Hitachi L200 Drive

Hitachi L200 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
E01

Over-current event while at constant speed
Cause: 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.



Remedy:

  • Check for short circuits at the output.

  • Ensure the motor shaft is not mechanically locked.

  • Reduce the load if it is too heavy.

  • Check motor wiring (especially for dual-voltage motors).

  • Press the Stop/Reset key.
E02

Over-current event during deceleration
Cause: The inverter output was short-circuited, motor shaft is locked, heavy load, or incorrectly wired motor. (Excessive current detected during deceleration).



Remedy:

  • Check for short circuits.

  • Increase deceleration time (make it slower).

  • Check braking resistor/unit if installed.

  • Press the Stop/Reset key.
E03

Over-current event during acceleration
Cause: The inverter output was short-circuited, motor shaft is locked, heavy load, or incorrectly wired motor. (Excessive current detected during acceleration).



Remedy:

  • Check for short circuits.

  • Increase acceleration time.

  • Check if motor is stalled.

  • Press the Stop/Reset key.
E04

Over-current event during other conditions
Cause: The inverter output was short-circuited, motor shaft is locked, heavy load, or incorrectly wired motor. (Detected in conditions other than constant speed, accel, or decel).



Remedy:

  • Check for general short circuits or ground faults.

  • Check motor wiring.

  • Press the Stop/Reset key.
E05

Overload protection
Cause: When a motor overload is detected by the electronic thermal function, the inverter trips and turns OFF its output.



Remedy:

  • Reduce the motor load.

  • Check the electronic thermal setting parameter.

  • Allow the motor to cool down.
E07

Over-voltage protection
Cause: When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor.



Remedy:

  • Increase deceleration time.

  • Install a dynamic braking unit/resistor if regenerative energy is high.

  • Check input voltage.
E08

EEPROM error
Cause: 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.



Remedy:

  • Check for electrical noise sources near the inverter.

  • Check ambient temperature.

  • Confirm parameter data values are correct (see Note).

  • Cycle power (OFF/ON) and Reset.
E09

Under-voltage error
Cause: 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.



Remedy:

  • Check the input power supply voltage.

  • Check for loose power connections.

  • Ensure power source capacity is sufficient.
E11 / E22

CPU error
Cause: A malfunction in the built-in CPU has occurred, so the inverter trips and turns OFF its output to the motor.



Remedy:

  • Cycle power to the inverter (Reset).

  • Check for excessive noise interference.

  • If the error persists, the unit may require service.
E12

External trip
Cause: A signal on an intelligent input terminal configured as EXT has occurred. The inverter trips and turns OFF the output to the motor.



Remedy:

  • Investigate the external device connected to the EXT terminal.

  • Clear the external fault condition.

  • Reset the inverter.
E13

USP (Unattended Start Protection)
Cause: When 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.



Remedy:

  • Remove the Run signal (turn switch OFF) before applying power.

  • Clear the error by resetting the inverter.
E14

Ground fault
Cause: The inverter is protected by the detection of ground faults between the inverter output and the motor during powerup tests.



Remedy:

  • Check wiring between inverter and motor for damage.

  • Check motor for insulation failure (ground fault).

  • Note: This feature protects the inverter, not humans.
E15

Input over-voltage
Cause: 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.



Remedy:

  • Check input power supply voltage.

  • After the fault is cleared, the inverter can enter Run Mode again.
E21

Inverter thermal trip
Cause: When the inverter internal temperature is above the threshold, the thermal sensor detects excessive temperature of power devices and trips.



Remedy:

  • Check if the cooling fan is working.

  • Check for blocked heatsink or air vents.

  • Ensure ambient temperature is within specifications.
E30

Driver error
Cause: 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.



Remedy:

  • Check for external noise sources (contactors, relays).

  • Verify proper grounding.

  • Reset the inverter.
E35

Thermistor
Cause: When a thermistor is connected to terminals [6] and [L] and the inverter has sensed the temperature is too high.



Remedy:

  • Check the motor temperature.

  • Check thermistor wiring and connections.

  • Allow motor to cool down.
E60

Communications error
Cause: The inverter’s watchdog timer for the communications network has timed out.



Remedy:

  • Check communication cables and connections.

  • Check the master device (PLC/PC) status.

  • Verify baud rate and communication settings.
—

Under-voltage (brown-out) with output shutoff
Cause: Due to low input voltage, the inverter turns its output OFF and tries to restart. If it fails to restart, the alarm trips.



Remedy:

  • Check input power stability.

  • Check for voltage sags or brownouts in the facility.