Matching existing AC servos to new drives.

The drives should have a normal encoder output on one of the connectors, with 2000 PPR so you can use that as feedback.
If the drives work, use them, they are very good and after wiring the tuning should take about 5 minutes in total.
On the other side, changing the drives would require changing motors, or changing the encoders on the motors together with commutation that is built in with the encoders.
The original encoders output incremental signals on all 3 outputs that change the distance between pulses in corelation to one and the other, something like looking at a 3 phase PWM signal.
Also the commutation signals, the Argon drives from Granite devices complained about signals, forgot what exactly but those drives can work with no commutation, so all was good.
IF you plan on changing the encoders, most probably you will have to destroy them as i could not get them out.
Again, try to use the original drives, they work perfectly with Mesa 7i77 and Linuxcnc.

DaOne wrote:

I have a Kitamura Mycenter 0 I am contemplating on retrofitting. I looked into the drives (CACR-IR-151515EBY33) and they appear to be incompatible with Mesa hardware.

In what way are they incompatible?

If they really are incompatible with Mesa, then perhaps General Mechatronics have something?

The drives require a PWm to drive 2 out of 3 phases. Presumably the other phase is calculated as what is left over.

Mesa have a 3-phase PWM module, look for firmwares for the 7i39 as an example.

(you would just ignore the PWMW output of the card)

Would it be best to use the Three Phase PWM module, just in case the drives care about the relative phase of the PWM? Or is that unlikely?