Hitachi J300U Series instruction manual Hrw-Oj

Symptom		Probable cause						Countermeasure
The rpm		After checking the wiring of						Replace the frequency setter.
of the		the frequency setter, the rpm still
motor		does not increase when the setter
will not		is turned.
increase.
		Are terminals 7 and CM1, terminal 6						Turn off terminal 7 and 6. (When the
		and CM1 ON (Sink type)?						frequency and multistage speed are fixed at
								a given frequency, the speed potentiometer
								will be invalid.)
		Is the load too great?						Decrease the load.
								When the load is too great, the limiting
								function will be activated, so that
								the rotational speed will be lower than
								the setting.
The rpm		Is the maximum frequency setting						Check the speed-change ratio.
of the		correct?
motor		Are the number of motor poles,
does not		the gear ratio, and pulley ratio correct?
match the
inverter.
The data	The data is	The STN terminal is turned ON and the						Turn the STN terminal OFF.
is	returned to	power is turned on.						Input the data again.
incorrect.	the initial	The input terminals 1 to 5 are turned						Replace the logic PCB.
	setting.	ON and then power is turned on.
	The data has	Was the power turned off without						Input the data and push the
									FUNC		key once.
	not changed.	pushing the			key after the data
			FUNC
		was changed with					keys.
				1		2
		The data is memorized upon power off.						Take six seconds or more when turning power
		Is the time from power OFF to ON less						OFF and ON after changing the data.
		than six seconds?
	Data copied	Is the power turned off for five seconds						Copy again and turn the power off five
	by the copy	or more after the display changed						seconds or more after copying.
	unit	from REMT to INV.
	is not input.	(HRW-OJ)
The data	Frequency	The change of the terminal mode and						Confirm the change in		setting mode.
is not	setting can	digital operator mode were correct?
changed.	not be
	changed.
	Run and
	stop can not
	be done.
	The data can	Is the input terminal SFT ON ?						Turn the SFT terminal OFF.
	not be	Is the software lock mode set at MD2						Turn the switch OFF.
	changed.	or MD3 ?
		Note: If software lock is ON because of
		use with an explosion proof motor,
		do not release the software locks.

9-7