Bugman1400
Senior Member
- Location
- Charlotte, NC
I have 6 fan motors that are controlled by one contactor. Each fan motor is a 3PH 208V 1/3HP motor and around 1.21A FLA. So, 6 healthy running motors draw about 6 x 1.21 = 7.26 amps. Besides a bearing failure, I would expect another failure mode would be a lost phase in the motor. So, what would be the current draw for 1 motor failure. I am only measuring the B-phase (w/ clip-on CT) so, I would need to know the current if the B-phase was on the same phase as the failure or if B-phase is not on the same as the failure. IOW, I would expect the B-phase current to rise if the failure is on A-phase.