PROTECTIVE FUNCTIONS

 Errors (Alarms)

If any fault occurs in the inverter, the corresponding protective function is activated to bring the inverter to an alarm stop and automatically display the corresponding error (alarm) indication on the optional control panel or the parameter unit display.

If your fault does not correspond to any of the following errors or if you have any other problem, please contact your sales representative.

    Retention of Alarm Output Signal: When the magnetic contactor (MC) provided on the power supply side of the inverter is opened at the activation of the protective function, the inverter's control power will be lost, and the alarm output will not be held.

    Alarm Indication: When the protective function is activated, the operation panel display automatically switches to the above indication.

    Resetting Method: When the protective function is activated, the inverter output is kept stopped. Unless reset, therefore, the inverter cannot restart. Switch power off once, then on again; or apply the RES signal for more than 0.1 seconds. When kept on, "Err." appears (flickers) to indicate that the inverter is being reset.

    Corrective Action: When the protective function is activated, take the corresponding corrective action, then reset the inverter, and resume operation.

Major Faults

When the protective function is activated, the inverter output is shut off and the alarm is output.

    Operation Panel Indication: E. OC1 FR-PU04 OC During Acc

    Name: Overcurrent shut-off during acceleration

    Description: When the inverter output current reaches or exceeds approximately 200% of the rated current during acceleration, the protective circuit is activated to stop the inverter output.

    Check Point: Check for sudden acceleration. Check for output short-circuit/ground fault.

    Corrective Action: Increase the acceleration time.

    Operation Panel Indication: E. OC2 FR-PU04 Steady Spd OC

    Name: Overcurrent shut-off during constant speed

    Description: When the inverter output current reaches or exceeds approximately 200% of the rated current during constant speed, the protective circuit is activated to stop the inverter output.

    Check Point: Check for sudden load change. Check for output short-circuit/ground fault.

    Corrective Action: Keep load stable.



    Operation Panel Indication: E. OC3 FR-PU04 OC During Dec

    Name: Overcurrent shut-off during deceleration

    Description: When the inverter output current reaches or exceeds approximately 200% of the rated current during deceleration (other than acceleration or constant speed), the protective circuit is activated to stop the inverter output.

    Check Point: Check for sudden speed reduction. Check for output short-circuit/ground fault. Check for too fast operation of the motor's mechanical brake.

    Corrective Action: Increase the deceleration time. Adjust brake operation.

    Operation Panel Indication: E. OV1 FR-PU04 OV During Acc

    Name: Regenerative overvoltage shut-off during acceleration

    Description: If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the specified value, the protective circuit is activated to stop the inverter output. It may also be activated by a surge voltage generated in the power supply system.

    Check Point: Check for too slow acceleration.

    Corrective Action: Decrease the acceleration time.

    Operation Panel Indication: E. OV2 FR-PU04 Steady Spd OV

    Name: Regenerative overvoltage shut-off during constant speed

    Description: If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the specified value, the protective circuit is activated to stop the inverter output. It may also be activated by a surge voltage generated in the power supply system.

    Check Point: Check for sudden load change.

    Corrective Action: Keep load stable. Use the brake unit or high power factor converter (FR-HC) as required.

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