georgerepard
New User
- Location
- oregon
- Occupation
- journeyman electrician
i have 1 480v 3/0 motor on a powerflex 525 vfd. it is running a progressive cavity pump. the motor starts to ramp up even when the commanded frequency is at 25hz. the motor will ramp up and down from 25- 60.77 hz and i get an overvoltage fault. i have tested the motor and programmers have checked the plc programming and the system is running as set. i changed the drive out and still same problem. the plc will command the motor off but it continues to run away at 60hz. then the brake locks down and i get a motor stall, of course. so i swapped the motor and everything ran perfectly as commanded to. what could cause this motor to react like this?