1. technology and computing

Maintenance Manual
SUNNY CENTRAL 500CP-JP / 630CP-JP / 800CP-JP
SCCP-JP-WA-A4-en-12 | 98-103400.02 | Version 1.2
ENGLISH
Legal Provisions
SMA Solar Technology AG
Legal Provisions
The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either
partially or in full, requires the written permission of SMA Solar Technology AG. Any internal company copying of the
document for the purposes of evaluating the product or its correct implementation is allowed and does not require
permission.
SMA Warranty
You can download the current warranty conditions from the Internet at www.SMA-Solar.com.
Trademarks
All trademarks are recognized, even if not explicitly identified as such. A lack of identification does not mean that a
product or symbol is not trademarked.
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of these marks
by SMA Solar Technology AG is under license.
Modbus® is a registered trademark of Schneider Electric and is licensed by the Modbus Organization, Inc.
QR Code is a registered trademark of DENSO WAVE INCORPORATED.
Phillips® and Pozidriv® are registered trademarks of Phillips Screw Company.
Torx® is a registered trademark of Acument Global Technologies, Inc.
SMA Solar Technology AG
Sonnenallee 1
34266 Niestetal
Germany
Tel. +49 561 9522-0
Fax +49 561 9522-100
www.SMA.de
E-mail: [email protected]
© 2004 to 2014 SMA Solar Technology AG. All rights reserved
2
SCCP-JP-WA-A4-en-12
Maintenance Manual
SMA Solar Technology AG
Table of Contents
Table of Contents
1
Information on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
3
Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Skills of Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Personal Protective Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Design of the Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
Maintenance Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
Maintenance under Voltage Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1
5.2
5.3
5.4
6
Reading off the Replacement Interval Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading off Error Messages and Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the DC Load-Break Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Circuit Breaker (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
14
14
16
Maintenance under Voltage-Free Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Disconnecting the Inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Disassembling the Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Cleaning the Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3.1
Cleaning the Ventilation Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6.3.2
Cleaning the Air Duct and Ventilation Grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6.4 Servicing the Interior of the Switch Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.1
Checking the Interior of the Switch Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.4.2
Checking the Fuses/Disconnection Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.4.3
Checking the Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.4.4
Checking the Bolted Connections of the Power Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.4.5
Checking the Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.5 Checking the Switch Cabinet from the Outside . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.5.1
Checking the Door Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6.5.2
Checking the Latches, Door Stops and Hinges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.5.3
Checking the Surface of the Switch Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.5.4
Checking the Switch Cabinet for Corrosion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.6 Mounting the Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.7 Maintenance after Connecting the Control Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7
6.7.1
Connecting the Control Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
6.7.2
Checking the Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
6.7.3
Checking the Heating Element and the Hygrostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6.7.4
Checking the Function of the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Maintenance of Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.1 Maintenance of Sunny String-Monitor SSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.1.1
Maintenance Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
7.1.2
Disconnecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Maintenance Manual
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Table of Contents
7.1.3
SMA Solar Technology AG
Overview of the Main Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
7.1.4
Checking the Mounting Location and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.1.5
Checking the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.1.6
Checking the Inside of the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.1.7
Checking the Base Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
7.1.8
Checking the Covers and Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
7.1.9
Checking the Fuses and Fuse Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
7.1.10 Checking Bolted Connections and Clamp Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
7.1.11 Checking the Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
7.1.12 Checking the Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.1.13 Checking the Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.1.14 Checking the LEDs on the Measurement PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.2 Maintenance of the Sunny String-Monitor SSM8-21 / SSM16-21 / SSM24-21. . . . . . . . . . . . . . . . . . . . 39
7.2.1
Disconnecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
7.2.2
Maintenance Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
7.2.3
Overview of the Main Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
7.2.4
Checking the Mounting Location and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7.2.5
Checking the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7.2.6
Checking the Inside of the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7.2.7
7.2.8
Checking the Base Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Checking the Covers and Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
7.2.9
Checking the Fuse Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
7.2.10 Checking the Bolted, Clamp and Plug Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
7.2.11 Checking the Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7.2.12 Checking the Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7.2.13 Checking the Undervoltage Release (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7.2.14 Checking the Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7.2.15 Checking the LEDs on the Measurement PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
7.3 Maintenance of the Sunny Main Box Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.3.1
Disconnecting the Sunny Main Box Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
7.3.2
Maintenance Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
7.3.3
Overview of the Main Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
7.3.4
Checking the Mounting Location and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
7.3.5
Checking the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
7.3.6
Checking the Inside of the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
7.3.7
Checking the Base Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
7.3.8
Checking the Covers and Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
7.3.9
Checking the Fuses and Fuse Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
7.3.10 Checking Bolted Connections and Clamp Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
8
4
Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
SCCP-JP-WA-A4-en-12
Maintenance Manual
SMA Solar Technology AG
1 Information on this Document
1 Information on this Document
Validity
This document is valid for the following device types from production version A4:
• SC 500CP-10-JP (Sunny Central 500CP-JP)
• SC 630CP-10-JP (Sunny Central 630CP-JP)
• SC 800CP-10-JP (Sunny Central 800CP-JP)
The production version is indicated on the type label.
Figures in this document are reduced to the essential and may deviate from the real product.
Target Group
This document is intended for qualified persons. Only persons with the appropriate skills are allowed to perform the tasks
described in this document (see Section 2.3 "Skills of Qualified Persons", page 10).
Additional Information
Links to additional information can be found at www.SMA-Solar.com.
For additional information on third-party components, contact the relevant manufacturer.
Symbols
Symbol
Explanation
'$1*(5
Indicates a hazardous situation which, if not avoided, will result in death or serious injury
:$51,1*
Indicates a hazardous situation which, if not avoided, can result in death or serious injury
&$87,21
Indicates a hazardous situation which, if not avoided, can result in minor or moderate injury
/05*$&
Indicates a situation which, if not avoided, can result in property damage
Information that is important for a specific topic or goal, but is not safety-relevant
☐
Indicates a requirement for meeting a specific goal
☑
Desired result
✖
A problem that might occur
Schematic Diagram
Schematic diagrams in PDF format contain jump marks. By double clicking a jump mark, the display will change to the
corresponding current path or the referenced place in the equipment list.
SMA Solar Technology AG recommends using schematic diagrams in PDF format during installation. The schematic
diagrams in PDF format are available on request. Contact the SMA Service Line.
Maintenance Manual
SCCP-JP-WA-A4-en-12
5
1 Information on this Document
SMA Solar Technology AG
Typographies
Typography
bold
Use
Example
• Display messages
• Select the parameter ExlTrfErrEna and set to Off.
• Elements on a user
interface
• Select the tab Parameters.
• Parameters
• Terminals
• Slots
• Elements to be
selected
• Elements to be
entered
Nomenclature
In this manual, the Sunny Central CP-JP is also referred to as Sunny Central or inverter.
