So, how can I work out the proper labelling of the leads?Īs a sanity check, I verified the connectivity of all 9 leads (as they are labelled on the wires themselves, T1- T9): Some of the leads must be improperly labeled, causing the motor to fight itself.If there was a dead winding, there would be no continuity there.If there was a short, the over-current protection would happen regardless of motor speed.I suspected that one of the motor coils might be burned out or shorted, but a simple continuity test shows that none of the leads are shorted to ground, and there is continuity between each pair of leads as you'd expect from this diagram. I verified that all 3 terminals of the VFD are providing voltage. At 10Hz, the over-current protection in the VFD is triggered. At 5Hz on the VFD, the motor runs in a rough, bumpy manner and I can reverse the rotation of the shaft simply by grabbing it and spinning it the other way by hand (which it then maintains indefinitely). With the power off, the motor rotates freely and easily by hand. I connected my new-in-box 3-phase motor to my new-in-box VFD, following the instructions in both manuals and the wiring diagram on the name plate (low voltage configuration).
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