PROTECTIVE FUNCTIONS
141
5.1.2 Error (alarm) definitions
(1) Major faults
FR-PU04 Indication
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.
Check whether main circuit power (R, S, T) is supplied or not.
Corrective action
Increase the acceleration time.
Supply main circuit power (R, S, T).
FR-PU04 Indication
Stedy 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.
FR-PU04 Indication
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 motor's mechanical brake.
Corrective action
Increase the deceleration time.
Adjust brake operation.
5
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