In this document, the Sunny Central Communication Controller is also referred to as SC-COM.
Abbreviations
Abbreviation Designation
Explanation
AC
Alternating Current
‒
DC
Direct Current
‒
ESD
Electrostatic Discharge
‒
GFDI
Ground-Fault Detection Interruption
‒
PE
Protective Earth
Protective conductor
PV
Photovoltaics
‒
6
SCCP-JP-WA-A4-en-12
Maintenance Manual
SMA Solar Technology AG
2 Safety
2 Safety
2.1 Intended Use
The Sunny Central is a PV inverter which converts the direct current generated in the PV modules into grid-compliant
alternating current. An external MV transformer fitted downstream feeds the generated alternating current into the utility
grid.
The Sunny Central is suitable for outdoor installation provided that the specified safety distances are maintained.
The Sunny Central for station installation is suitable exclusively for indoor installation provided that the specified safety
distances are maintained. The enclosure complies with degree of protection IP54. The Sunny Central is classified under
Class 4C2 according to EN 60721-3-4 and is suitable for operation in a chemically active environment.
The maximum permissible DC input voltage of the Sunny Central must not be exceeded.
The Sunny Central must only be operated in conjunction with a suitable MV transformer. The MV transformer must be
designed for voltages that arise during pulsed mode of the Sunny Central. The maximum AC voltages can reach the
following magnitudes to ground:
• For inverter type SC 500CP-JP, voltages of max. ±800 V to ground.
• For inverter type SC 630CP-JP, voltages of max. ±1,450 V to ground.
• For inverter type SC800CP-JP, voltages of max. ±1,450 V to ground.
Do not disconnect or adjust settings that affect grid management services without first obtaining approval from the grid
operator.
Alterations to the product, e.g. modifications or conversions, are only permitted with the express written permission of
SMA Solar Technology AG. Making unauthorized changes will void the warranty and will normally result in invalidation
of the operating permit. SMA Solar Technology AG shall not be held liable for any damage caused by such changes.
Only use the Sunny Central in accordance with the information provided in the enclosed documentation. Any other
application may cause personal injury or property damage.
The enclosed documentation is an integral part of this product. Keep the documentation in a convenient place for future
reference and observe all instructions contained therein.
Maintenance Manual
SCCP-JP-WA-A4-en-12
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2 Safety
SMA Solar Technology AG
2.2 Safety Precautions
This section contains safety precautions that must be observed at all times when working on or with the product.
To prevent personal injury and property damage and to ensure long-term operation of the product, read this section
carefully and follow all safety precautions at all times.
'$1*(5
Danger to life from electric shock due to live voltage
High voltages are present in the live components of the Sunny Central. Touching live components results in death or
serious injury due to electric shock.
• When working in a high contact-risk environment, wear personal protective equipment.
• Do not touch any live components.
• Follow the instructions precisely.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
• Provided live voltage is not absolutely necessary, always disconnect the following components from voltage
sources before performing any work on the inverter:
– Line voltage for grid feed-in
– Internal power supply
– DC voltage from the PV array
– Additional external voltages, e.g. control signals from a control room
• Ensure that no disconnected components can be reconnected.
• After disconnecting the Sunny Central from voltage sources, wait at least 15 minutes for the capacitors to
discharge completely before opening the Sunny Central.
• Before working on the Sunny Central, check that all devices are completely voltage-free.
• Ground and short-circuit.
• Cover or isolate any adjacent live components.
Danger to life from electric shock due to ground fault
If a ground fault has occurred, parts of the PV system that are supposedly grounded may in fact be live. Touching
incorrectly grounded components results in death or serious injuries from electric shock.
• Ensure that no voltage is present before touching any components of the PV system.
• Wear suitable personal protective equipment for all work on the Sunny Central.
Danger to life from electric shock if the Sunny Central is damaged
Operating a damaged Sunny Central can lead to hazardous situations that result in death or serious injuries due to
electric shock.
• Only use the Sunny Central when it is in a technically faultless condition and safe to operate.
• Regularly check the Sunny Central for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.
• Wear suitable personal protective equipment for all work on the Sunny Central.
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2 Safety
'$1*(5
Danger to life from electric shock even if the inverter is disconnected on the AC and DC sides
The precharge unit of the option "Q at Night" is live even if the AC contactor and the DC switch are open.
Touching live components of this assembly will result in death or serious injury.
• Do not touch any live components.
• Switch off the inverter.
• After switching off the inverter, wait at least 15 minutes before opening it until the inverter capacitors have
discharged completely.
• Before performing any work on the inverter, disconnect it and secure against reconnection.
• Ensure that no voltage is present.
• Do not remove protective covers.
• Observe the warning messages.
• Wear personal protective equipment.
:$51,1*
Danger to life from electric shock when entering the PV field
The insulation monitoring with GFDI, Remote GFDI and Soft Grounding does not provide protection from injury when
GFDI is activated. PV modules which are grounded with GFDI discharge voltage to ground. Entering the PV field can
result in lethal electric shocks.
• The inverter must be installed in a closed operating area.
• Before entering the PV field, switch the PV array to insulated operation.
• Ensure that the insulation resistance of the PV field is greater than 1 k Ω .
Danger to life due to blocked escape routes
In hazardous situations, blocked escape routes can lead to death or serious injury. Opening the doors of two
Sunny Central inverters located opposite each other blocks the escape route. It is imperative that the escape route is
freely accessible at all times.
• An escape route of at least 500 mm width must be available at all times. Make sure the minimum passage width
of the escape route meets local standards.
• Do not place any objects in the escape route area.
• Remove all tripping hazards from escape routes.
• If two Sunny Central inverters have been installed facing each other, never open the doors of both inverters
simultaneously.
Risk of fire due to failure to observe torque specifications on live bolted connections
Failure to follow the specified torques reduces the ampacity of live bolted connections so that the contact resistances
increase. This can cause components to overheat and catch fire.
• Ensure that live bolted connections are always tightened with the exact torque specified in this document.
• When working on the device, use suitable tools only.
• Avoid repeated tightening of live bolted connections as this may result in unacceptably high torques.
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2 Safety
SMA Solar Technology AG
&$87,21
Risk of burns due to hot components
Some components of the Sunny Central can get very hot during operation. Touching these components can cause
burns.
• Observe the warning messages on the devices.
• During operation, do not touch any components marked with such warnings.
• After disconnecting the PV system from voltage sources, wait until hot components have cooled down sufficiently.
• Wear suitable personal protective equipment for all work on the Sunny Central.
/05*$&
Damage to electronic components due to electrostatic discharge
By touching electronic components, you can damage or even destroy the inverter through electrostatic discharge (ESD).
