Mitsubishi Electric FR-V500 Series Instruction Manual page 78

Control Panel
Indication
Name
Overcurrent shut-off during deceleration
When the inverter output current reaches or exceeds approximately 200% of the rated inverter
Description
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 the motor's mechanical brake.
• Increase the deceleration time.
Corrective action
• Check the mechanical brake operation.
Control Panel
Indication
Name
Regenerative overvoltage shut-off during acceleration (*2)
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description
specified value, 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 point
Check for too slow acceleration.(i.e. during descending acceleration with lifting load)
• Decrease the acceleration time.
Corrective action
• Use the brake unit or power regeneration common converter (FR-CV) as required.
Control Panel
Indication
Name Regenerative overvoltage shut-off during constant speed (*2)
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description
specified value, 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 point Check for sudden load change.
• Keep load stable.
Corrective action
• Use the brake unit or power regeneration common converter (FR-CV) as required.
2: E. OV3 appears if the over voltage shutoff occurs during positioning.
*
Control Panel
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
Description
specified value, 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 point Check for sudden speed reduction.
• Increase the deceleration time.
Corrective action
• Decrease the braking duty.
• Use the brake unit or power regeneration common converter (FR-CV) as required.
Control Panel
Indication
Name Motor overload shut-off (electronic overcurrent protection (electronic thermal relay function)) (*3)
The electronic thermal relay function built in the inverter detects motor overheat due to overload or
reduced cooling capability during low-speed operation to stop the inverter output. When running a
Description
multi-pole motor or two or more motors during V/F control, provide a thermal relay in the inverter
output side since such motor(s) cannot be protected.
Protection against burnout due to motor temperature rise
Check point
Check the motor for use under overload.
• Reduce the load weight.
Corrective action
• For a constant-torque motor, set the constant-torque motor in Pr. 71 "applied motor".
E.OC3
E.OV1
E.OV2
E.OV3
(Set the deceleration time that meets the moment of inertia of the load)
E.THM
FR-PU04V OC During Dec
FR-PU04V OV During Acc
FR-PU04V Stedy Spd OV
FR-PU04V OV During Dec
FR-PU04V Motor Overload
75
Errors (Alarms)
6