I have a 7.5 HP TEFC Motor on a hot high pressure washer. My 3 phase power is generated from a rotary converter. This motor is not happy with my home made power and trips the heaters. Normal load is about 9 Amps under load but the one leg pulls 13-14A and trips the heaters. The contactor is a small GE unit with integral heaters and I have them set on max which is 14A IIRC.
The motor checks out just fine at the local motor shop. Coil resistances are all equal. There are no excessive mechanical loads on the motor. I have narrowed it to the current overload on one leg only.
I'll test with an added load on the RPC to see if that helps, but in the mean time; can I use a capacitor to adjust the current draw on that leg down? If so what MF values? I think that the caps in my surplus are all 600V rated.
Thanks,
Bob.