• Observe the ESD safety regulations when working on the device.
• Wear suitable personal protective equipment for all work on the device.
• Discharge electrostatic charge by touching uncoated, grounded enclosure parts (e.g. near the grounding
connection on the doors). Only then is it safe to touch electronic components.
Damage to the devices due to dust or moisture penetration
Dust or moisture penetration can damage the Sunny Central or impair its functionality.
• Do not open the Sunny Central during rainfall or humidity of more than 95%.
• Only service the Sunny Central when the environment is dry and free of dust.
• Do not operate the Sunny Central with the door open.
• Switch on the circuit breaker for external supply voltage. This will activate the heating element and internal fans so
that they can switch on automatically.
• Mount all panels of the Sunny Central when maintenance work is interrupted.
• Close and lock the Sunny Central after interrupting or completing maintenance work.
2.3 Skills of Qualified Persons
The tasks described in this document must be performed by qualified persons only. Qualified persons must have the
following skills:
• Knowledge of how an inverter works and is operated
• Training in how to deal with dangers and risks associated with operating and maintaining electrical devices and
systems
• Training in the maintenance of electrical devices and systems
• Knowledge of all applicable standards and directives
• Knowledge of and compliance with this document and all safety precautions
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2 Safety
2.4 Personal Protective Equipment
Always wear suitable protective equipment
When working on the Sunny Central, always wear the appropriate personal protective equipment for the specific
job.
The following personal protective equipment is regarded by SMA Solar Technology AG to be the minimum requirement:
☐ In a dry environment, safety shoes of category S3 with perforation-proof soles and steel toe caps
☐ During precipitation or on moist ground, safety boots of category S5 with perforation-proof soles and steel toe caps
☐ Tight-fitting work clothes made of 100% cotton
☐ Suitable work pants
☐ Individually fitted hearing protection
☐ Safety gloves
Any other prescribed protective equipment must also be used.
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3 Product Description
SMA Solar Technology AG
3 Product Description
3.1 Design of the Inverter
Figure 1:
Design of the inverter
Position
Designation
A
Inverter cabinet
B
Interface cabinet
C
Ventilation grid
3.2 Type Label
The type label clearly identifies the product. There is one type label present in the Sunny Central. The type label is located
in the right-hand top corner inside the interface cabinet.
You will require the information on the type label to use the product safely and when seeking customer support from the
SMA Service Line. The type labels must be permanently attached to the product.
Reading off the serial number
You can read off the serial number without opening the inverter. The serial number can be found on the roof of the
inverter at the top left. You can also read off the serial number from the touch display.
Reading off the firmware version
You can read the version number of the firmware from the inverter and the touch display via the user interface of the
inverter or on the touch display.
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4 Maintenance Intervals
4 Maintenance Intervals
Shorter maintenance intervals in the event of adverse ambient conditions
The location of the PV system and ambient conditions influence the maintenance intervals.
• If the inverter is installed in adverse ambient conditions, SMA recommends a monthly inspection in order to
determine the need for maintenance. The maintenance intervals are to be shortened depending on the
determined maintenance requirements. In particular, cleaning work and corrosion protection may be necessary
more frequently.
• Adherence to the maintenance intervals ensures trouble-free operation of the inverter (see the maintenance
report of the inverter).
Maintenance under normal ambient and operating conditions:
Description
Interval
Routine maintenance
Every 24 months
Preventive replacement intervals:
Description
Interval
Replacement of 24 V power supply units*
Every ten years
Replacement of inverter bridge fan*
Every 13 years**
Replacement of interior fans*
Every 13 years**
GFDI / ABB high-performance circuit breaker*
After 100 trippings due to short circuit or after 7,000
switching cycles***
Remote Switch Unit of the GFDI*
After 7,000 switching cycles***
GFDI auxiliary signal contact*
Every six years
Surge arrester
If tripped
Key switch
In case of severe signs of wear
Label on the enclosure
If illegible, defective or missing
* Contact the SMA Service Line.
** For option "Q at Night", the replacement intervals are halved.
*** The trippings and switching cycles are recorded as instantaneous values (see Section 5.1 "Reading off the Replacement Interval Meter",
page 14).
Spare Parts
Spare parts can be identified via their reference designation and the circuit diagram. The spare parts list includes the
article numbers of each spare part. For information on a specific article number, contact the SMA Service Line.
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5 Maintenance under Voltage Conditions
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5 Maintenance under Voltage Conditions
5.1 Reading off the Replacement Interval Meter
1. Log into the user interface.
2. Enter the password in the appropriate field on the homepage and confirm with [Login].
3. Select Data > Device.
4. Select
.
☑ A list of all existing device types appears.
5. Select the device type Sunny Central.
☑ A list appears containing all existing devices of this type.
6. Select the desired device from the list.
7. Select the tab Instantaneous values.
8. Check the following meters and compare them with the replacement intervals (see Section 4, page 13):
– Number of GFDI trippings in the instantaneous value CntGfdiTripSw. If replacement of the GFDI is necessary,
the error message 7714 will appear on the display.
– Number of switching cycles of the Remote Switch Unit of the GFDI in the instantaneous value CntGfdiSw
9. If the corresponding instantaneous value is equal to or greater than the replacement interval of the device, replace
the device. Contact the SMA Service Line.
5.2 Reading off Error Messages and Warnings
You can connect a computer via the service interface on the outside of the interface cabinet.
If an error occurs, read off and resolve the error using the display or the user interface on the inverter (see Sunny Central
operating manual).
5.3 Checking the DC Load-Break Switch
'$1*(5
Danger to life from electric shock due to live voltage
High voltages are present in the live components of the Sunny Central. Touching live components results in death or
serious injury due to electric shock.
• When working in a high contact-risk environment, wear personal protective equipment.
• All work must be carried out in accordance with this document. Observe all safety precautions. Observe all safety
precautions included in this document and the inverter installation manual.
• Do not touch any live components of the inverter or the medium-voltage grid. Comply with all applicable safety
regulations for handling medium-voltage grids.
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Figure 2:
5 Maintenance under Voltage Conditions
Indicators and switches on the DC load-break switch
Position
Designation
A
Spring status indicator
B
Position indicator
C
ON button
D
OFF button
Requirements:
☐ Control voltage is present.
☐ DC voltage is present.
Procedure:
1. Switch the inverter to Stop.
2. Open the doors of the interface cabinet.
3. Check whether the DC load-break switch is switched off and is indicating the Off position.
If the DC load-break switch is not switched off or indicating the Off position, contact the SMA Service Line.
4. Close the doors of the interface cabinet.
5. Switch the inverter to Start.
6. Open the doors of the interface cabinet.
7. Check whether the DC load-break switch is switched on and or indicating the On position.
If the DC load-break switch is not switched on or indicating the On position, contact the SMA Service Line.
