Hitachi SJ300 Drive

Hitachi SJ300 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.

Note: The SJ300 will over current trip at nominally 200% of rated current for models up to –550xxx; nominally 180% of rated current for models –750xxx to –1500xxx.



Remedy:


  • Check for short circuits at the output.

  • Check if motor shaft is locked or load is too heavy.

  • Verify motor wiring.
E02

Over current event during deceleration
Cause:

Excessive current detected during deceleration. Similar causes to E01 (short circuit, locked shaft, heavy load).



Remedy:


  • Check deceleration time parameters.

  • Check for load issues.
E03

Over current event during acceleration
Cause:

Excessive current detected during acceleration. Similar causes to E01.



Remedy:


  • Check acceleration time parameters.

  • Check for motor wiring or mechanical constraints.
E04

Over current event during other conditions
Cause:

DC braking power (A054) is set too high, or a current transformer error occurred, or a noise source induced the error.



Remedy:


  • Check setting A054 (DC braking power).

  • Check for electrical noise sources near the inverter.
E05

Overload protection
Cause:

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



Remedy:


  • Check motor load and rating.

  • Verify electronic thermal protection parameters.
E06

Braking resistor overload
Cause:

When the regenerative braking resistor exceeds the usage time allowance or usage ratio, the inverter trips and turns OFF its output to the motor.



Remedy:


  • Check braking resistor sizing and usage ratio.

  • Verify deceleration requirements.
E07

Over voltage protection
Cause:

When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor.



Remedy:


  • Check input voltage.

  • Check if deceleration time is too short.

  • Consider using a braking resistor if not present.
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 noise sources.

  • Check ambient temperature/cooling.

  • Confirm parameter data values are still correct (as per Note on page 6-7).
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. The inverter trips and turns OFF its output.



Remedy:


  • Check input power supply voltage.

  • Check power lines for loose connections.
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 (current transformer), the inverter trips and turns its output OFF.



Remedy:


  • Remove sources of electrical interference (noise).

  • Inspect inverter hardware.
E11

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:


  • Reset the inverter.

  • 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:


  • Check the external device connected to the EXT input.

  • Clear the external fault condition.
E13

USP (Unattended Start Protection)
Cause:

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.



Remedy:


  • Remove the Run signal before applying power.

  • Reset the fault.
E14

Ground fault
Cause:

The inverter is protected by the detection of ground faults between the inverter output and the motor during powerup tests. This feature protects the inverter, and does not protect humans.



Remedy:


  • Check motor and cabling for ground faults (shorts to earth).
E15

Input over-voltage
Cause:

When the input voltage is higher than the specified value, it is detected 60 seconds after powerup and the inverter trips and turns OFF its output.



Remedy:


  • Measure and verify input voltage matches inverter specifications.
E16

Instantaneous power failure
Cause:

When the input power is removed for more than 15ms, the inverter trips and the output to the motor turns OFF. If the power failure duration exceeds the duration set in parameter B002, it is considered a power failure.



Remedy:


  • Check power supply stability.

  • Review parameter B002 settings.
E21

Inverter thermal trip
Cause:

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.



Remedy:


  • Check cooling fan operation.

  • Check for blocked air vents or high ambient temperature.

  • Clean heat sink.
E23

Gate array error
Cause:

An internal inverter error has occurred in communications between the CPU and gate array IC.



Remedy:


  • Reset the inverter.

  • If persistent, replace control board/inverter.
E24

Phase failure detection
Cause:

One of three lines of the 3-phase power is missing.



Remedy:


  • Check input power wiring (R, S, T) for open phases.

  • Check fuses or circuit breakers.
E30

IGBT error
Cause:

When an instantaneous over-current condition occurs on any IGBT (output transistor) device, the inverter alarm trips, then it turns the outputs OFF in order to protect the circuitry.



Remedy:


  • Check for output short circuits.

  • Check for instantaneous load spikes.
E35

Thermistor
Cause:

When a thermistor is connected to terminals [TH] and [CM1] and the inverter has sensed the temperature is too high, the inverter trips and turns OFF the output.



Remedy:


  • Check motor temperature.

  • Check thermistor wiring and operation.
E36

Brake error
Cause:

When the inverter releases the brake and cannot detect whether the external brake is ON or OFF within the waiting time (set by parameter B024), the inverter trips and turns OFF the output to the motor.



Remedy:


  • Check external brake operation.

  • Adjust parameter B024 (waiting time).
—-

Under-voltage (brownout) with output shutoff
Cause:

Due to low input voltage, the inverter turns its output OFF and tries to restart. If it fails to restart, then the alarm trips to record the under-voltage error event.



Remedy:


  • Correct the input voltage level.
Loop Symbol

Automatic restart and phase loss
Cause:

The inverter is restarting, due to an over-current, over-voltage, under-voltage, or a phase loss event.



Remedy:


  • See parameter B001 setting in “Automatic Restart Mode and Phase Loss” (page 3–29 of manual).
E6X

Expansion card #1 connection error
Cause:

An error has occurred in an expansion card or at its connecting terminals.



Remedy:


  • Check expansion card #1 connection.

  • Refer to the manual for the expansion card for additional details.
E7X

Expansion card #2 connection error
Cause:

An error has occurred in expansion card #2.



Remedy:


  • Check expansion card #2 connection.

  • Refer to the manual for the expansion card for additional details.