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Mitsubishi Electric FR-E520 Instruction Manual Page 197

Transistorized inverter.
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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
E. OC2
Overcurrent shut-off during constant speed
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 for sudden load change.
Check for output short-circuit/earth (ground) fault.
Keep load stable.
E. OC3
Overcurrent shut-off during deceleration
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 for sudden speed reduction.
Check for output short-circuit/earth (ground) fault.
Check for too fast operation of motor's mechanical brake.
Increase the deceleration time.
Adjust brake operation.
E. OV1
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 inverter output. It may also be activated by a
surge voltage generated in the power supply system.
Check for too slow acceleration. (e.g. during descending
acceleration with lifting load)
Decrease the acceleration time.
E. OV2
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 inverter output.
It may also be activated by a surge voltage generated in the
power supply system.
Check for sudden load change.
• Keep load stable.
• Use the brake unit, high power factor converter (FR-HC) or
power regeneration common converter (FR-CV) as required.
187
PROTECTIVE FUNCTIONS
FR-PU04 Stedy Spd OC
FR-PU04 OC During Dec
FR-PU04 OV During Acc
FR-PU04 Stedy Spd OV
5

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