8. Switch the inverter to Stop.
9. Close the doors of the interface cabinet.
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5 Maintenance under Voltage Conditions
SMA Solar Technology AG
5.4 AC Circuit Breaker (Optional)
Figure 3:
Switch positions of the AC circuit breaker
Position
Designation
A
Off position
B
Triggered position
C
On position
Additionally required maintenance material (not included in the scope of delivery):
☐ A testing device approved by the manufacturer of the AC circuit breaker, e.g. TT1 from ABB.
Procedure:
• Use the testing device to check whether the AC circuit breaker is ready for operation (instructions for testing are
included in the documentation of the testing device).
If the AC circuit breaker is not ready for operation, contact the SMA Service Line.
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6 Maintenance under Voltage-Free Conditions
6 Maintenance under Voltage-Free Conditions
6.1 Disconnecting the Inverter
Prior to performing any maintenance work, disconnect the inverter from all voltage sources as described in this section.
Person authorized to operate the medium-voltage transformer
Only a duly authorized person is permitted to connect or disconnect the AC voltage of the medium-voltage
transformer.
'$1*(5
Electric shock due to live voltage
The components of the Sunny Central are energized. Touching components of the Sunny Central can result in serious
injuries or death.
• After switching off the inverter, wait at least 15 minutes before opening it, until the inverter capacitors have
discharged completely.
• Before performing any work on the inverter, disconnect it and secure against reconnection.
• Ensure that no voltage is present.
Procedure:
1. Set the key switch of the inverter to Stop.
2. Wait 15 minutes. This allows the capacitors to discharge.
3. Disconnect the external connection of the AC voltage of the medium-voltage transformer.
4. Disconnect the DC voltage in the main distributor (e.g. Sunny Main Box) or the sub-distributor
(e.g. Sunny String-Monitor).
5. Open the doors of the interface cabinet.
6. Switch off the AC circuit breaker in the inverter.
7. Disconnect the external voltage supply externally.
8. Disconnect any additional external voltage.
9. Switch off the circuit breaker of the external voltage supply and
disconnect the internal transformer for auxiliary power supply if
necessary.
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6 Maintenance under Voltage-Free Conditions
SMA Solar Technology AG
10. Switch off the circuit breaker of the grid monitoring.
11. Open the test and disconnect terminals.
12. Ensure that all poles are free of voltage.
13. Ground and short-circuit the inverter.
14. Cover or isolate any adjacent live components.
6.2 Disassembling the Panels
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Remove the screws of the front panels with a Torx screwdriver.
3. Detach the grounding straps from the panels.
4. Remove the panels.
5. Remove the protective covers in the connection area.
6. Ensure that all poles are free of voltage:
• on DC connection lugs/DC busbars/DC terminals
• on AC connection lugs
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6 Maintenance under Voltage-Free Conditions
6.3 Cleaning the Ventilation
6.3.1
1.
Cleaning the Ventilation Plate
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Remove the panels (see Section 6.2).
3. Pull the ventilation plate out of the inverter cabinet. To do this, grip
the ventilation plate from underneath and press upwards in the
middle.
4. Clean the ventilation plate with a brush or vacuum.
5. Slide the ventilation plate into the inverter cabinet. The ventilation
grid in the ventilation plate must face the rear panel.
☑ The ventilation grid is flush with the inverter enclosure.
✖ The ventilation plate will not go all the way in?
• Grasp the ventilation plate from underneath and press the
middle part upwards while sliding it in.
6.3.2
1.
Cleaning the Air Duct and Ventilation Grids
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Release the screws of the right-hand ventilation grid.
3. Pull the lower side of the right-hand ventilation grid forwards to
remove it.
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6 Maintenance under Voltage-Free Conditions
SMA Solar Technology AG
4. Release the screws of the left-hand ventilation grid.
5. Pull the lower side of the left-hand ventilation grid forwards to
remove it.
6. Vacuum the air duct from the outside or clean it with a brush.
7. Vacuum the ventilation grids or clean them with a brush.
8. Check the ventilation grids for visible damage.
☑ The ventilation grids are not damaged.
✖ The ventilation grids are damaged?
• Replace damaged ventilation grids.
9. Insert the right-hand ventilation grid.
10. Screw the right-hand ventilation grid on (torque: 20 Nm).
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6 Maintenance under Voltage-Free Conditions
11. Insert the left-hand ventilation grid.
12. Screw the left-hand ventilation grid on (torque: 20 Nm).
6.4 Servicing the Interior of the Switch Cabinet
6.4.1
1.
Checking the Interior of the Switch Cabinet
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check whether the switch cabinet is tight and whether the interior is damaged.
Eliminate any detected damage immediately.
4. Remove dirt and dust from the interior of the switch cabinet and from all assemblies (e.g. DC load-break switch and
AC circuit breaker).
5. If there is moisture present, remove it.
6.4.2
1.
Checking the Fuses/Disconnection Blades
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check the fuses/disconnection blades and tension springs for discoloration and changed appearance.
If they are discolored changed in any way,, replace them.
4. Check insulation and terminals for discoloration and signs of wear.
If they are discolored or look in any way different, contact the SMA Service Line.
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6 Maintenance under Voltage-Free Conditions
6.4.3
Figure 4:
SMA Solar Technology AG
Checking the Surge Arrester
Position of the overvoltage protectors
Position
Designation
A
Surge arrester
Additionally required maintenance material (not included in the scope of delivery):
☐ A surge arrester testing device approved by the manufacturer of the surge arrester such as the PM20 by
DEHN + SÖHNE GmbH + Co. KG.
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check if ready indicators are tripped.
If ready indicators are tripped, replace surge arresters.
4. Use the testing device to check that the surge arresters are operational (instructions for testing are included in the
testing device user manual).
If surge arresters are defective, replace them.
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6.4.4
6 Maintenance under Voltage-Free Conditions
Checking the Bolted Connections of the Power Cabling
/05*$&
Damage to bolted connections from over-tightening
• Only tighten loose bolted connections to the prescribed torque. Torque specifications are indicated in the circuit
diagram of the inverter. Contact the SMA Service Line if specifications are missing.
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check whether all bolted connections for the power cabling are tight.
If bolted connections are loose, tighten them using a torque wrench.
4. Check the insulation and connections for discoloration and changed appearance.
If insulation and connections are discolored or changed, contact the SMA Service Line.
5. Check the bolted connections for damage and contact elements for corrosion.
If bolted connections are damaged or contact elements corroded, replace them.
