC section 310 for proper cable sizing based on maximum current, maximum ambient temperature and cable placement. 42 WIRING ACCESS AND CONNECTIONS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES 6.3 AC Connection The main AC circuit inside the inverter is configured to connect a Dy11 transformer. For proper operation, do not connect the transformer neutral (Xo) to ground. High voltages may be present in the voltage-carrying components of the low-voltage and medium-voltage grids. The installer is responsible to work under the all locally applicable safety regulations and LOTO procedures for low-voltage and medium-voltage operation. • Ensure that the AC module circuit breakers are disconnected and safely lockedout/tagged out. • Disconnect the inverter from the DC sub-combiners. • Ensure that system is deenergized prior to making connections. The AC cables will be routed through the metallic panels situated in the bottom part of the AC module cabinet. All of the AC cables must be routed in the inverter only with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B. LETTER A B C D DISTANCE mm in 420 1617/32 240 929/64 120 423/32 130 51/8 Figure 6.6 AC module cabinet cables access Note: For inverters with the AC module located on the left side, the previous image is inverted. The cable length between the AC termination points must not exceed a maximum of 15 m (49ft) and the cables must be the same type to avoid unexpected operation. The cables for the three phase AC connection must have sufficient ampacity to prevent overheating and voltage drops. AC cables must meet all applicable local codes. Only the use of copper, aluminum or copper clad aluminum cables is permitted. WIRING ACCESS AND CONNECTIONS 43 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS The AC busbars are aluminum. The connections should be made with the following recommendations. Before connecting the cables, clean the contact surfaces with a clean cloth and ethanol cleaner. 1/2 It is recommended to use Ø14/0 copper, aluminum or copper-clad aluminum NEMA-2 terminal lugs. Use M12 (3/8) bolts and nuts, and apply a torque of 25.81lb/ft (35Nm). Use a spring washer and a fender washer between the nuts or bolts head and the busbar or terminal lug. Use copper, aluminum or copper-clad aluminum 90°C min cables with a minimum rated voltage of 1000V. Use only the bottom removable panel to route the AC cables. Figure 6.7 AC output connection busbars [mm/in] Note: For inverters with the AC module located on the left side, the previous image is inverted. The AC voltage from the inverter is configurable (208Vac, 330Vac, 360Vac or 390Vac) depending on the maximum output power and the MPPt voltage range. The installer is responsible for the selection of a power transformer considering the local regulations and the following recommendations: Recommended transformer configuration is Dy11. Input Voltage according to the rated output voltage of the inverter. Output voltage according to the connection point at the medium voltage side. Transformer Rated Power according to the delivered rated output power of the inverter. Environmental ratings according to installation requirements. The maximum number of cables that can be connected to the AC module busbars is 6 cables per phase. 44 WIRING ACCESS AND CONNECTIONS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.4 Overvoltage protections The Freesun HEC-UL and HEC-UL+ series inverters, as shown in the functional diagram, are equipped with internal AC and DC overvoltage protection. Optionally, the inverter can also be equipped with lightning protection. The AC main circuit overvoltage protection is equipped as standard with three surge suppression fuses (refer to figure 7.1 for location in the inverter). The main characteristics are shown in the following tables: AC OVERVOLTAGE PROTECTION SURGE SUPPRESSION FUSES Nominal Voltage (Un) Voltage Protection Level (Up) Nominal Discharge Current 8/20 µsec (In) 1000Vac 4.2kV 15kA Type Voltage Rating (Vac) 8/20 µsec Surge Rating VSP Size: 10x38mm 600V 15kA The DC overvoltage protection is installed in the inverter. The DC surge suppression