Now that the local temp is getting consistently warm the guys at work are trying to start-up the cooling towers for a hospital. One of the motors for a pump runs for about 10 mins. and then shuts down on ground fault as seen in the display on the Danfoss VFD that is controlling it. Since it takes roughly ten minutes after the pump motor starts for this ground fault to occur I suspect it must be the motor insulation. So far we've tested the conductors between the motor and the VFD with a Fluke 1507 megohmmeter and they appeared to be fine. Tomorrow we will test the motor. Anyone have other suggests or experience troubleshooting Danfoss VFD's? Thank-you.
Last edited by Potseal; 05/03/17 12:45 AM.