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6 Maintenance under Voltage-Free Conditions
6.4.5
SMA Solar Technology AG
Checking the Labels
Labels on the Inverter
Figure 5:
Position of the labels on the inverter
Position
SMA order number
Designation
A
86-029687
Use hearing protection
B
86-05200
Beware of dangerous voltage
C
86-79615
Beware of a danger zone
D
86-003303
Risk of electric shock from active power source
E
86-10867153
Dangerous touch voltage even when device is disconnected
86-003307
Five safety rules
86-003314
Dangerous touch voltage - disconnect the components
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6 Maintenance under Voltage-Free Conditions
Position
SMA order number
Designation
F
86-1086701025
Risk of burns due to hot fuses under the cover
G
86-0043553
Risk of electric shock from active power source
H
86-003307
Five safety rules
I
86-1086701026
The negative terminal in the PV array is grounded in the inverter.
86-1086701027
The positive terminal of the PV array is grounded in the inverter.
K
86-003304
Inadvertent tripping due to modified settings
L
86-003306
PV system protected by surge arresters
M
86-1086701023
Risk of electric shock from active power source
N
86-003305
Wrong connection will destroy the device
O
86-0099
Position of grounding
P
86-1086701024
Risk of burns due to hot components under the cover
Q
86-10867153
Dangerous touch voltage even when device is disconnected
Labels on the Silencing Baffle
Figure 6:
Position of the labels on the silencing baffle
Position
SMA order number
Designation
A
86-101500.01
Beware of hot surface
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check whether any warning message or label is damaged or missing.
Replace the warning messages and labels if they are missing or illegible. If necessary, you can order the labels from
SMA Solar Technology AG or your distributor under the SMA order number stated above.
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6 Maintenance under Voltage-Free Conditions
SMA Solar Technology AG
6.5 Checking the Switch Cabinet from the Outside
6.5.1
Checking the Door Seals
There are seals on the doors of the inverter.
Figure 7:
Section drawing with top view of seals (example)
Position
Designation
A
Seal
B
Side panel
C
Sealing area
D
Hinge
E
Door
F
Frame construction
Required maintenance material (not included in the scope of delivery):
☐ A suitable water-free, heat-resistant lubricant
☐ Talcum, petroleum jelly or wax.
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Check whether there is any damage to the seals in the sealing area. Note: the sealing area is not visible when the
door is closed.
If seals are damaged, contact the SMA Service Line.
4. Maintain seals with talcum, petroleum jelly or wax. This prevents frost damage.
5. After removing the side panels: check whether or not the seals in the side panels show any damage in the sealing
area.
If seals are damaged, contact the SMA Service Line.
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6.5.2
6 Maintenance under Voltage-Free Conditions
Checking the Latches, Door Stops and Hinges
Required maintenance material (not included in the scope of delivery):
☐ A suitable, water-free and heat-resistant lubricant, e.g. WD40
☐ Non-lubricating antifreeze agent (e.g. PS88)
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Check that the doors latch easily. Open and close the doors several times.
If the doors do not latch easily, lubricate all moving parts of the latch.
3. Check whether the doors are arrested.
If the doors are not arrested, lubricate the door stops.
4. Check whether the door hinges move easily.
If the door hinges do not move easily, lubricate them.
5. Lubricate all moving parts and movement points.
6. Tighten any loose screws with the corresponding torque.
7. If the inverter is installed in regions where below-freezing temperatures occur, apply the non-greasing antifreeze to
the profile cylinder of the door lock and the key switch in order to protect against freezing.
6.5.3
1.
Checking the Surface of the Switch Cabinet
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Check surfaces for damage or corrosion.
If the surfaces are damaged or corroded, repair them without delay or within three weeks at the latest.
6.5.4
Checking the Switch Cabinet for Corrosion
Required maintenance material (not included in the scope of delivery):
☐ Use touch-up sticks, paint brushes, cans of spray paint or, alternatively, 2K-PUR acrylic paint in the appropriate
RAL color to repair small-area surface damage. Observe the relevant instructions of the paint manufacturer.
☐ Use touch-up paint or alternatively 2K-PUR acrylic paint in the appropriate RAL color to repair large-area surface
damage. Observe the relevant instructions of the paint manufacturer.
Position
RAL color
Shade
Roof
RAL 7004
Signal gray
Base
RAL 7004
Signal gray
Enclosure
RAL 9016
Traffic white
Silencing baffle*
RAL 7035
Light gray
* optional
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6 Maintenance under Voltage-Free Conditions
SMA Solar Technology AG
☐ Abrasive cloth
☐ Degreaser
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Open the inverter doors.
3. Remove dirt.
4. To remove small-area surface damage:
• Sand the surface.
• Clean the surface with degreaser.
• Paint the surface.
5. To remove large-area surface damage:
• Sand the surface.
• Clean the surface with degreaser.
• Paint the entire surface.
6.6 Mounting the Panels
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Switch off the inverter and wait at least 15 minutes it, until the capacitors have discharged completely.
• Disconnect the inverter (see Section 6.1).
2. Mount the protective covers.
3. Fasten the grounding conductors to the panels of the interface cabinet. Torque: 8 Nm
4. Ensure that the grounding straps are firmly in place.
5. Fasten the panels using screws.
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6 Maintenance under Voltage-Free Conditions
6.7 Maintenance after Connecting the Control Voltage
6.7.1
Connecting the Control Voltage
:$51,1*
Danger to life from electric shock due to live voltage
High voltages are present in the conductive components of the inverter. Touching live components results in death or
serious injury due to electric shock.
• Wear suitable personal protective equipment for all work on the device.
• Do not touch any live components.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
Procedure:
1. Switch the inverter to Stop.
2. Open the doors of the interface cabinet.
3. Switch the circuit breaker of the grid monitoring on.
4. Connect additional external voltage.
5. Connect external voltage supply.
6. Connect the AC circuit breaker.
7. Connect DC voltage in main distribution box or sub-distribution box.
8. Make the external AC voltage connection of the medium-voltage transformer.
6.7.2
Checking the Fans
:$51,1*
Danger to life from electric shock due to live voltage
High voltages are present in the conductive components of the inverter. Touching live components results in death or
serious injury due to electric shock.
• Wear suitable personal protective equipment for all work on the device.
• Do not touch any live components.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
Requirement:
☐ Control voltage is connected(see Section 6.7.1, page 29)
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SMA Solar Technology AG
Procedure:
1. Switch the inverter to Stop.
2. Open the doors of the interface cabinet.
3. Switch on the circuit breaker of the external voltage supply.
☑ The fans start to run for a few moments.
✖ The fans do not start?
• Contact the SMA Service Line.
