Mitsubishi Electric FR-F500 Series Instruction Manual page 181

Operation Panel
E.OC3
Indication
Name Overcurrent shut-off during deceleration
When the inverter output current reaches or exceeds approximately 150% of the
Description rated 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 point Check for output short circuit.
Check for too fast operation of motor's mechanical brake.
Increase the deceleration time.
Corrective action
Check mechanical brake operation.
Operation Panel
E.OV1
Indication
Name Regenerative overvoltage shut-off during acceleration
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
Description
inverter output. It may also be activated by a surge voltage generated in the
power supply system.
Check point Check for too slow acceleration. (i.e. during descending acceleration with lifting load)
Corrective action Decrease the acceleration time.
Operation Panel
E.OV2
Indication
Name
Regenerative overvoltage shut-off during constant speed
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
Description
inverter output. It may also be activated by a surge voltage generated in the
power supply system.
Check point Check for sudden load change.
• Keep load stable.
• Use the brake unit or power regeneration common converter (FR-CV) as
Corrective action
Operation Panel
E.OV3
Indication
Name Regenerative overvoltage shut-off during deceleration or stop
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
Description
inverter output. It may also be activated by a surge voltage generated in the
power supply system.
Check point Check for sudden speed reduction.
• Increase the deceleration time. (Set the deceleration time which matches the
• Decrease the braking duty.
Corrective action
• Use the brake unit or power regeneration common converter (FR-CV) as
required.
inertia moment of the load.)
required.
167
PROTECTIVE FUNCTIONS
FR-PU04 OC During Dec
FR-PU04 OV During Acc
FR-PU04
FR-PU04 OV During Dec
Stedy Spd OV
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