E01 / OC.Drive
Overcurrent protection (During constant speed operation)
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Cause:
- The motor load has fluctuated sharply.
- Short circuit of output connections.
- Ground fault.
Remedy:
- Eliminate the load fluctuation.
- Check the output cables for short circuits.
- Check the output cables and motor for ground faults.
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E02 / OC.Decel
Overcurrent protection (During deceleration)
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Cause:
The inverter has decelerated the motor too quickly.
Remedy:
Increase the deceleration time.
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E03 / OC.Accel
Overcurrent protection (During acceleration)
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Cause:
- The inverter has accelerated the motor too quickly.
- The motor has been locked.
- The torque boost current has been set too high.
Remedy:
- Increase the acceleration time.
- Check the motor and wiring.
- Reduce the boost current.
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E04 / Over.C
Overcurrent protection (Others)
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Cause:
- The DC braking force is too high.
- Current detector (CT) failure.
Remedy:
- Reduce the braking force.
- Replace or repair the Current Detector (CT).
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E05 / Over.L
Overload protection
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Cause:
- The motor load is too high.
- The thermal level setting is inappropriate.
Remedy:
- Reduce the load factor.
- Adjust the thermal level appropriately.
- If operating at 5Hz or less, reduce torque boost current.
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E06 / OL.BRD
Braking resistor overload protection
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Cause:
- The inverter has decreased the motor speed too quickly.
- The operation cycle is too short.
- The set BRD operation rate is too low.
Remedy:
- Increase the deceleration time.
- Prolong the operation cycle.
- Adjust the setting to an appropriate level (confirm resistor capacity).
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E07 / Over.V
Overvoltage protection
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Cause:
- The inverter has decreased the motor speed too quickly (regenerative energy).
- Ground fault.
- Motor rotated by the action of the load.
Remedy:
- Increase the deceleration time.
- Check the output cables and motor for ground faults.
- Reduce the regenerative energy.
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E08 / EEPROM
EEPROM error
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Cause:
- Noise sources located near the inverter.
- Cooling efficiency has deteriorated (overheating).
Remedy:
- Remove noise sources.
- Check the heat sink for clogging and clean it.
- Replace the cooling fan.
- Initialize inverter and reset parameters.
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E09 / Under.V
Undervoltage error
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Cause:
- Power supply voltage has dropped.
- Power supply capacity is insufficient.
- Thyristor damage.
Remedy:
- Check the power supply and capacity.
- Check the thyristor (repair inverter).
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E10 / CT
CT (Current Detector) error
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Cause:
The internal Current Detector (CT) has failed.
Remedy:
Repair the inverter.
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E11 / CPU
CPU error
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Cause:
- Internal CPU malfunction.
- Noise interference.
Remedy:
- Remove noise sources located near the inverter.
- Repair the inverter if hardware failure.
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E12 / EXTERNAL
External trip
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Cause:
An error has occurred in the external equipment/device connected to the inverter.
Remedy:
Recover the external equipment from the error.
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E13 / USP
USP error (Unattended Start Protection)
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Cause:
The inverter power was turned on while an operation signal was already input/active.
Remedy:
Reset the operation command (turn switch off), and then turn on the inverter power.
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E14 / GND.Flt
Ground-fault protection
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Cause:
- Ground fault between inverter output and motor.
- Inverter hardware abnormality.
Remedy:
- Check output cables and motor.
- Remove output cables and check the inverter itself.
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E15 / OV.SRC
Input overvoltage protection
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Cause:
The input voltage is high while the inverter is stopped (kept above specification level for 100s).
Remedy:
- Lower the input voltage.
- Suppress power voltage fluctuation.
- Connect an AC reactor between power supply and inverter.
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E16 / Inst.P-F
Instantaneous power failure protection
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Cause:
- Power supply voltage dropped for 15ms or more.
- Poor contacts in MCB or magnetic contactors.
Remedy:
- Recover the power supply.
- Replace the MCB and magnetic contactor.
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E20 / OH.stFAN
Temperature error (Low cooling-fan speed)
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Cause:
- Cooling efficiency lowered (fan failure).
