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Errors (Alarms)
Operation Panel
Indication
0V1 FR-PU04 OV During Acc
Name Regenerative overvoltage shut-off during acceleration
Description
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 point
Check for too slow acceleration. (i.e. during descending acceleration with
lifting load)
Corrective action
• Decrease the acceleration time.
• Install a power factor improving reactor.
• Use the brake unit or power regeneration common converter (FR-CV) as
required.
Error code H20
Operation Panel
Indication
0V2 FR-PU04 Stedy Spd OV
Name Regenerative overvoltage shut-off during constant speed
Description
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 point Check for sudden load change.
Corrective action
• Keep load stable.
• Install a power factor improving reactor.
• Use the brake unit or power regeneration common converter (FR-CV) as
required.
Error code H21
Operation Panel
Indication
0V3 FR-PU04 OV During Dec
Name Regenerative overvoltage shut-off during deceleration or stop
Description
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 point Check for sudden speed reduction.
Corrective action
• Increase the deceleration time.
(Set the deceleration time that matches the moment of inertia of the load)
• Decrease the braking duty.
• Install a power factor improving reactor.
• Use the brake unit or power regeneration common converter (FR-CV) as
required.
Error code H22