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Home Technologies Electromechanical Group Electromechanical - Industrial Electromechanical Industrial Knowledge Base Absolute Encoders & Drive Compatibility
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Absolute Encoders & Drive Compatibility

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An absolute encoder is a rotary feedback device that retains position information even when powered off. Its main use is to eliminate the need to "home" the axis when powered on. They can be divided into two kinds: single-turn and multi-turn. Single-turn absolute encoders, like normal (incremental) encoders, can still measure long distances (typically millions of revolutions). The difference is that single-turn absolute encoders retain their orientation when turned off, and multi-turn absolute encoders retain their orientation AND the number of revolutions they have gone.

There are many types of absolute position feedback devices. The newest are the BiSS-C and HyperfaceDSL.

BiSS-C absolute encoders are built into the Pseries motors and direct drive motors. They are compatible with the new ACR7000 servo, Pseries drives and the IPA servo drive controller.   BiSS-C is a lower priced high resolution absolute encoder option. For multi-turn functionality, it requires battery inline; without it, it's single-turn absolute. New! MPP/MPJ now available with Biss-C encoder with 4B option.  Note the multiturn resolution is 16bit (65,535 turns). See PM-DD catalog for those cables.

HyperfaceDSL is now available as the 6H option with the MPP/MPJ series servo motors providing easier installation with a single-cable design that has both power and feedback. This is compatible with the IPA servo drive controller and the new PSD.

**IPA15-HC is 6.3A so though it'd be able to run the encoder this would be a poor choice for high current motor.

Sine-Cosine ("SinCos") encoders are one very common technology. Within this branch of absolute encoders, two appear on Parker motors. These are the Heidenhain EnDat and the Stegmann Hiperface.

The Heidenhain EnDat is an option on MPP/MPJ motors.  It is compatible with the IPA servo drive controller, Aries servo drive and the Compax3 with the F12 feedback option. 

The Stegmann Hyperface is available on the SMN and MPP/MPJ motors. These encoders are compatible with the Compax3 drive with F10 feedback option (was F11).


Heidenhain model numbers are EQI-1331 (multiturn 8D is p/n 811814-08), ECI 1317 (9D single-turn) and EQI 1329 (6D multi-turn) and EQI 1331 (7D multi-turn). 

The 8D can be run in pure digital mode EnDat 2.2 but also has the analog commutation track for backwards compatibility as a 7D replacement (EnDat 2.1).

SICK (Stegmann) part numbers are SRS50 (single-turn) and SRM50 (multi-turn).

SM and BE motors are available as custom with absolute encoders. Note for applications only needing higher resolution there is the -L encoder (5000 lines = 20,000 counts/rev post quadrature resolution) which is a standard incremental encoder. The above absolute encoders are physically too large to fit inside the back of the 23 frame servo motors; but we can provide the Heidenhain EQI1130 within a SM23 and BE23. We've done so already on numerous custom requests.  The EQI1130 encoder is EnDat 2.1 and is 18 bit resolution (262,144 counts per revolution), multiturn with 4096 revs.

Encoder Turns Resolution IPA Cable P Series Cable Aries Cable Compax3 Cable
Heidenhain EnDat 8D Multi 19bits (524,288 ppu), 4096 turns IPAxx-HC F-1A2-xx

PDxx-P or PD-xxC

F-4A2-xx AR-xxAE, AR-xxPE, AR-xxCE F-1A2-xx F12 option F-2A2-xx
Heidenhain EnDat 7D* Multi 19bits (524,288 ppu), 4096 turns IPAxx-HC F-1A2-xx PDxx-P or PD-xxC F-4A2-xx AR-xxAE, AR-xxPE, AR-xxCE F-1A2-xx F12 option F-2A2-xx
Heidenhain EnDat 9D Single 17bits (131,072 ppu) IPAxx-HC F-1A1-xx PDxx-P or PD-xxC F-4A2-xx AR-xxAE, AR-xxPE, AR-xxCE F-1A1-xx F12 option F-2A2-xx
Heidenhain EnDat 6D** Multi 17bits (131,072 ppu), 4096 turns Not compatible   N/A Not compatible N/A Not compatible N/A F12 option F-2A2-xx
Stegmann Hyperface 6S Multi 16bit (65,536 ppu), 4096 turns Not compatible   N/A Not compatible N/A Not compatible N/A F10 option F-2B1-xx
Stegmann Hyperface 9S Single 16bit (65,536 ppu) Not compatible   N/A Not compatible N/A Not compatible N/A F10 option F-2B1-xx
Stegmann Hyperface 5D (SMN motors) Multi 16bit (65,536 ppu), 4096 turns Not compatible   N/A Not compatible N/A Not compatible N/A F10 option F-2B1-xx

 

Related FAQ:  Servo Cable Selection & Drawings and Motor Pinouts

 

* The 7D is no longer offered by Heidenhain. The 8D can be used in place. It was the same resolution as the 7D and works with the Aries and Compax3 without any changes at the drive necessary.

** The 6D is no longer offered by Heidenhain. The 7D can be used in place. With the Aries drives use the command ISIN -2 to lower the feedback resolution 2bits from 19bits to 17bits for replacements.

 10/20jh: ACR7V added, MPP 4B F-4A2 added

11/19jh: BissC added 

10/18jh: Changed Compax3 F11 to F10. F11 option is obsolete, directly replaced by F10.

3/18jh added BissC & 6H

3/15jh added 8D.

11/13 jh corrected 6S/9S resolution. added note on BE23/SM23.

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