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Hitachi Industrial Equipment Systems Co., Ltd.

Error Codes

Name Cause(s)
E01 Over-current event
while at constant speed
The inverter output was short-circuited, or the motor shaft is locked or has a heavy load. These conditions cause excessive current for the inverter, so the inverter output is turned OFF.
The dual-voltage motor is wired incorrectly.
E02 Over-current event
during deceleration
E03 Over-current event
during acceleration
E04 Over-current event
during other conditions
E05*1 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*2 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*2 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*2 Ground fault The inverter is protected by the detection of ground faults between the inverter output and the motor upon during power up 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 system error When the thermal sensor in the inverter module
is not 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.
E25 Main circuit error (*3) The inverter will trip if the power supply establishment is not recognized because of a malfunction due to noise or damage to the main circuit element.
E30*2 Driver error An internal inverter error has occurred at the safety protection circuit between the CPU and main driver unit. Excessive electrical noise may be the cause. The inverter has turned OFF the IGBT module output.
E35 Thermistor When a thermistor is connected to terminals [5] and [L] and the inverter has sensed the temperature is too high, the inverter trips and turns OFF the output.
E36 Braking error When "01" has been specified for the Brake Control Enable (b120), the inverter will trip if it cannot receive the braking confirmation signal within the Brake Wait Time for Confirmation (b124) after the output of the brake release signal.
E37*3 Safe Stop Safe stop signal is given.
E38 Low-speed
overload protection
If overload occurs during the motor operation at a very low speed, the inverter will detect the overload and shut off the inverter output.
Name Cause(s)
E40 Operator connection When the connection between inverter and operator keypad failed, inverter trips and displays the error code.
E41 Modbus communication error When “trip” is selected (C076=00) as a behavior in case of communication error, inverter trips when timeout happens.
E43 EzSQ invalid instruction The program stored in inverter memory has been destroyed, or the PRG terminal was turned on without a program downloaded to the inverter.
E44 EzSQ  nesting count error Subroutines, if-statement, or for-next loop are nested in more than eight layers
E45 EzSQ instruction error Inverter found the command which cannot be executed.
EzSQ user trip (0 to 9) When user –defined trip happens, inverter trips and displays the error code.
Option error The inverter detects errors in the option board mounted in the optional slot. For details, refer to the instruction manual for the mounted option board.
E80 Encoder disconnection If the encoder wiring is disconnected, an encoder connection error is detected, the encoder fails, or an encoder that does not support line driver output is used, the inverter will shut off its output and display the error code shown on the right.
E81 Excessive speed If the motor speed rises to "maximum frequency
(A004) x over-speed error detection level (P026)" or more, the inverter will shut off its output and display the error code shown on the right.
E83 Positioning range error If current position exceeds the position range (P072-P073), the inverter will shut off its output and display the error code.
Reset operations acceptable 10 seconds after the trip.
The inverter will not accept any reset command after an EEPROM error (E08), CPU error (E11), Ground fault (E14) or Driver error (E30) occurs with error code displayed. Turn off the inverter power once. If error is displayed when the inverter power is turned on subsequently, the internal memory device may have failed or parameters may have not been stored correctly. In such cases, initialize the inverter, and then re-set the parameters.
Reset cannot be released with the STOP/RESET key. Please reset it with the inverter power or reset terminal (18:RS).

How to access the details about the present fault

How to access the details about the present fault


Indicated inverter status could be different from actual inverter behavior.
e.g. When PID operation or frequency given by analog signal, although it seems constant speed, acceleration and deceleration could be repeated in very short cycle.

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