is built-in removable modules that include a fault indication window. The DC surge suppression modules can be replaced using the top and bottom pushbuttons as shown in the following figure. Figure 6.8 DC overvoltage protection The main characteristics of the modules are shown in the following table: DC OVERVOLTAGE PROTECTION Nominal Voltage (Un) Voltage Protection Level (Up) 8/20 µsec Surge Rating 1000Vdc 4kV 40kA Furthermore, auxiliaries include an overvoltage protection. The main characteristics of the auxiliaries overvoltage protection are shown in the following table: AUXILIARIES OVERVOLTAGE PROTECTION Nominal Voltage (Un) Voltage Protection Level (Up) 8/20 µsec Surge Rating 275Vac 1.5kV 12.5kA WIRING ACCESS AND CONNECTIONS 45 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.5 Ground Fault protections For ungrounded PV installations, the inverter is equipped with an insulation monitor as standard. This detector monitors the insulation resistance of the array to ground, providing early indication of faults before leakage current may even be present. If the inverter is configured with two or more MPPt, the DC overvoltage and insulation monitor protection will be replicated in each MPPt. For more information, consult Power Electronics. The main features of the insulation monitor are shown in the next table: Rated Voltage (V) Set response value 1100Vdc 2kΩ INSULATION MONITOR For grounded PV installations, the inverter is equipped with a GFDI as standard. Do not connect to ground any other equipment (Eg. Photovoltaic panels, String Supervisor, neutral terminal of the inverter, etc...). Otherwise, the 5A overcurrent protection provided by the GFDI would not be effective. In grounded PV installations the inverter can only be configured with one MPPt. 6.6 Main circuit protections HEC-UL and HEC-UL+ inverters include AC mains circuit software and hardware protections. For more information about software protections consult the Programming and software manual. Each inverter includes a circuit breaker in the AC side. The circuit breaker rating is described in the following table: Rated Current (A) Breaking Capacity (kA) 2500A 100kA AC MODULE CIRCUIT BREAKER Each inverter module includes a circuit breaker in the AC side. The circuit breaker rating is described in the following table: Rated Current (A) Breaking Capacity (kA) 300A 65kA MODULES AC CIRCUIT BREAKER Each inverter module includes two DC fuses in their DC input. The main characteristics are shown in the following table. MODULE DC FUSES Type Rated Current (A) Breaking Capacity (kA) Screw to blade SPFJ300 Size: Class J 300A 10kA Each inverter module includes four DC measure protection fuses (located in figure 7.1, number 8). Two for panels DC voltage measure and two for DC bus voltage measure. The main characteristics are shown in the following table. DC MEASURE PROTECTION FUSES 46 Type Rated Current (A) PV amp rating: A10F Size: 10x38mm 1A WIRING ACCESS AND CONNECTIONS Breaking Capacity (kA) 10 to 30kAdc depending on the fuse model FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.7 Installation protection For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is mandatory that “Means shall be provided to disconnect all current-carrying dc conductors of a photovoltaic system from all other conductors in a building or other structure”. Power Electronics offers a Disconnecting Unit integrated in HEC-UL+ and external in HEC-UL Series inverters that includes upstream DC fuses and circuit breakers with the following characteristics: NEC’s Max. PV current (A) [1] #Fuse / Disc. Rating Disconnect #1 Disc. Rating (A) Fuse (A) & pole 1250 10 160 1600 1250 10 125 1000 1250 10 100 800 1250 10 90 720 1250 9 200 1250 1250 9 160 1152 1250 9 125 900 1250 9 100 720 1250 8 200 1250 1250 8 160 1024 1250 8 125 800 1250 7 250 1250 1250 7 200 1120 1250 7 160 896 1250 7 125 700 1250 6 300 1250 1250 6 250 1200 1250 6 200 960 1250 6 160 768 1250 5 350 1250 1250 5 300 1200 1250 5 250 1000 1250 5 200 800 1250 4 400 1250 1250 4 350 1120 1250 4 300 960 1250 4 250 800 1250 3 400 960 1250 3 350 840 1250 3 300 720 700 9 100 700 700 9 90 648 700 9 80 576 