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Industrial drive with SSI input?

Geoff At Home
Can anybody suggest an industrial drive, 10-30kW range, that can be used to control a permanent magnet motor with an absolute encoder providing SSI angle data?



I am aware of alternative protocols such as HTL or sin/cos. In this application we have an existing encoder with only SSI protocol and would ideally use a drive that will achieve closed-loop control from that signal without further conversion.
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    Thanks Bill. I had already spoken to several blue-chip drive manufacturers before posting and received far from certain statements from them all. There is no way I would buy new hardware of such value just to validate a claim that "it should work" which is the best I could achieve from the various UK technical support offices.

    There is a fundamental difference between a drive being able to receive an SSI signal and report the value externally (e.g. to a PLC) and on the other hand, being able to use the SSI data internally for closed-loop control. Quite surprising to learn that it is still preferable from the drive manufacturers' point of view to digitise a sin/cos signal rather than receive on-demand an absolute digital value via SSI. We tripped up on this point.

    Our chosen solution has been to add a converter module from SSI to HTL (A/B/Z). This should enable us to achieve almost what we aimed for when specifying the drive and encoder several years ago. It is being implemented now.
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    Thanks Bill. I had already spoken to several blue-chip drive manufacturers before posting and received far from certain statements from them all. There is no way I would buy new hardware of such value just to validate a claim that "it should work" which is the best I could achieve from the various UK technical support offices.

    There is a fundamental difference between a drive being able to receive an SSI signal and report the value externally (e.g. to a PLC) and on the other hand, being able to use the SSI data internally for closed-loop control. Quite surprising to learn that it is still preferable from the drive manufacturers' point of view to digitise a sin/cos signal rather than receive on-demand an absolute digital value via SSI. We tripped up on this point.

    Our chosen solution has been to add a converter module from SSI to HTL (A/B/Z). This should enable us to achieve almost what we aimed for when specifying the drive and encoder several years ago. It is being implemented now.
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