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PROTECTIVE FUNCTIONS
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5.1.2 Error (alarm) definitions
(1) Major faults
When the protective function is activated, the inverter output is shut off and the alarm is
output.
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.
Corrective action
Increase the acceleration time.
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.
FR-PU04 Indication
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.
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