Hitachi J300U Series instruction manual Ground fault on

			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)
			E 1 4	●	Ground fault on the	A	Check the wiring between the	Correct the portions having
					output side of the		inverter and motor and also	a ground fault.
			( G N D . F l t )
					inverter		check the motor for a ground
							fault. (Use a megger.)
			E 1 5	●	Excessive received	A	Check whether an	• Lower the voltage to be
					voltage		excessive voltage was	received.
			( O V . S R C )
							received during an	• Reduces fluctuations of
							operation other than	the received voltage.
							deceleration.	• Install an AC reactor on
								the input side.
			E 1 6	●	Defective power	A	Check whether the voltage	Restore the power supply
					supply (instantaneous		is lowered.	to normal.
			( I n s t . P - F )
					power outage)
							Check whether the MCB or	Replace the MCB or Mg.
							Mg has a poor contact.
			E 1 7	●	Incorrectly connected	A	Check the connectors and	Repair the defective
					option-1 PC board		other connections for	connections.
			( N G . O P 1 )
							abnormal conditions.
			E 1 8	●	Incorrectly connected	A	Check the connectors and	Repair the defective
					option-2 PC board		other connections for	connections.
			( N G . O P 2 )
							abnormal conditions.
			E 1 9	●	Defective option-1 PC	A	Refer to the instruction
			( O P 1 )		board		manual.
			E 2 0	●	Defective option-2 PC	A	Refer to the instruction
			( O P 2 )		board		manual.
			E 2 4	●	Defective power	A	Check the power supply	Repair the abnormal
					supply (missing phase)		connections for abnormal	portions.
			( P H . F a i l )
							conditions.
							Check whether the MCB or	Replace the MCB or Mg.
							Mg has a poor contact.
			E 3 1	●	(NOTE 1) Failure detected	A	Check whether a load was	Do not change loads
					by a detector in the power		changed rapidly.	rapidly.
			( P M . D r i v e )
					module while the motor
							Check whether there is a	Check whether the output
					was running at a constant
					speed, or excessive tem-		shorted output or ground	lines or motor is shorted.
					perature rise in the inverter		fault.
			E 3 2	●	(NOTE 1) Failure detected	A	Check whether the speed	Set a longer deceleration
					by a detector in the power		was decreased rapidly.	time.
			( P M . D e c e l )
					module during motor
							Check whether there is a	Check whether the output
					deceleration, or excessive
					temperature rise in the		shorted output or ground	lines or motor is shorted.
					inverter		fault.

NOTE 1: The failures detectable in the power module are overcurrents, excessively hot main devices, and insufficient voltages from the gate circuit power supply.

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