Mitsubishi FR - S500 Instruction Manual page 147

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
Operation Panel Indication
Name
Description
Check point
Corrective action
OC2
Overcurrent cut-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 cut-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.
OV1
Regenerative overvoltage cut-off during acceleration
When the main circuit DC voltage in the inverter rises to or above
the specified value due to excessive regenerative energy during
acceleration, the protective circuit is activated to stop the inverter
output. The circuit may also be activated by a surge voltage
produced in the power supply system.
Check for too slow acceleration.
Decrease the acceleration time.
Install a power factor improving reactor.
OV2
Regenerative overvoltage cut-off during constant speed
When the main circuit DC voltage in the inverter rises to or above
the specified value due to excessive regenerative energy during
constant speed, the protective circuit is activated to stop the
inverter output. The circuit may also be activated by a surge
voltage produced in the power supply system.
Check for sudden load change.
Keep load stable.
Install a power factor improving reactor.
138
FR-PU04 Stedy Spd OC
FR-PU04 OC During Dec
FR-PU04 OV During Acc
FR-PU04 Stedy Spd OV
3