Error (Alarm) Definitions - Mitsubishi FR-S500 Instruction Manual

3.1.1

Error (alarm) definitions

(1) Major failures
When the protective function is activated, the inverter output is shut off and the alarm
is output.
Operation Panel Indication
Name
Description
Check point
Corrective action
Operation Panel Indication
Name
Description
Check point
Corrective action
Operation Panel Indication
Name
Description
Check point
Corrective action
OC1
Overcurrent shut-off during acceleration
When the inverter output current reaches or exceeds
approximately 200% of the rated inverter current during
acceleration, the protective circuit is activated to stop the inverter
output.
Check for sudden acceleration.
Check that the downward acceleration time is not long in vertical
lift application.
Check for output short-circuit/ground fault.
Increase the acceleration time.
Shorten the downward acceleration time in vertical lift application.
OC2
Overcurrent shut-off during constant speed
When the inverter output current reaches or exceeds
approximately 200% of the rated inverter current during constant-
speed operation, the protective circuit is activated to stop the
inverter output.
Check for sudden load change.
Check for output short-circuit/ground fault.
Keep load stable.
OC3
Overcurrent shut-off during deceleration
When the inverter output current reaches or exceeds
approximately 200% of the rated inverter current during
deceleration (other than acceleration or constant speed), the
protective circuit is activated to stop the inverter output.
Check for sudden speed reduction.
Check for output short-circuit/ground fault.
Check for too fast operation of motor's mechanical brake.
Increase the deceleration time.
Adjust brake operation.
157
Errors (Alarms)
FR-PU04 OC During Acc
FR-PU04 Stedy Spd OC
FR-PU04 OC During Dec
3