700 9 70 504 700 8 125 700 700 8 100 640 700 8 90 576 700 8 80 512 700 8 70 448 700 7 160 700 700 7 125 700 700 7 100 560 700 7 90 504 700 7 80 448 700 6 160 700 700 6 125 600 700 6 100 480 700 5 200 700 700 5 160 640 700 5 125 500 700 5 100 400 700 4 400 700 700 4 350 700 700 4 300 700 700 4 250 700 700 4 200 640 #2 Disc. #3 Disc. 2500 2000 1600 1440 2500 2304 1800 1440 2500 2048 1600 2500 2240 1792 1400 2500 2400 1920 1536 2500 2400 2000 1600 2500 2240 1920 1600 1920 1680 1440 1400 1296 1152 1008 1400 1280 1152 1024 896 1400 1400 1120 1008 896 1400 1200 960 1400 1280 1000 800 1400 1400 1400 1400 1280 3750 3000 2400 2160 3750 3456 2700 2160 3750 3072 2400 3750 3360 2688 2100 3750 3600 2880 2304 3750 3600 3000 2400 3750 3360 2880 2400 2880 2520 2160 2100 1944 1728 1512 2100 1920 1728 1536 1344 2100 2100 1680 1512 1344 2100 1800 1440 2100 1920 1500 1200 2100 2100 2100 2100 1920 NEC’s PV Continuous current (A) [2] #4 Disc. #1 Disc. 2800 2592 2304 2016 2800 2560 2304 2048 1792 2800 2800 2240 2016 1792 2800 2400 1920 2800 2560 2000 1600 2800 2800 2800 2800 2560 1250 1000 800 720 1250 1152 900 720 1250 1024 800 1250 1120 896 700 1250 1200 960 768 1250 1200 1000 800 1250 1120 960 800 960 840 720 700 648 576 504 700 640 576 512 448 700 700 560 504 448 700 600 480 700 640 500 400 700 700 700 700 640 #2 Disc. #3 Disc. 2500 2000 1600 1440 2500 2304 1800 1440 2500 2048 1600 2500 2240 1792 1400 2500 2400 1920 1536 2500 2400 2000 1600 2500 2240 1920 1600 1920 1680 1440 1400 1296 1152 1008 1400 1280 1152 1024 896 1400 1400 1120 1008 896 1400 1200 960 1400 1280 1000 800 1400 1400 1400 1400 1280 3750 3000 2400 2160 3750 3456 2700 2160 3750 3072 2400 3750 3360 2688 2100 3750 3600 2880 2304 3750 3600 3000 2400 3750 3360 2880 2400 2880 2520 2160 2100 1944 1728 1512 2100 1920 1728 1536 1344 2100 2100 1680 1512 1344 2100 1800 1440 2100 1920 1500 1200 2100 2100 2100 2100 1920 Disconnecting Unit Max. continuous current (A) [3] #4 Disc. #1 Disc. 2100 1944 1728 1512 2100 1920 1728 1536 1344 2100 2100 1680 1512 1344 2100 1800 1440 2100 1920 1500 1200 2100 2100 2100 2100 1920 1000 800 640 576 1000 922 720 576 1000 819 640 1000 896 717 560 1000 960 768 614 1000 960 800 640 1000 896 768 640 768 672 576 560 518 461 403 560 512 461 410 358 560 560 448 403 358 560 480 384 560 512 400 320 560 560 560 560 512 #2 Disc. #3 Disc. #4 Disc. 2000 1600 1280 1152 2000 1843 1440 1152 2000 1638 1280 2000 1792 1434 1120 2000 1920 1536 1229 2000 1920 1600 1280 2000 1792 1536 1280 1536 1344 1152 1120 1037 922 806 1120 1024 922 819 717 1120 1120 896 806 717 1120 960 768 1120 1024 800 640 1120 1120 1120 1120 1024 2000 2000 1920 1728 2000 2000 2000 1728 2000 2000 1920 2000 2000 2000 1680 2000 2000 2000 1843 2000 2000 2000 1920 2000 2000 2000 1920 2000 2000 1728 1680 1555 1382 1210 1680 1536 1382 1229 1075 1680 1680 1344 1210 1075 1680 1440 1152 1680 1536 1200 960 1680 1680 1680 1680 1536 1680 1555 1382 1210 1680 1536 1382 1229 1075 1680 1680 1344 1210 1075 1680 1440 1152 1680 1536 1200 960 1680 1680 1680 1680 1536 WIRING ACCESS AND CONNECTIONS 47 FREESUN HEC-UL & HEC-UL+ SERIES NEC’s Max. PV current (A) [1] #Fuse / Disc. Rating Disconnect #1 Disc. Rating (A) Fuse (A) & pole 700 4 160 512 700 4 125 400 700 3 400 700 700 3 350 700 700 3 300 700 700 3 250 600 700 3 200 480 700 2 400 640 700 2 350 560 700 2 300 480 700 2 250 400 400 7 80 400 400 7 70 392 400 6 90 400 400 6 80 384 400 6 70 336 400 5 100 400 400 5 90 360 400 5 80 320 400 4 125 400 400 4 100 320 400 3 200 400 400 3 160 384 400 2 300 400 400 2 250 400 400 2 200 320 250 4 80 250 250 4 70 224 250 3 125 250 250 3 100 240 250 3 90 216 250 3 80 192 250 3 70 168 250 2 160 250 250 2 125 200 250 2 100 160 250 2 90 144 250 2 80 128 250 2 70 112 #2 Disc. #3 Disc. 1024 800 1400 1400 1400 1200 960 1280 1120 960 800 800 784 800 768 672 800 720 640 800 640 800 768 800 800 640 500 448 500 480 432 384 336 500 400 320 288 256 224 1536 1200 2100 2100 2100 1800 1440 1920 1680 1440 1200 1200 1176 1200 1152 1008 1200 1080 960 1200 960 1200 1152 1200 1200 960 750 672 750 720 648 576 504 750 600 480 432 384 336 POWER ELECTRONICS NEC’s PV Continuous current (A) [2] #4 Disc. #1 Disc. 2048 1600 2800 