Recent content by lottis

The current is balanced across each phase +/- 2 amps at 105amps 50hz. The vfd shows the current for each phase and i also checked with a clip on ammeter. I also checked winding resistance and insulation resistance which both check out fine. The dc bus is stable and the vfd output voltages are...

No not like a spark, a clang but not loud, spoon on spoon is the best description i can think of. When i heard it first i would have sore there was something loose in the motor, like a balance or something, but nothing loose was found. If these was a short to Earth or across a winding the vsd...

Hi guys I have been testing a brand new 250kw 3 motor wired in delta. I have it connected to a 170 amp vfd with no load for testing. It draws 105 amps at 50hz and is balanced. Intermittently the motor makes a strange that i have not heard before. It sounds like a spoon taping another...