I had a VFD failure on a Grinder and I replaced the VFD with the same Model and same paramters. The Rotor does not turn even though I measure voltage at the motor. As I increase the freq the voltage increases accordingly. The motor is rated for 460VAC and I increased the freq until the voltage reached 380VAC. The motor sounds like its turning but upon inspection it is not
The Rotor spins freely and is not locked
1.9 ohms between all three legs resistance
Passed a Megometer test

Insalled the drive on an identical machine with the same Model 460VAC Motor and the drive work s fine and the motor rotates????? HMMMM Strange?