4. Close the inverter doors.
6.7.3
Figure 8:
Checking the Heating Element and the Hygrostat
Position of the heating element and the hygrostat
Position
Designation
A
Hygrostat
B
Heating element
:$51,1*
Danger to life from electric shock due to live voltage
High voltages are present in the conductive components of the inverter. Touching live components results in death or
serious injury due to electric shock.
• Wear suitable personal protective equipment for all work on the device.
• Do not touch any live components.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
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6 Maintenance under Voltage-Free Conditions
&$87,21
Risk of burns due to hot heating elements
During the functional test, the heating element gets hot. There is a risk of burns if you touch the heating element without
safety gloves.
• Do not touch heating elements with bare hands.
• Wear personal protective equipment.
• Always maintain a suitable safety distance when checking the function of the heating elements.
Requirement:
☐ The circuit breaker for the external supply voltage must be switched on.
Procedure:
1. Switch the inverter to Stop.
2. Open the inverter doors.
3. Set the hygrostat to the minimum value. To do this, pull the selector switch out slightly. Tip: the hygrostat is adjusted
correctly once the relay of the hygrostat emits an audible click.
4. Check whether the heating elements are radiating heat after a delay time of five minutes.
If the heating elements are not radiating heat, contact the SMA Service Line.
5. Reset the hygrostat to the initial value. To do this, press the selector switch back towards the hygrostat. The initial
value of the hygrostat is indicated in the circuit diagram. The standard values are marked in white on the selector
switch and the hygrostat. The standard value of the hygrostat is set when both markings are aligned.
6. Close the inverter doors.
6.7.4
Figure 9:
Checking the Function of the UPS
Position of the UPS in the inverter
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6 Maintenance under Voltage-Free Conditions
SMA Solar Technology AG
:$51,1*
Danger to life from electric shock due to live voltage
High voltages are present in the conductive components of the inverter. Touching live components results in death or
serious injury due to electric shock.
• Wear suitable personal protective equipment for all work on the device.
• Do not touch any live components.
• Observe all warning messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
Procedure:
1. Switch the inverter to Stop.
2. Open the doors of the interface cabinet.
3. Measure the voltage at the supply voltage output between L1 and N.
☑ The voltage is approximately 230 V.
✖ Voltage deviates significantly?
• Contact the SMA Service Line.
4. Measure the voltage at the control voltage output of the UPS at -X400 terminal 5 and -X402 terminal 5.
☑ The voltage is approximately 24 V.
✖ Voltage deviates significantly?
• Contact the SMA Service Line.
5. Switch off the circuit breaker of the external supply voltage and
disconnect the internal transformer for auxiliary power supply if
applicable.
6. Stop the time until the SC-COM switches off.
☑ The SC-COM switches off after 15 minutes at the earliest.
✖ The SC-COM switches off sooner?
• Contact the SMA Service Line.
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7 Maintenance of Accessories
7 Maintenance of Accessories
7.1 Maintenance of Sunny String-Monitor SSM
7.1.1
Maintenance Interval
• Service the Sunny String-Monitor every 24 months.
7.1.2
Disconnecting the Sunny String-Monitor
'$1*(5
Danger to life due to electric shock when live components of the Sunny String-Monitor are touched.
• Observe the safety rules:
– Disconnect the device from voltage sources.
– Ensure that the device cannot be reconnected.
– Make sure that no voltage or current is present on the components.
– Cover or isolate any adjacent live components.
• Only carry out maintenance work if the device is voltage-free.
• Open the isolation terminals only when the device is voltage-free.
• Plug in or remove the DC connector only when the device is voltage-free.
Procedure:
1. If there is a DC circuit breaker on the Sunny String-Monitor, disconnect it. This ensures that there is no current flowing
through the Sunny String-Monitor.
2. If there is no DC circuit breaker, disconnect the Sunny Central (see the installation manual for the Sunny Central).
3. If there are fuses in the Sunny Central, remove them.
4. If there are no fuses in the Sunny Central, remove the fuses in the DC main distributor.
5. Only open the isolation terminals in no-load condition.
6.
'$1*(5
Danger to life from electric arcs when removing the DC connectors
• Remove any DC connectors only when the Sunny String-Monitor is switched off.
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7 Maintenance of Accessories
7.1.3
SMA Solar Technology AG
Overview of the Main Components
Figure 10: Main components of the Sunny String-Monitor SSM (example)
Position
Designation
A
Cover latch
B
DC fuses
C
LEDs for displaying the operating state
D
Surge arrester
E
DC switch
F
Terminals for connecting the signaling cable for the monitoring contact*
G
Terminals for connecting the auxiliary trigger*
H
Stud terminal for connecting the DC main cable
I
Spring-cage terminals for the string connections
K
Plug for connecting the strings
L
Terminals for the grounding connection
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Position
Designation
M
Terminals for connecting the data cables
N
Cable glands for connecting the DC main cable
O
Cable glands for the string connections
P
Cable gland for the grounding connection
Q
Vent plug
R
Cable glands for the communications connection
S
Cable glands for connecting the remote tripping*
T
Cable glands for connecting the monitoring contact*
7 Maintenance of Accessories
* optional
7.1.4
Checking the Mounting Location and Installation
• Ensure that the mounting location is accessible.
• Remove all inflammable materials.
• Ensure that the Sunny String-Monitor is securely in place.
• Ensure that the Sunny String-Monitor is not exposed to direct solar irradiation.
7.1.5
Checking the Enclosure
• Check whether the enclosure is damaged.
If the enclosure is badly damaged or cracked, contact the SMA Service Line for a replacement enclosure.
• Inspect the latches and screws on the cover of the Sunny String-Monitor SSM:
• Check whether the cover latches are worn out.
If they are worn out, contact the SMA Service Line.
• Check whether the cover screws are damaged or dirty.
If dirty or damaged, clean or replace.
• Ensure that the cover is securely in place.
• Check whether the side vent plugs are clogged.
Clean or replace the vent plugs if they are badly clogged.
7.1.6
1.
Checking the Inside of the Enclosure
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Check the tightness of the device.
3. Ensure that the drain plugs and vent plugs are intact and clean.
4. Ensure that there is no condensation water inside the enclosure.
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7 Maintenance of Accessories
7.1.7
1.
SMA Solar Technology AG
Checking the Base Plate
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Ensure that the vent plug on the Sunny String-Monitor SSM is not clogged or damaged.
If the vent plugs are clogged or damaged, clean or replace them.
3. Ensure that all cable glands are sealed and securely in place.
4. Ensure that the connectors are undamaged and securely in place.
7.1.8
Checking the Covers and Labels
Figure 11: Position of the labels on the Sunny String-Monitor SSM
Position
SMA order number
Designation
A
86-0520
Beware of dangerous voltage
B
86-0512
Positive terminal
C
86-108670101
Damage to the plant due to incorrectly rated fuses
86-1086701022
Risk of electric shock from active power source
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7 Maintenance of Accessories
Position
SMA order number
Designation
D
86-004610
Wrong connection will destroy the device
E
86-0509
Grounding
F
86-0514
Negative terminal
Procedure:
• Ensure that the warning labels on and inside the device are present and undamaged.
