I'm trying to set up a high frequency spindle, 220 V, 8 amp, 400 HZ, 24,000 RPM using single phase 220 power through this VFD:Hitachi SJ200-015NFU. I'm getting lots of trips, mostly on deceleration. I can get it to not trip only with very sensitive setting of deceleration time, and even then it's not reliable -- it will trip maybe 1/3 of the time. Ideal time to set decelration ranges from 2.5 seconds at 272 HZ, to 4 seconds at 385 HZ. The slower I start from the more reliable the stop without tripping. If I set the deceleration time too long it will trip when it reaches about 40 HZ -- in other words pretty slow. It will then give me error message 02 "overcurrent during deceleration", probable cause ranging from "inverter waas short circuited" to "Load too heavy". If I set it for too short a time, it will trip early in its deceleration, and it will generate code E07, "Over voltage protection", probable cause -- "DC bus voltage exceeds a threshhold due to regenerative energy from motor. " It also trips sometimes on start up, giving me the E02 or E03 (overcurrent on acceleration) error message. Its much more likely to trip on start up if it didn't trip on finish the preceding cycle.
Motor seems to spin fine, and is quiet in operation. I"m not cooling it as well as I"d like, getting 3-4 GPM of water through the spindle, and so only making brief tests of a few seconds.
Any suggestions for what's happening here and how to fix? The manual is more than a little over my head, though I can follow how to implement parameter changes. I just can't figure out which are most likely to help. The tech help at Hitachi was pretty much worthless, just blaming my motor with no suggestions on fixing the problem.