DS-58[20] Data Sheet , V 2.0b ,June. 2013 DS-58[20] Absolute position, rotary Electric Encoder™ The DS-58[20] is a member of the DS series of Electric Encoders, based on Netzer Precision proprietary technology. These encoders offer many advantages, some unparalleled: Low profile (10 mm). Hollow, floating shaft. No bearings or other contacting elements. High precision. High tolerance to temperature, shock, moisture, EMI & RFI. Insensitive to magnetic fields. Very low weight. The DS-58 is suited to demanding application such as: aerospace, medical, instrumentation, automation, etc. Mechanical Allowable mounting eccentricity (operational) Allowable rotor axial motion (operational) ±0.1 mm ±0.1 mm Rotor inertia 800 gr · mm2 Total weight 36gr Outer diameter / Inner diameter / Profile Material (stator, rotor) Material mounting clamps , M2 58 /20 /10 mm Ultem™ polymer S.S. Electrical Supply voltage 5V ± 5% Interconnection Ø 3 mm Shielded cable Environment EMC Operating temperature range Relative humidity Shock endurance Vibration endurance Protection IEC 6100-6-2, IEC 6100-6-4 -40°C to +85°C <98 % - non condensing IEC 60068-2-27 100 g for 11 ms IEC 60068-2-6 20 g 10 – 2000 Hz IP 40 Performance Electrical Cycles – Fine/Coarse channels 32 / 3 Angular resolution (using 12 bit A/D conversion) 18 bits Static error (with offset compensation) < 15 mDeg (0.262mrad) Maximum operational speed Measurement range 1,500 rpm Unlimited rotation Output SSi absolute position BIT (build in tests , optional) Included (SSi version) www.netzerprecision.com The holistic structure of the Electric Encoder™ provides generous mounting tolerance, thus obviating the need for internal ball bearings. The lack of bearings and components such as flexible couplers, glass disc, light sources and detectors, along with very low power consumption makes the DS-58 encoder virtually failure free. The internally shielded, DC operated Electric Encoder™ includes an electric field generator, a field receiver, a sinusoidal shaped dielectric rotor, and processing electronics. The outputs signals of DS-58 Electric Encoder™ are analog Sine / Cosine representing the rotation angle,incremental or absolute position. Digital - SSi Interface (absolute position) DS-58[20] Synchronous Serial Interface (SSi) allows for serial transmission of absolute position data from the Electric Encoder™ responding to controller clock pulses. The Encoder and controller are linked by clock and data differential signal lines. Output signal parameters Signal latency ~250 μSec Output code Binary Serial output SSi Differential RS-422 Clock SSi Differential RS-422 Monoflop time 25 μSec Clock Frequency 0.5 ÷ 2.5 MHz Position update (Max) 30 KHz Electrical parameters Current consumption ~ 180 mA SSi - Wires color code # Name Color Function 1 Clock + Grey 2 Clock - Blue 3 Data - Yellow 4 Data + Green 5 GND Black Ground 6 +5V Red Power supply SSi Clock SSi Data n*T t1 T t3 Clock Data n t2 n-1 1 MSB 0 LSB Monoflop Recommendations n total number of data bits T clock period (sec) 1/T user defined clock frequency 0.5 ÷ 2.5 MHz (user defined) 2.5 MHZ t1 minimum time required for the encoder to freeze data and preset the shift registers before receiving the first rising edge to prompt the MSB t2 data transmission delay (increases with cable length) t3 equired delay to refresh position data between subsequent position -2- T/2 “0” on standard cable length >25usec Digital - SSi Interface (absolute position) DS-58[20] Software tools: Advanced calibration and monitoring options available by using the Electric Encoder Explorer software ( factory supplied ) using the NCP (Netzer Communication Protocol) , the Encoder Explorer enables: A. Calibration, built-in tests (BIT) and advanced setup. B. Proper mechanical mounting - setup and validation c. Calibration , offsets , CAA and user defined “zero”. -3- DS-58[20]Ordering DS - 58 - 32 - S- H - S 0 - 2 n n 0 - flying leads C- connector DS Product line 0 - Loose wires 250 mm S - shielded cable R - Strain relief & shielded cable OD mm Fine EC/R Outputs: S - Digital : SSi A - AqB +I 0 - Analog Resolution Binary Code Bit Resolution Decimal CPR Code Bit CPR F 17 131,072 O 17 128,000 G 18 262,144 P 18 256,000 Analog Code 0 Interconnection options -4- DS-58[20] Mounting options Rotor mounting options for stepped shaft End of shaft Mid shaft Installation kit’s CAT # End of stepped shaft : MA-DS58-20-004 Middle of steeped shaft : MA-DS58-20-002 End of smooth shaft : MA-DS58-20-001 Middle of smooth shaft : MA-DS58-20-003 DS-58 rotor 0.05mm S.S. Shims : DS-58-R-01 Netzer Cat No.: CB00014 30 AWG twisted pair (3) : 2 (30 AWG 25/44 tinned copper , 0.15 PFE to Ø0.6 ± 0.05 ). Cable: Three 30 AWG twisted pairs. 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