Servo Purchase Recommendations, Yaskawa?

Thank you for the links. I'm looking for the single phase drives which seem to be unicorns.

I did see a couple places that mentioned some of the 3 phase drives can actually run on single phase but there was no mention of which ones.

For drives under 4kW or so, the inputs generally use passive rectification (as opposed to active PFC), so they are fine on either single phase or three phase as long as the phase to phase voltage is appropriate - they don't know or care either way. The input rectifier bridge has to work slightly harder with single phase, as you are only using 4 diodes instead of 6 but they are typically rated for that application anyway. Besides, unless you are running your drives at full rated power continuously, you won't be pushing them. Looking at the Sigma 5 manual, Yaskawa don't require derating for operation on single phase. 

I didn't find that in the manual. It will not lists a handful of small servo drives that can work on single phase. Did see this though:

That's helpful. So you need to check that your model has the Pn00B.2 parameter and it's a 200V Class drive if you really are stuck with 3-ph equipment. 

Most of the drives I've used have been 1-ph out of the box (Yaskawa VFD and servo) or will tolerate either 1-ph or 3-ph (Lichuan and DMM Tech servos). 

Almost all 3 phase drives can and will work with only 1 phase, but it is recommended to limit the output power to 70% to be on the safe side, or not to push the input rectifier over it's limit.
Most will do full power without issues, tested several of them, mostly some older Fuji.

That was my understanding also but the manual for these ones is specific. It's $4000US purchase that I would hate to take a chance on the 3ph working on single despite the manual warning.