Hitachi L300P Drive

Hitachi L300P Drive 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 might be wired incorrectly. Remedy: Check for short circuits at the output. Inspect the motor shaft for locking or mechanical obstruction. Reduce the load on the motor. Verify the dual-voltage motor wiring connections.
E02 Over current event during deceleration	Cause: Excessive current detected during deceleration. Similar causes to E01 (short circuit, heavy load, or locked shaft). Remedy: Check for output short circuits. Increase the deceleration time. Check if the load inertia is too high.
E03 Over current event during acceleration	Cause: Excessive current detected during acceleration. The dual-voltage motor is wired incorrectly or load is too heavy. Remedy: Check motor wiring configuration. Increase the acceleration time. Check for mechanical binding or heavy startup load.
E04 Over current event during other conditions	Cause: DC braking power (A054) is set too high, a current transformer (CT) error occurred, or a noise source induced the error. Remedy: Lower the setting for DC braking power (A054). Check for electrical noise sources near the inverter. If the error persists, the internal CT may be faulty.
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 parameters to ensure they match the motor.
E06 Braking resistor overload	Cause: When the regenerative braking resistor exceeds the usage time allowance or usage ratio. Remedy: Increase the deceleration time to reduce regenerative energy. Check if the braking resistor is sized correctly for the application. Review usage ratio settings.
E07 Over voltage protection	Cause: When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor. Remedy: Increase the deceleration time. Install an external braking resistor or braking unit. Check input voltage level.
E08 EEPROM error	Cause: When the built-in EEPROM memory has problems due to noise or excessive temperature. Remedy: Check the ambient temperature and cooling. Check for external noise sources. Verify all parameter data values are still correct (Factory Reset might be required).
E09 Under-voltage error	Cause: A decrease of internal DC bus voltage below a threshold results in a control circuit fault. Can be caused by low input voltage. Remedy: Check the input power supply voltage. Check for loose power connections. Verify the capacity of the power supply.
E10 CT (current transformer) error	Cause: If a strong source of electrical interference is close to the inverter or a fault occurs in a built-in CT. Remedy: Remove sources of electrical interference/noise. Check grounding connections. If persistent, the internal CT hardware may need repair.
E11 CPU error	Cause: A malfunction in the built-in CPU has occurred. Remedy: Cycle power (OFF/ON) to the inverter. Check for extreme electrical noise. If error recurs, replace the control unit/inverter.
E12 External trip	Cause: A signal on an intelligent input terminal configured as EXT has occurred. Remedy: Check the external device connected to the EXT input. Verify the configuration of the intelligent input terminals. Clear the external fault condition.
E13 USP (Unattended Start Protection)	Cause: Power was applied while a Run signal was present (and USP is enabled). Remedy: Turn off the Run signal (switch or command). Reset the inverter. Ensure the Run signal is OFF before powering up the inverter.
E14 Ground fault	Cause: Detection of ground faults between the inverter output and the motor during powerup tests. Remedy: Check wiring between inverter and motor for damage. Megger test the motor (disconnect inverter first). Check motor insulation.
E15 Input over-voltage	Cause: Input voltage is higher than the specified value detected 60 seconds after powerup. Remedy: Measure and lower the input AC voltage. Check the transformer tap settings supplying the inverter.
E16 Instantaneous power failure	Cause: Input power removed for more than 15ms. If duration exceeds B002 setting, it counts as a failure. Remedy: Check the stability of the incoming power supply. Check for loose connections on the input side. Adjust parameter B002 if frequent short drops occur.
E21 Inverter thermal trip	Cause: Internal temperature is above threshold. Thermal sensor detects excessive temp of power devices. Remedy: Check if the cooling fan is working and clean. Check for blocked heatsink or air vents. Reduce ambient temperature or improve cabinet ventilation.
E23 Gate array error	Cause: An internal inverter error occurred in communications between the CPU and gate array IC. Remedy: Cycle power to the inverter. If the error persists, replace the inverter unit.
E24 Phase failure detection	Cause: One of three lines of the 3-phase power is missing. Remedy: Check input fuses and circuit breakers. Check input wiring for loose connections (R, S, T). Verify 3-phase voltage balance.
E30 IGBT error	Cause: Instantaneous over-current condition on any IGBT (output transistor) device. Remedy: Check for short circuits at the motor or cable. Disconnect motor and run inverter; if E30 persists, the inverter IGBT is damaged. Check for ground faults.
E35 Thermistor error	Cause: Thermistor connected to terminals [TH] and [CM1] indicates temperature is too high. Remedy: Check motor temperature. Allow motor to cool down. Check thermistor wiring and resistance values.
—- Under-voltage (brownout)	Cause: Low input voltage caused output shutoff. The alarm trips to record the event if restart fails. Remedy: Check input power lines for voltage drops. Verify power supply capacity.
oooo Automatic restart and phase loss	Cause: The inverter is restarting due to over-current, over-voltage, under-voltage, or phase loss event (See parameter B001). Remedy: Monitor the inverter to see which specific error caused the restart. Check settings in “Automatic Restart Mode and Phase Loss” (Page 3-28).
E6X Expansion card #1 connection error	Cause: An error has occurred in expansion card #1 or at its connecting terminals. Remedy: Check the connection of the expansion card. Refer to the specific manual for the expansion card. Re-seat the card.
E7X Expansion card #2 connection error	Cause: An error has occurred in expansion card #2 or at its connecting terminals. Remedy: Check the connection of the expansion card. Refer to the specific manual for the expansion card. Re-seat the card.