2800 2800 2400 1920 2560 2240 1920 1600 1600 1568 1600 1536 1344 1600 1440 1280 1600 1280 1600 1536 1600 1600 1280 1000 896 1000 960 864 768 672 1000 800 640 576 512 448 512 400 700 700 700 600 480 640 560 480 400 400 392 400 384 336 400 360 320 400 320 400 384 400 400 320 250 224 250 240 216 192 168 250 200 160 144 128 112 #2 Disc. #3 Disc. 1024 800 1400 1400 1400 1200 960 1280 1120 960 800 800 784 800 768 672 800 720 640 800 640 800 768 800 800 640 500 448 500 480 432 384 336 500 400 320 288 256 224 1536 1200 2100 2100 2100 1800 1440 1920 1680 1440 1200 1200 1176 1200 1152 1008 1200 1080 960 1200 960 1200 1152 1200 1200 960 750 672 750 720 648 576 504 750 600 480 432 384 336 Disconnecting Unit Max. continuous current (A) [3] #4 Disc. #1 Disc. 1536 1200 2100 2100 2100 1800 1440 1920 1680 1440 1200 1200 1176 1200 1152 1008 1200 1080 960 1200 960 1200 1152 1200 1200 960 750 672 750 720 648 576 504 750 600 480 432 384 336 410 320 560 560 560 480 384 512 448 384 320 320 314 320 307 269 320 288 256 320 256 320 307 320 320 256 200 179 200 192 173 154 134 200 160 128 115 102 90 #2 Disc. #3 Disc. #4 Disc. 819 640 1120 1120 1120 960 768 1024 896 768 640 640 627 640 614 538 640 576 512 640 512 640 614 640 640 512 400 358 400 384 346 307 269 400 320 256 230 205 179 1229 960 1680 1680 1680 1440 1152 1536 1344 1152 960 960 941 960 922 806 960 864 768 960 768 960 922 960 960 768 600 538 600 576 518 461 403 600 480 384 346 307 269 1229 960 1680 1680 1680 1440 1152 1536 1344 1152 960 1280 941 960 922 806 960 864 768 960 768 960 922 960 960 768 600 538 600 576 518 461 403 600 480 384 346 307 269 [1] NEC’s Maximum PV current = Icc • 1.25 • 1.25. [2] NEC’s PV continuous current = Icc • 1.25. [3] The FSDU is intended to be connected to FS___CU units with the maximum continuous current indicated in the table. Differences between NEC’s PV Continuous current and Disconnecting unit maximum continuous current are caused by the different DC:AC ratios required in PV fields. The input configuration and the fuses value must be selected according to the PV installation design requirements. It is responsibility of the installer to select the correct value. The breaking capacity of the fuses is 10kA and the rated voltage 1000Vdc. For more information about a correct sizing of the fuses consult Power Electronics. Note: The solar panels short-circuit current is significantly below these values. The backfeed short-circuit currents available from the inverter are below the rated currents of the DC fuses and AC circuit breakers. 6.8 Auxiliary Power Source The HEC-UL and HEC-UL+ inverters have as standard an internal power transformer (situated in the AC module), that provides 3x400Vac 60Hz internal power supply for control and ventilation circuit. The internal supply is not available for customer equipment. Power Electronics inverters also have 3x208Vac 60Hz supply for external loads which provide up to 2kVA to an external system (Lighting, String supervisors, MeteoStation and others). 48 WIRING ACCESS AND CONNECTIONS FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 6.9 External Control Connections It is possible to command the inverter prepared for external power supply. In this case, the installer should route the cables together through the wiring conduit, then route the cables as close as possible to the right side chassis to reduce the internal interference emission. Finally, drill the bottom panel of the AC module and protect it only with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B. For more information, consult Power Electronics. 