Difference between revisions of "Using SSI encoder"

Revision as of 11:51, 8 February 2017

SSI (Synchronous Serial Interface) is a digital protocol used by many encoder feedback device manufacturers. IONI Pro servo drive supports SSI encoders starting from firmware version 1.6.1.

SSI support details

As SSI is loosely defined standard, drive's SSI support does not cover all possible variations of the protocol. The following list includes currently supported SSI encoders:

• AMS 12 bit SSI encoders

Current firmware version limitations:

• No absolute encoder information is utilized, motor still needs to do Phasing a.k.a. phase search and Homing to get absolute operation.

Wiring SSI encoder

Wiring of SSI depends on the variant of SSI protocol present.

AMS SSI encoder chips

AMS SSI encoders are wired following way to IONI encoder connector:

Refer to IONI & IONICUBE user guide for more info on wiring encoders.

Configuration

BiSS parameters in Granity. Example settings for Hengstler AD36 (AD36/1219AF.0XBI0:5653).

To configure SSI, use Granity version 1.11.1 or later. Configuration steps:

1. Find out encoder MT and ST resolutions from encoder manufacturer's data sheet
2. Select SSI Encoder from Feedback deviceFBD
3. Select SSI type from Serial encoder typeFBS
4. Set number of MT and ST bits into parameters [FBST] and [FBMT]. If MT not specified in encoder data sheet, set it zero.