Greg Dake
Member
Yes, we did. We overlooked 2 things. We put a 25HP 480VAC motor on a VFD. We didn't realize it was a 2 pole motor (3600RPM). The VFD was setup for 1800RPM (4-pole). The drive ran at 60Hz, but at the incorrect base speed for the motor. Normally shouldn't be an issue, but the motor wasn't an inverter rated motor. Cooked the winding insulation, took about a week.
My question is: Did the motor fail because the incorrect RPM was set on the VFD OR was it due to the motor wasn't an inverter rated motor OR was it because the motor was running at something other than 3475 RPM?
TIA,
Greg
P.S. The drive is in basic Volts/Hz mode....
My question is: Did the motor fail because the incorrect RPM was set on the VFD OR was it due to the motor wasn't an inverter rated motor OR was it because the motor was running at something other than 3475 RPM?
TIA,
Greg
P.S. The drive is in basic Volts/Hz mode....