6.10 Control connection This section includes general information and recommendations about the inverter communication wiring. For further information about accessories connection (Power Control Interface, String Supervisor, Ripple control receiver, Freesun Data Center, Meteo Stations, ...), please consult the appropriate user manual. Consider the following recommendations prior to the control wiring installation: It is recommended to use shielded twisted cable with the shield connected to ground on one side only. The installer should route the cables through the bottom panel of the AC module cables access plate and protect them with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B to ensure the inverter degree of protection. The installer should route the cables through the wiring duct up to the module control board. Control wiring should be installed as far as possible from the power wiring. If it is necessary to cross power cables and control cables, these crossings must be done in a perpendicular way. Do not use control voltages of 24VDC and 208/120VAC over the same multiple wire cable or cable gutter. Figure 6.9 Control wiring restrictions Internally, each inverter module communicates with the master through CAN communication and synchronizes by cable. Externally, the modules can communicate with other devices through RS232 / RS485 / USB / Ethernet (Modbus RTU, Ethernet TCP/IP protocols). To connect and power Power Electronics accessories, follow the installation instructions of the respective manufacturers (ripple control receiver, router, meteorological stations …). WIRING ACCESS AND CONNECTIONS 49 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS Information about digital I/O and analog I/O is described below. Two analog sensors and one PT100 temperature sensor can be connected to each module of the Freesun HEC-UL and HEC-UL+. The maximum section for the control cables is 2.5mm² and the tightening torque is 0.4Nm. Figure 6.10 Control terminals for the user For further information about setting the input and output signals, please refer to the Freesun Programming and Software manual. 50 WIRING ACCESS AND CONNECTIONS POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES 7 COMMISSIONING Before commissioning, all work performed on the device should be thoroughly checked. Verify that the DC and AC voltages conform to the limits allowed on the inverter. 7.1 Initial Conditions WARNING Before starting the inverter, ensure that the grounding resistance is within site specified limits. Otherwise, the operator may be at risk of an electric shock. Use safety glasses and adequate PPE during operation with the door opened. 7.2 First Time Switch On Verify all connections have been made according to the previous “Wiring Access and Connection” section. Auxiliary control voltage switches on: 1. Switch on the auxiliary circuit breakers of each inverter module. These circuit breakers include the ones for the fans, soft load, input and output voltage measurement, auxiliary control voltage protection, etc. (See figure below 1). 2. Verify that the main AC circuit breaker of each inverter module is switched on. The main circuit breaker is located in the rear of the inverter module. (See figure below 2). 3. Switch on the following breakers located in the AC module Auxiliary control voltage circuit breaker. Auxiliary power source circuit breaker. RCD circuit breaker. Main auxiliary circuit breaker. 4. When all the breakers are switched ON, the inverter is powered with the auxiliary control voltage and the display unit is illuminated, indicating the state of each inverter module. (See figure below 3, 10). Voltage measurement: Check that the AC voltage corresponds with the output AC voltage configured in the inverter. Check that the AC phase sequence corresponds with the inverter phase sequence. Check that the DC voltage is below the maximum DC voltage in each MPPT. Power switch on: 5. Close the inverter’s doors. 6. Remove Lockout/Tagout locks and safeties. 7. For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is mandatory to use additional DC switches or fuses to disconnect the inverter from the PV installation. These DC switches are located in the Disconnecting Unit. Connect all of them and check that DC voltage is present in the input DC busbar of each MPPT of the inverter. In case the installation is equipped with String Supervisors by Power Electronics, ensure that the DC switches are connected. 