Hitachi J300U Series instruction manual Appropriate value

			Symptom
Circuit breaker(MCB)	Electromagnetic contactor (Mg)	Thermal relay(THRY)	Display on the	Failure alarm relay		How to reset
			digital operator		Cause
							Check	Countermeasure
			(display on the
			LCD of the		(explanation
			remote operator)		of message)
		●	—	—	—	C	Check for an overload.	Lower the load ratio.
							Check whether the thermal	Set the thermal relay to an
							relay is set to an appropriate	appropriate value.
							value.
●			—	—	—	B	Check whether there is a	Remove the short or ground
							short or ground fault in the	fault.
							power supply.
							Check whether the MCB	Increase the MCB capacity.
							capacity is sufficient.
							Check whether the inverter	Repair the inverter module or
							module or converter module	converter module.
							is defective.
	●		—	—	Power outage	B	Check for a power outage.	Restore the power supply to
								normal.
							Check whether the MCB or	Replace the MCB or Mg.
							Mg has a poor contact.

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