Mitsubishi Electric FR-S520E Series Instruction Manual page 182

Errors (Alarms)
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
OV1
Regenerative overvoltage shut-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. (e.g. during downward
acceleration in vertical lift load)
• Decrease the acceleration time.
• Install a power factor improving reactor.
OV2
Regenerative overvoltage shut-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.
OV3
Regenerative overvoltage shut-off during deceleration or stop
When the main circuit DC voltage in the inverter rises to or above
the specified value due to excessive regenerative energy during
deceleration or stop, 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 speed reduction.
• Increase the deceleration time. (Set the deceleration time which
matches the moment of inertia of the load)
• Decrease the braking duty.
• Install a power factor improving reactor.
172
FR-PU04 OV During Acc
FR-PU04 Stedy Spd OV
FR-PU04 OV During Dec