8. Check that the medium voltage switchgear is switched on, so that the AC output of the inverter is connected to the grid. 9. Open the AC module window and switch on the main circuit breaker located in the output of the AC module of the inverter. (See figure below 4). COMMISSIONING 51 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 10. Finally, turn on the AC module switch key by selecting the “ON” position, allowing the beginning of the plate connection process (shown in the display as BSC status). 11. After the appropriate delay (300 seconds minimum per UL-1741), the DC contactor (6) of the modules will close, connecting the inverter to the DC side. 12. If the voltage (UAC), frequency (fAC) and DC input voltage (UPV) are within the acceptance range, the AC soft charge contactor (7) will be activated. After a short period of time, the main AC contactor (5) will be activated. In this way, the MPPT of the inverter selected is completely connected in both AC and DC sides, injecting power to the grid. 13. Inverters with multiple MPPT, please repeat steps from 10 to 12. Figure 7.1 FREESUN internal view. Inverter modules rear view (left), front view (center) and AC module (right) NUMBER 1 2 3 4 5 6 7 8 9 10 52 COMMISSIONING DESCRIPTION Auxiliary circuit Breakers Main module AC circuit breaker Auxiliary control power supply and auxiliary power source circuit breakers Main AC Circuit Breaker AC Module contactor DC contactor Soft charge contactor DC measure protection fuses Main circuit surge arrester and fuses Main auxiliary circuit breaker POWER ELECTRONICS FREESUN HEC-UL & HEC-UL+ SERIES 7.3 Switch Off FREESUN inverter maintenance and operation tasks may be only performed by qualified personnel. To safely deenergize the inverter, follow the next steps. Standard Switch off: Turn off the AC module switch key by selecting the “OFF” position. The AC contactor (5), the DC circuit breaker (6) of the modules will switch off and the bus discharge process is enabled during 30 seconds. Wait 5 minutes for the bus caps to discharge. Maintenance tasks switch off: 1. Turn off the AC module switch key by selecting the “OFF” position. The AC contactor (5), the DC circuit breaker (6) of the modules will switch off and the bus discharge process is enabled during 30 seconds. Wait 5 minutes for the bus caps to discharge. 2. Disconnect the main AC circuit breaker (4) using its specific window. 3. Disconnect main DC switch (Disconnecting Unit). Do not leave the inverter DC busbar energized. Use site approved LOTO procedures. 4. Open the inverter’s doors and disconnect Auxiliary circuit breakers (3, 10). CAUTION Voltage present on the DC bus. DC busbars and fuses of the Disconnecting Unit remain connected to the photovoltaic cables. Hazard voltages may be present. The Freesun inverter contains capacitors on the AC and DC sides that must discharge once the device has been switched off. After switching off, there are dangerous accidental-contact voltages present within the device, the discharge time of the capacitors is 5 minutes. COMMISSIONING 53 FREESUN HEC-UL & HEC-UL+ SERIES POWER ELECTRONICS 8 PREVENTIVE MAINTENANCE Freesun HEC-UL inverter requires minimum maintenance and supervision during its lifetime. Nevertheless the inverter consists of advanced semiconductor, electric and electronic devices. The temperature, humidity, dust, vibration, pollution and normal wear can reduce system efficiency. Ambient conditions Module ALL Input and output power Power connections Are the ambient temperature and the humidity within specification? Are there any abnormal noises or vibrations? Is the input and output power correct? Are the Power terminals correctly fastened? Conductor/ Cable Fuses LOW VOLTAGE MAIN CIRCUIT IGBT's module Correct capacitor Inductances Transformer AC contactor and circuit breakers Insulation resistance in grounded installations 54 CRITERION INSTRUMENT OF MEASUREMENT Thermometer, Temperature: Hygrometer, -4ºF to +122ºF (-20ºC to +50ºC). Datalogger. o Visual and audible. There are no anomalies. o Measure the displayed voltage between terminals L1, L2, L3 and between positive (+) and negative (-) DC poles. o Verify power connections one week after start-up. Annually check that the power Measure the temperature and Infrared connections temperatures are torque of the power thermometer. homogeneous and below 70ºC. connections. Torque key. Check