Hitachi J300U Series instruction manual Trouble shooting

9.2Trouble shooting

Symptom						Probable cause					Countermeasure
The	The inverter	• Is power being supplied to terminals						• Check terminals R(L1), S(L2), T(L3), U(T1),
motor	outputs		R(L1), S(L2) and T(L3)?					V(T2), and W(T3).
will not	U(T1), V(T2)		If it is, the POWER lamp should be on.					• Turn on the power supply.
run.	and W(T3)
	are not	• Is the display E * * ?						• Press			and check the content.
									2	1
	supplying
								Then press the reset key.
	voltage.
		• Is the operation instruction RUN ON?						• Set to ON.
		• Is terminal FW (or REV) connected to						• Connect terminal CM1 to terminal FW
		terminal CM1?						(or REV) on the printed-circuit board.
								(When the terminal mode is selected.)
		• Has the frequency setter been turned on						• Push down keys and set.
								• When terminal mode is selected, connect the
		by pushing				FUNC	key and then	potentiometer to H, O, and L, and then set.
								• In the case of the internal interface power
			2	1	key.			source, short the terminals P24 and PLC or
								CM1 and PLC.
		• Are the printed-circuit board terminals
								• In the case of the external interface power
			H, O and L connected to
								source, turn the PLC terminal on.
			the potentiometer?
		• Are the terminals connected to the
			external and internal interface power
			source the terminal mode is selected?
		• Has RS/FRS been left ON?						• Release reset.
								• Contact FRS.

•Is the mode key setting correct? • Read the explanation of the function mode once again. (Page 7-12) F9 frequency/run commanding method

	Inverter	• Has the motor seized or is the load too	• Release seizure or lighten the load.
	outputs	great?	• Test the motor independently.
	U(T1), V(T2)
	and W(T3)
	are supplying
	voltage.
	The optional	• Are the remote operator and equipment	• Check the operation of the optional remote
	remote	body switched coorrectly ?	operator. (copy unit)
	operator is	• Is the setting of the DIP switch on the
	used.	back of the remote operator correct ?
			ON	1 2 3 4
	(copy unit)				1: OFF
			OFF
					2: ON (Same as VWA, J100)
The		• Are the connections of output terminals	• Make the connections according to the phase
direction		U(T1), V(T2) and W(T3) correct?	sequence of the motor. (In general, forward
of the		• Is the phase sequence of the motor	should be in the sequence: U(T1), V(T2)
motor is		forward or reverse in respect to U(T1),	and W(T3).)
reversed.		V(T2) and W(T3)?
		• Are the terminals on the printed-circuit	• Short the FW terminal for forward rotation or
		board correct?	the intelligent input terminal 8 (the intelligent
			input terminal 8 is allocated to run command
			REV by initialization at factory before
			shipment) for reverse rotation to the CM1
			terminal (Sink type).

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