Replace the warning labels if they are damaged or missing.
• Check whether the cover latches are undamaged and securely in place.
Replace the cover latches if they are damaged or loose.
7.1.9
1.
Checking the Fuses and Fuse Holders
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Ensure that the DC fuses and tension springs of the fuse holders are securely in place.
7.1.10 Checking Bolted Connections and Clamp Connections
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Ensure that the bolted connections of the power cables are securely in place.
3. Ensure that the clamp connections of the PV strings are securely in place.
4. Ensure that the clamp connections of the optional DC circuit breaker are securely in place.
5. Check whether the bolted and clamp connections on the insulation and the terminals are discolored or changed.
If the bolted and clamp connections are discolored or look in any way different, replace them.
6. Ensure that the shield clamping saddle is securely in place.
7.1.11 Checking the Surge Arrester
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Check whether the ready indicator of the surge arrester is red.
If the ready indicator is red, replace the protection module.
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7 Maintenance of Accessories
SMA Solar Technology AG
7.1.12 Checking the Supply Voltage
Required maintenance material (not included in the scope of delivery):
☐ Voltmeter
Requirement:
☐ The circuit breaker of the voltage supply for the Sunny Central must be switched on.
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Measure the supply voltage between the terminals and connectors.
☑ Supply voltage must be at least 30 V.
✖ The supply voltage is less than 30 V?
• Check the clamp terminals. Attach the cable if necessary.
7.1.13 Checking the Ground Connection
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. Check the ground connection and the contact resistance to the ground potential.
7.1.14 Checking the LEDs on the Measurement PCB
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.1.2).
2. If the red LED of the operating state indicator is on, contact the SMA Service Line.
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7 Maintenance of Accessories
7.2 Maintenance of the Sunny String-Monitor SSM8-21 / SSM16-21 /
SSM24-21
7.2.1
Disconnecting the Sunny String-Monitor
'$1*(5
Danger to life from electric shock by touching live components of the Sunny String-Monitor
Touching live components results in death or serious injury.
• Observe the safety rules:
– Disconnect the device from voltage sources.
– Ensure that the device cannot be reconnected.
– Ensure that no voltage or current is present.
– Cover or isolate any adjacent live components.
• Only carry out maintenance work if the device is voltage-free.
• Plug in or remove the DC connector only when the device is voltage-free.
&$87,21
Risk of burns from touching hot components
Components can get very hot during operation. Touching hot components can result in burn injuries.
• Wear personal safety equipment when working on the device.
• Do not touch hot components.
• Before touching any components, make sure that they have cooled down sufficiently.
Procedure:
1. If there is a load-break switch installed, turn it off. This ensures that there is no current flowing through the
Sunny String-Monitor.
2. If there is no DC load-break installed, disconnect the Sunny Central inverter (see the Sunny Central installation
manual).
If there are fuses in the Sunny Central, remove them (see the Sunny Central installation manual).
or
If there are no fuses in the Sunny Central, remove the fuses in the DC main distributor.
3.
'$1*(5
Danger to life due to electric arcs when opening the fuse holders
• Only open the fuse holders in the Sunny String-Monitor when it is switched off.
4.
'$1*(5
Danger to life from electric arcs when removing the DC connectors
• Only remove all existing DC connectors when the Sunny String-Monitor is switched off.
7.2.2
Maintenance Interval
• Service the Sunny String-Monitor every 24 months.
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7 Maintenance of Accessories
7.2.3
SMA Solar Technology AG
Overview of the Main Components
Figure 12: Main components of the Sunny String-Monitor SSMxx-21 (example)
Position
Designation
A
Fuse holder
B
Connector for signal contact* or remote tripping*
C
Surge arrester
D
Vent plug
E
DC connector SUNCLIX*
F
Terminals* or busbar*
G
Connector for data cable
H
Condensate drain
I
Cable entry plate for the string cables*
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7 Maintenance of Accessories
Position
Designation
K
Cable glands for DC main connection, communication, grounding, signal contact* or remote
tripping*
* optional
7.2.4
Checking the Mounting Location and Installation
• Remove all inflammable materials.
• Ensure that the Sunny String-Monitor is securely in place.
• Ensure that the Sunny String-Monitor is not exposed to direct solar irradiation.
• Ensure that the mounting location is accessible at all times.
7.2.5
Checking the Enclosure
• Check whether the enclosure is damaged.
Replace the enclosure if it is badly damaged or cracked.
• Ensure that the vent plugs in the enclosure are intact and clean.
• Ensure that the lock is intact and functional.
7.2.6
1.
Checking the Inside of the Enclosure
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Check the tightness of the device.
3. Ensure that the drain plugs are intact and clean.
4. Ensure that there is no condensation water inside the enclosure.
7.2.7
1.
Checking the Base Plate
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Ensure that all cable glands are sealed and securely in place.
3. Ensure that the DC connectors are intact and securely in place.
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7 Maintenance of Accessories
7.2.8
SMA Solar Technology AG
Checking the Covers and Labels
Figure 13: Position of the labels in and on the Sunny String-Monitor SSMxx-21 (example)
Position
SMA order number
Designation
A
86-0043674*
Risk of burns due to hot components under the cover
B
86-051488
Beware of dangerous voltage
C
86-0514
Negative terminal (L-)
D
86-0043674*
Three labels with warning messages on fuses and fuse holders
E
86-0043674*
The negative terminal in the PV array is grounded in the inverter
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7 Maintenance of Accessories
Position
SMA order number
Designation
F
86-0043674*
Two labels:
Risk of electric shock from active power source
and
Damage to the PV system due to incorrectly dimensioned fuses.
Maximum output current: 200 A
or
Risk of electric shock from active power source
and
Damage to the PV system due to incorrectly dimensioned fuses.
Maximum output current: 280 A
G
86-0043674*
The positive terminal of the PV array is grounded in the inverter.
H
86-0512
Positive terminal (L+)
* Material number of the label sheet with all warning message labels for all product variants
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Ensure that the warning labels on and inside the device are present and undamaged.
Replace the warning labels if they are damaged or missing. Make sure you choose a label that is correct for the
product variant.
3. Check whether the cover latches are undamaged and securely in place.
Replace the cover latches if they are damaged or loose.
7.2.9
1.
Checking the Fuse Holders
'$1*(5
Danger to life due to electric arcs when opening the fuse holders
• Only open the fuse holders in the Sunny String-Monitor when it is switched off.