that the bolts are torqued properly as indicated in the manual. Digital multimeter. Tester. Display. o Visual check. No anomaly. o Visual check. If the cabinet paint is scratched or removed, it could appear oxide and corrosion. o Visual check. No anomaly. Visual check. No anomaly. Visual check. Disconnect the output power cables of the inverter and measure the resistance value between: L1,L2,L3 DC(+), DC(-) with a tester > 10k No anomaly. o Check cabinet paint for visual damage or corrosion. Check the bottom connection metal panels for pools, dust or rubbish. Is the conductor corroded? Is the isolation of the cable damaged? Is there any fuse melted? INSPECTION METHOD External measurement. o Check sealing on the doors. Check doors, gratings and cabinet for visual damages. Cabinet Integrity and cleanness 2 years INSPECTION 3 months PERIOD INSPECTION ELEMENT Weekly INSPECTION SITE For maximum equipment usage, follow the recommended maintenance procedures summarized in the next table. o o o Check the resistance value between each one of the terminals Have fluid leaks been observed? Is the capacitor well fastened? Is any dilation or retraction sign observed? Measure the capacitance Is there any liquid leak? Is there any overheated point? Check for visual damage. Is there any overheated point? Is the contactor damaged? Are the circuit breakers placed in each module damaged? Is there any earth leakage? Is the grounded pole conductor damaged? PREVENTIVE MAINTENANCE o Digital multimeter. Analog tester. o Visual check. No anomaly Instrument for Measure the capacitance with Capacitance higher than 85% of measuring a proper instrument. rated capacitance. capacity. o Visual check. Measure the surface and connectors’ temperature. Visual check. Measure the surface and connectors’ temperature. No anomaly. Check that the temperature is homogeneous and below 70ºC. No anomaly. Check that the temperature is homogeneous and below 70ºC. Disconnect the power supply. Reset the circuit breaker with the test button. No anomaly. Disconnect the GFDI fuse. Measure the resistance between the grounded phase and earth. The resistance value is above 1kΩ. o o o o o o Infrared thermometer. Infrared thermometer. Digital multimeter. Analog tester. FREESUN HEC-UL & HEC-UL+ SERIES DISPLAY COOLING SYSTEM Cooling fans Are there any abnormal noises or oscillations? Is there any overheated module? Inlet and Outlet Are the gratings clogged by Gratings plastics or rubbish? 2 years INSPECTION 3 months PERIOD INSPECTION ELEMENT Weekly INSPECTION SITE POWER ELECTRONICS INSPECTION METHOD CRITERION o Disconnect the power supply (OFF) and rotate the fans manually. Check the connections. Check IGBT temperature. Fan should rotate effortlessly. No anomaly. o Visual check. No anomaly. Dust filters Are the dust filters obstructed? o Visual check. No anomaly. Measurement Are the voltage and current displayed values correct? o Check the reading instrument with an external measurement. Check the specified values and the control values. INSTRUMENT OF MEASUREMENT Voltage meter / Current meter etc. Note: Long life of the main components is based on a continuous operation for the stipulated load. These conditions can change based on the environmental conditions. CAUTION Voltage present on the DC bus. It should be taken into account that the DC busbars and fuses of the Disconnecting Unit remain connected to the photovoltaic cables. The device contains capacitors on the AC and DC sides that must discharge once the device has been switched off. After switching off, there are dangerous accidental-contact voltages present within the device, the discharge time of the capacitors is 5 minutes. PREVENTIVE MAINTENANCE 55 www.powerelectronics.es | www.power-electronics.com 24 Hours Technical Assistance 365 days a year +34 96 136 65 57 HEADQUARTER • VALENCIA • SPAIN C/ Leonardo da Vinci, 24 – 26 • Parque Tecnológico • 46980 – PATERNA • VALENCIA • ESPAÑA Tel. 902 40 20 70 • Tel. (+34) 96 136 65 57 • Fax (+34) 96 131 82 01 BRANCHES BARCELONA • Avda. de la Ferrería, 86-88 • 08110 • MONTCADA I REIXAC Tel. 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