Hitachi SJ700D Drive

Hitachi SJ700D Drive Fault Codes:

Fault Code and MeaningCause and Remedy
E01 / E02 / E03 / E04

Overcurrent protection
Cause:
The motor was constrained or suddenly accelerated/decelerated, causing high current to flow. The inverter detected current higher than the specified level.

  • E01: During constant speed operation.

  • E02: During deceleration.

  • E03: During acceleration.

  • E04: Others.




Remedy:

  • Check for short circuits or ground faults.

  • Check if the motor load is too heavy or constrained.

  • Adjust acceleration/deceleration times.
E05

Overload protection
Cause:
The internal electronic thermal protection circuit has detected a motor overload based on the output current.



Remedy:

  • Check the motor load magnitude.

  • Check the electronic thermal protection settings.
E06

Braking resistor overload protection
Cause:
The BRD (Braking Resistor) operation rate exceeded the setting of “b090”.



Remedy:

  • Check the braking usage ratio.

  • Increase deceleration time or check the “b090” setting.
E07

Overvoltage protection
Cause:
DC voltage across P and N terminals is too high. This can happen due to regenerative energy from the motor or high input voltage.

Trip levels: >400 VDC (200V class) or >800 VDC (400V class).



Remedy:

  • Check if input voltage is within specifications.

  • Check if deceleration is too fast (regenerative energy).
E08

EEPROM error
Cause:
Internal EEPROM error caused by external noise, abnormal temperature rise, or CPU error.



Remedy:

  • Turn off the inverter power and turn it back on.

  • If E08 persists, initialize the inverter and re-set parameters.

  • Check for external noise sources.
E09

Under voltage
Cause:
Input voltage dropped, causing the DC voltage across P and N terminals to fall below the specified level.

Trip levels: <175 VDC (200V class) or <345 VDC (400V class).



Remedy:

  • Check the input power supply voltage.

  • Check for power failures or loose connections.
E10

CT error
Cause:
Error in the internal current detector (CT). The CT outputs about 0.6 V or more at power-on.



Remedy:

  • Hardware failure likely; contact service/repair.
E11

CPU error
Cause:
Internal CPU malfunction or error. Can also be caused by reading abnormal data from EEPROM.



Remedy:

  • Turn power off and on again.

  • Check grounding and noise interference.
E12

External trip
Cause:
An error occurred in external equipment connected to the inverter, triggering the external trip signal.



Remedy:

  • Check the external device connected to the trip terminal.

  • Resolve the fault in the external system.
E13

USP error
Cause:
Power was turned on while an input operation signal was already active (remaining in the inverter).



Remedy:

  • Turn off the run command before powering on the inverter.

  • Check the USP function settings.
E14

Ground-fault protection
Cause:
A ground fault was detected between the inverter output circuit and the motor upon power-on.



Remedy:

  • Check motor and cables for insulation failure or ground faults.
E15

Input overvoltage protection
Cause:
Input voltage kept above specification level for 100 seconds while stopped.



Remedy:

  • Check the power source voltage.
E16

Instantaneous power failure protection
Cause:
Instantaneous power failure lasted 15 ms or more.



Remedy:

  • Check power supply stability.
E20

Temperature error (Fan)
Cause:
Cooling-fan speed lowering detected.



Remedy:

  • Check cooling fan for obstruction or failure.

  • Clean air vents.
E21

Temperature error (Main)
Cause:
Main circuit temperature rose due to high ambient temperature or other reasons.



Remedy:

  • Check ambient temperature.

  • Ensure proper ventilation around the inverter.
E23

Gate array communication error
Cause:
Communication error between the internal CPU and gate array.



Remedy:

  • Internal hardware issue. Turn power off/on.
E24

Phase loss input protection
Cause:
Input phase loss detected (when enabled via b006=01). Phase loss continued for about 1 second or more.



Remedy:

  • Check input power wiring (R, S, T) for loose connections or open phases.
E25

Main circuit error
Cause:
Gate array cannot confirm the on/off state of IGBT due to noise, short, or damage.



Remedy:

  • Check for excessive noise.

  • Inverter hardware may be damaged.
E30

IGBT error
Cause:
Instantaneous overcurrent, abnormal main circuit element temperature, or drive power drop. The inverter shuts off to protect the element.



Remedy:

  • Cannot retry operation immediately. Turn off power and check motor/output for shorts.
E34

Phase loss output protection
Cause:
Output phase loss detected (when enabled via b141=01) while output frequency is 5 Hz to 100 Hz.



Remedy:

  • Check output wiring (U, V, W) to the motor.
E35

Thermistor error
Cause:
The resistance of the thermistor connected to the TH terminal indicates the motor temperature has risen.



Remedy:

  • Check motor temperature.

  • Allow motor to cool down.
E37

Emergency stop
Cause:
EMR signal (on three terminals) turned on, or slide switch (SW1) set to ON. Malfunction due to noise if EMR not ON.



Remedy:

  • Check EMR terminal status.

  • Reset the inverter by turning on the RS terminal (Digital operator reset not accepted).
E38

Low-speed overload protection
Cause:
Overload occurred during motor operation at very low speed (0.2 Hz or less).



Remedy:

  • Check load at low speeds.
E41

Modbus communication error
Cause:
Timeout occurred due to line disconnection during Modbus-RTU communication.



Remedy:

  • Check communication cables and settings (C076).
E43

Invalid instruction
Cause:
Inverter detected error in “Easy Sequence”.



Remedy:

  • Refer to SJ700D-3 instruction manual regarding Easy Sequence programming.
E44

Nesting count error
Cause:
Inverter detected error in “Easy Sequence”.



Remedy:

  • Refer to SJ700D-3 instruction manual regarding Easy Sequence programming.
E45

Execution error
Cause:
Inverter detected error in “Easy Sequence”.



Remedy:

  • Refer to SJ700D-3 instruction manual regarding Easy Sequence programming.
E50 to E59

User Trip
Cause:
The inverter detects errors in the easy sequence.



Remedy:

  • Refer to SJ700D-3 instruction manual.
E60 to E69

Option 1 error
Cause:
Error in the option board mounted in optional slot 1.



Remedy:

  • Refer to the instruction manual for the mounted option board.
E70 to E79

Option 2 error
Cause:
Error in the option board mounted in optional slot 2.



Remedy:

  • Refer to the instruction manual for the mounted option board.