Search results

Forgot the CT's are in parallel with those resistors so the resistance measured at R10 and R11 may be right. The wire that fell off was probably the problem! Bad solder joint or it was vibrating and gradually breaking the strands of the wire over time.

Did you have loads connected when you closed the contactor? If so what and how much load? Did you have a chance to check the resistance of R10, R11 and R12 with the set OFF?

Does the engine bog down indicating a heavy load before it throws the fault? With the set OFF you could try measuring the resistance of the 3 resistors. They should be 7.5 ohms.

The voltages at the burden resistors look good. The K8 Overload / Short Circuit module monitors these 3 voltages to determine if there is either an overload or short circuit condition. Overload starts to occur if any one of the 3 voltages is 7.5 volts AC or higher (133% rated load). Short...

Get the set properly grounded first as Ray indicated. An overload occurs when the set "thinks" it sees a load of 425% on any output leg. Poor contact inside the AM/VM switch and the Voltage/Phase reconnection switch can cause false Overload and Short Circuit faults. With the set OFF I'd...