Hitachi Comprehensive Error Codes and Fault Code List for Inverter Systems

Error Codes

An error code will appear on the display automatically when a fault causes the inverter to trip. The following table lists the cause associated with the error.

Error	Name			Cause(s)
Code
E01	Over-current event while at constant			The inverter output was short-circuited, or the motor shaft
	speed			is locked or has a heavy load. These conditions cause
E02	Over-current event during			excessive current for the inverter, so the inverter output is
	deceleration			turned OFF.
E03	Over-current event during			The dual-voltage motor is wired incorrectly.
	acceleration
E04	Over-current event during
	other conditions
E05	Overload protection		When a motor overload is detected by the electronic
				thermal function, the inverter trips and turns OFF its
				output.
E06	Braking resistor overload protection			When the BRD operation rate exceeds
				the setting of "b090", this protective
				function shuts off the inverter output and
				displays the error code.
E07	Over-voltage protection		When the DC bus voltage exceeds a threshold, due to
				regenerative energy from the motor.
E08	EEPROM error		When the built-in EEPROM memory has problems due to
				noise or excessive temperature, the inverter trips and
				turns OFF its output to the motor.
E09	Under-voltage error		A decrease of internal DC bus voltage below a threshold
				results in a control circuit fault. This condition can also
				generate excessive motor heat or cause low torque. The
				inverter trips and turns OFF its output.
E10	Current detection error			If an error occurs in the internal current
				detection system, the inverter will shut off its
				output and display the error code.
E11	CPU error			A malfunction in the built-in CPU has occurred, so the
				inverter trips and turns OFF its output to the motor.
E12	External trip		A signal on an intelligent input terminal configured as EXT
				has occurred. The inverter trips and turns OFF the output
				to the motor.
E13	USP			When the Unattended Start Protection (USP) is enabled,
				an error occurred when power is applied while a Run
				signal is present. The inverter trips and does not go into
				Run Mode until the error is cleared.
E14	Ground fault		The inverter is protected by the detection of ground faults
				between the inverter output and the motor upon during
				powerup tests. This feature protects the inverter, and does
				not protect humans.
E15	Input over-voltage			The inverter tests for input over-voltage after the inverter
				has been in Stop Mode for 100 seconds. If an
				over-voltage condition exists, the inverter enters a fault
				state. After the fault is cleared, the inverter can enter Run
				Mode again.
E19	Inverter thermal detection			When the thermal sensor in the inverter module is not
	system error			connected.
E21	Inverter thermal trip		When the inverter internal temperature is above the
				threshold, the thermal sensor in the inverter module
				detects the excessive temperature of the power devices
				and trips, turning the inverter output OFF.
E22	CPU communication error		When communication between two CPU fails, inverter
				trips and displays the error code.
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