I just wired up my new TECO drive to this 3ph motor. The motor spins and runs at variable speeds as expected. But ...
1) At low frequencies, under 8 hz or so, the motor's motion is noticeably jerky. I can't tell if the shaft is running smoothly or not, but I can feel a definite "pulsing" when my hand is on the body. Is this a normal effect of such a low frequency?
2) The motor seems to take a long time to come up to speed. Not bad, but not what I'm used to on my Powermatic wood lathe which also uses a VFD and 3ph motor. The frequency display on the drive shows the frequency slowly moving up and down whereas on the lathe just shows the target frequency. Is the drive slowly ramping the frequency instead of just producing it straight out? If so, can/should this behavior be changed?
3) If I flip the reverse switch on the lathe, it very quickly slows down and starts going the other way. If it's going slowly enough, the change is almost instantaneous. On this motor, however, if the motor is moving slowly it will slowly stop and then slowly come up to speed in the other direction. If it's initially going at a good clip, it'll slow down and then continue slowly in the same direction. Do I just have the wrong kind of motor for quick reverse?
Any and all help would be greatly appreciated.