Hitachi L200 Fault Codes List

Troubleshoot your Hitachi L200 inverter with our updated guide. Learn to interpret E01-E60 trips, access the trip history via the d081 parameter, and reset faults to minimize downtime.

Hitachi L200 Fault Codes Reference Table

Below is the complete list of protective functions and trip codes. Please refer to this table to match the alphanumeric code on your inverter with the specific hardware or load issue.

L200 Inverter Fault Codes

Fault Code and Meaning	Cause 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.

 

How to Read L200 Faults via the Digital Operator

The Hitachi L200 stores detailed information about the last three trip events. In 2026, using the Monitor (d) parameters is the fastest way to troubleshoot without proprietary software.

• Trip History (d081 to d083): Parameter d081 shows the most recent fault. Parameters d082 and d083 store the two previous failures.
• Status Snapshot: When viewing a trip in d081, the display alternates between the error code and the inverter status (Output Frequency, Current, and DC Bus Voltage) at the time of the trip.
• Monitor Mode: Use the FUNC key to navigate to the “d” group to view real-time data such as d001 (Output frequency) or d002 (Output current) to identify spikes before a trip happens.

General Troubleshooting Steps

Before performing a manual reset on your Hitachi L200, perform these essential hardware checks:

1. Overcurrent (E01 – E04): Check for short circuits in the motor wiring. If the trip happens only during acceleration, increase the Acceleration Time in parameter F002.
2. Overvoltage (E07): Typically caused by a high-inertia load decelerating too quickly. Increase the Deceleration Time in parameter F003 or check for a spike in the input line voltage.
3. Thermal Trip (E05): The inverter has detected a motor overload. Verify the motor’s rated current setting in parameter b012 (Electronic Thermal Level).

Frequently Asked Questions (FAQ)

Q: What is the difference between a Trip and a Warning?

A: A Trip (codes starting with ‘E’) immediately stops the inverter output to protect the motor and drive. A Warning (indicated by status LEDs or codes like ‘USP’) indicates an abnormal condition that may allow the drive to continue running or prevent it from starting.

Q: How do I reset a Hitachi L200 fault?

A: Once the cause is cleared, you can reset the drive by:

• Pressing the Stop/Reset key on the keypad.
• Closing the digital input terminal assigned as RS (Reset) (Terminal 5 is the default reset input).
• Performing a power cycle (Wait for the display to go completely dark before turning it back on).

Q: Why does my drive show “USP” on the display?

A: USP (Unattended Start Protection) is a safety error. It occurs if the Run command is active when the power is turned on. Turn off the Run command to clear the “USP” message.

Q: Where is the fault history stored?

A: The history of the last 3 faults is stored in Monitor Mode under parameters d081, d082, and d083. Each entry provides the fault code and the electrical conditions at the time of the event.