2. Check the fuse holders for discoloration or changed appearance.
If they are discolored or changed in any way, contact the SMA Service Line.
3. Ensure that each fuse holder opens and closes properly.
7.2.10 Checking the Bolted, Clamp and Plug Connections
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Ensure that the bolted connections of the power cabling are securely in place.
3. Check whether the bolted and clamp connections on the insulation and the terminals are discolored or changed.
If the bolted and clamp connections are discolored or look in any way different, replace them.
4. Ensure that the connectors are intact and securely in place.
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7 Maintenance of Accessories
SMA Solar Technology AG
7.2.11 Checking the Surge Arrester
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Check whether the ready indicator on the surge arrester is red.
If the ready indicator is red, replace the protection module.
7.2.12 Checking the Supply Voltage
Required maintenance material (not included in the scope of delivery):
☐ Voltmeter
Requirement:
☐ The circuit breaker of the voltage supply for the Sunny Central must be switched on.
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Measure the supply voltage at the connector on the lowest String-Monitor Unit.
☑ Supply voltage must be at least 30 V.
✖ The supply voltage is less than 30 V?
• Check the clamp terminals. Attach the cable if necessary.
7.2.13 Checking the Undervoltage Release (Optional)
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Open the Sunny String-Monitor.
3. Disconnect the voltage at the undervoltage release.
4. Check whether the DC load-break switch has switched to the tripped position.
If the DC load-break switch has not switched to the tripped position, contact the SMA Service Line.
5. Switch the voltage at the undervoltage release back on. To switch on the 200 A and 280 A DC load-break switch,
the voltage applied must be greater than 85% of the nominal voltage VN.
6. Switch the DC load-break switch to the Off position.
7. Switch the DC load-break switch back to the On position.
8. Close the Sunny String-Monitor.
7.2.14 Checking the Ground Connection
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. Check the ground connection and the contact resistance to the ground potential.
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7 Maintenance of Accessories
7.2.15 Checking the LEDs on the Measurement PCB
Figure 14: LED Error on the String-Monitor unit
Position
Designation
A
LED Error
Procedure:
1.
'$1*(5
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the Sunny String-Monitor from voltage sources (see Section 7.2.1).
2. If the red Error LED on the String-Monitor unit is glowing, contact the SMA Service Line.
7.3 Maintenance of the Sunny Main Box Cabinet
7.3.1
Disconnecting the Sunny Main Box Cabinet
'$1*(5
Danger to life due to electric shock if live components of the Sunny Main Box Cabinet are touched
Touching live components results in death or serious injury.
• Observe the safety rules:
– Disconnect the device from voltage sources.
– Ensure that the device cannot be reconnected.
– Ensure that no voltage or current is present.
– Cover or isolate any adjacent live components.
• Only carry out maintenance work if the device is voltage-free.
Procedure:
1. If there are DC circuit breakers in the DC sub-distributors, e.g. Sunny String-Monitor, turn off all DC circuit breakers
of the DC sub-distributors connected to the Sunny Central (see installation manual of the DC sub-distributor).
2. If there are no DC circuit breakers in the DC sub-distributor, e.g. Sunny String-Monitor, remove all fuses in the DC
sub-distributors connected to the Sunny Central (see installation manual of the DC sub-distribution box).
3. If there are fuses in the Sunny Central, remove them (see the Sunny Central installation manual).
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7 Maintenance of Accessories
7.3.2
SMA Solar Technology AG
Maintenance Interval
• Service the Sunny Main Box every 24 months.
7.3.3
Overview of the Main Components
Figure 15: Main components in the interior of the Sunny Main Box Cabinet
Position
Designation
A
DC busbar +terminal or ‒terminal depending on PV system
B
DC fuses or disconnection blades
C
DC inputs positive terminal or negative terminal depending on PV system
D
Grounding terminal
7.3.4
Checking the Mounting Location and Installation
• Ensure that the mounting location is accessible.
• Ensure that the Sunny Main Box Cabinet is securely in place.
• Remove all inflammable materials.
• Ensure that the Sunny Main Box Cabinet is not exposed to direct solar irradiation.
7.3.5
Checking the Enclosure
• Check whether the enclosure is damaged.
If the enclosure is damaged, contact the SMA Service Line.
• Check the tightness of the enclosure.
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7.3.6
7 Maintenance of Accessories
Checking the Inside of the Enclosure
'$1*(5
Danger to life due to electric shock if live components of the Sunny Main Box Cabinet are touched
Touching live components results in death or serious injury.
• Observe the safety rules:
– Disconnect the device from voltage sources.
– Ensure that the device cannot be reconnected.
– Ensure that no voltage or current is present.
– Cover or isolate any adjacent live components.
• Only carry out maintenance work if the device is voltage-free.
Procedure:
• Check whether the enclosure interior is damaged.
If the enclosure interior is damaged, contact the SMA Service Line.
• Remove any dirt build-up on the enclosure openings for the connection cables. Replace damaged or unsealed
enclosure openings for the connection cables.
• Ensure that there is no condensation water inside the enclosure.
• Ensure that the door mechanism is securely in place and sealed.
7.3.7
Checking the Base Plate
• Ensure that the foam around the base plate is intact.
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7 Maintenance of Accessories
7.3.8
SMA Solar Technology AG
Checking the Covers and Labels
Figure 16: Position of the labels on the Sunny Main Box Cabinet
Position
SMA order number
Designation
A
86-0520
Active power source
B
86-1086701022
Risk of electric shock from active power source
86-1086701028
Risk of electric arc
C
86-051489
Dangerous voltage
D
86-05081
Grounding
E
86-1086701024
Risk of burns
86-1086701028
Risk of electric arc
F
86-0512
L+
G
86-0514
L‒
Procedure:
• Ensure that the latches of the plexiglass covers are undamaged and securely in place.
Replace the latches if they are damaged or loose.
• Ensure that the warning labels on and inside the device are present and undamaged.
Replace the warning labels if they are damaged or missing.
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7.3.9
7 Maintenance of Accessories
Checking the Fuses and Fuse Holders
• Ensure that the DC fuses and tension springs of the fuse holders are securely in place.
Replace the DC fuses or fuse holders if they are loose.
7.3.10 Checking Bolted Connections and Clamp Connections
• Ensure that all bolted and clamp connections are securely in place.
• Ensure that the strain relief of the entire cabling is intact.
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8 Contact
SMA Solar Technology AG
8 Contact
If you have technical problems concerning our products, contact the SMA Service Line. We need the following data in
order to provide you with the necessary assistance:
• Device type
• Serial number
• Production version
• Installation address with GPS coordinates
• Plant name
• Photographs of defective devices
• Type and number of PV modules connected
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www.SMA-Solar.com