Hitachi Understanding L300P Error Codes and Protective Functions in Inverters

PROTECTIVE FUNCTIONS

		Display on digital	Display on remote
Name	Cause(s)		operator/copy unit
		operator	ERR1****
	The inverter output was short-circuited, or the motor	While at constant speed	OC.Drive
Over-current		During deceleration	OC.Drive
	shaft is locked or has a heavy load.
protection	These conditions cause excessive current for the	During acceleration	OC.Accel
	inverter, so the inverter output is turned off.	Others	Over.C
Overload	When a motor overload is detected by the electronic thermal function, the inverter		Over.L
protection(*1)	trips and turns off its output.
Braking resistor	When the regenerative braking resistor exceeds the usage time allowance or an over-voltage caused by the		OL.BRD
overload protection	stop of the BRD function is detected, the inverter trips and turns off its output.
Over-voltage	When the DC bus voltage exceeds a threshold, due to regenerative energy from		Over.V
protection	the motor, the inverter trips and turns off its output.
EEPROM error(*2)	When the built-in EEPROM memory has problems due to noise or excessive temper-		EEPROM
	ature, the inverter trips and turns off its output.
Under-voltage	A decrease of internal DC bus voltage below a threshold results in a control circuit fault. This condition can		Under.V
error	also generate excessive motor heat or cause low torque. The inverter trips and turns off its output.
CT(Current	If a strong source of electrical interference is close to the inverter or abnormal operations occur in the built-		CT
transformer) error	in CT(Current transformer), the inverter trips and turns off its output.
CPU error	When a malfunction in the built-in CPU has occurred, the inverter trips and turns off		CPU1
	its output.
External trip	When a signal to an intelligent input terminal configured as EXT has occurred, the		EXTERNAL
	inverter trips and turns off its output.
USP error	An error occurs when power is cycled while the inverter is in RUN mode if the Unattended Start Protection		USP
	(USP) is enabled. The inverter trips and does not go into RUN mode until the error is cleared.
Ground fault	The inverter is protected by the detection of ground faults between the inverter output		GND.Flt.
	and the motor during power-up tests. This feature protects the inverter only.
Input over-voltage	When the input voltage is higher than the specified value, it is detected 60 seconds		OV.SRC
protection	after power-up and the inverter trips and turns of its output.
Instantaneous	When power is cut for more than 15msec., the inverter trips and turns off its output. If power failure contin-		Inst.P-F
power failure	ues, the error will be cleared. The inverter restarts if it is in RUN mode when power is cycled.
Inverter thermal	When the inverter internal temperature is higher than the specified value, the thermal sensor in the inverter		OH FIN
trip	module detects the higher temperature of the power devices and trips, turning off the inverter output.
Gate array error	Communication error has occured between CPU and gate array.		GA
Missing phase	One of three lines of 3-phase power supply is missing.		PH.Fail
IGBT error	When instantaneous over-current has occurred, the inverter trips and turns off its		IGBT
	output to protect main circuit element.
Thermistor error	When the thermistor inside the motor detects temperature higher than the specified		TH
	value, the inverter trips and turns off its output.
Expansion card 1		–	OP1 0-9
connection error
	An error has been detected in an expantion card or at its connecting terminals.
Expansion card 2
		–	OP2 0-9
connection error
Out of operation	Due to insufficient voltage, the inverter has turned off its output and been trying to		UV.WAIT
due to under-voltage	restart. If it fails to restart, it goes into the under-voltage error.

(*1)You can clear the error by pressing the Start / Reset key 10 seconds after the trip occurred.

(*2)If an EEPROM error occurs, be sure to confirm the parameter data values are still correct.

How to access the details about the present fault

		Output frequency	Motor current	Voltage between	Cumulative inverter	Cumulative power-on
Error code	Status at trip point	at trip point	at trip point	P(+) and N(–) at trip point	operation (run) time	time at trip point
					at trip point

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