- Heat sink clogged.
Remedy:
- Replace the cooling fan.
- Clean the heat sink.
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E21 / OH.fin
Temperature error (Main circuit high temp)
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Cause:
- Improper installation (not vertical).
- High ambient temperature.
Remedy:
- Check the installation (ensure vertical mounting).
- Lower the ambient temperature.
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E23 / GA.COM
Gate array communication error
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Cause:
- Noise interference.
- Internal communication cable disconnected.
Remedy:
- Remove noise sources.
- Check the internal connectors.
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E24 / PH.fail
Phase loss input protection
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Cause:
- Phase loss in power input.
- Poor contacts in MCB/Magnetic contactor.
Remedy:
- Check power supply input wiring.
- Replace MCB or magnetic contactor.
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E25 / Main.Cir
Main circuit error
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Cause:
- Malfunction due to noise.
- Main circuit element (IGBT) damage.
Remedy:
- Remove noise sources.
- Check the IGBT and output circuit.
- Repair the inverter.
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E30 / IGBT
IGBT error (Instantaneous overcurrent)
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Cause:
- Short circuit in output.
- Ground fault.
- Main circuit element (IGBT) damage.
Remedy:
- Check output cables and motor for shorts/ground faults.
- Check the IGBT.
- Clean heat sink (if clogging caused overheat).
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E35 / TH
Thermistor error
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Cause:
- Motor temperature is high.
- Internal thermistor of motor damaged.
- Noise in thermistor signal.
Remedy:
- Check motor temperature.
- Check the thermistor.
- Separate thermistor wiring from other wiring (noise).
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E36 / BRAKE
Braking error
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Cause:
- Brake has not turned on/off correctly.
- Wait time (b124) is too short.
- Braking confirmation signal wiring issue.
Remedy:
- Check the brake.
- Increase the wait time setting [b124].
- Check the wiring.
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E37 / EMR
Emergency stop
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Cause:
- Error in external equipment (emergency stop function enabled).
- Noise sources.
Remedy:
- Recover external equipment from error.
- Remove noise sources.
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E38 / OL-LowSP
Low-speed overload protection
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Cause:
Overload occurred during motor operation at very low speed (0.2Hz or less).
Remedy:
Reduce the load factor.
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E41 / NET.ERR
Modbus communication error
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Cause:
Timeout due to line disconnection or setup issue.
Remedy:
- Check communication speed setting.
- Check wiring distance.
- Check connections.
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E60 to E69
(Remote: OP1-0 to OP1-9)
Option 1 Board Errors (Slot 1)
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Cause:
- E60: Encoder disconnection.
- E61: Excessive speed.
- E62: Positioning error.
- E63: Position control range trip.
- E69: Connection/Mounting error.
Remedy:
- Check if option board is mounted correctly.
- Check encoder wiring and settings.
- Refer to the instruction manual for the specific Option Board (SJ-FB, SJ-DG, or SJ-DN).
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E70 to E79
(Remote: OP2-0 to OP2-9)
Option 2 Board Errors (Slot 2)
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Cause:
Similar causes to Option 1 errors but for the board in Slot 2.
Remedy:
- Check board mounting.
- Refer to the specific option board manual.
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E43 / PRG.CMD
Invalid instruction (Easy Sequence)
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Cause:
Invalid instruction found in downloaded program or PRG terminal active with no program.
Remedy:
Check the program code.
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E44 / PRG.NST
Nesting count error
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Cause:
Subroutines or loops nested more than 8 levels deep.
Remedy:
Correct the program nesting structure.
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E45 / PRG.ERR1
Execution error 1
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Cause:
- Jump destination not found.
- Arithmetic overflow/underflow or division by zero.
- Undefined parameter or out of range setting.
Remedy:
Debug the Easy Sequence program.
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E50 to E59
(PRG-0 to PRG-9)
User trips 0 to 9
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Cause:
The inverter executed a “trip” instruction defined in the user program.
Remedy:
Check the condition in the program that triggers this trip.
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