Instruction manual

5.1 Errors (Alarms)
PROTECTIVE FUNCTIONS
172
5 PROTECTIVE FUNCTIONS
5.1 Errors (Alarms)
If any fault has occurred in the inverter, the corresponding protective function is activated to bring the inverter
to an alarm stop and automatically give the corresponding error (alarm) indication on the PU display.
If your fault does not correspond to any of the following errors or if you have any other problem, please
contact your sales representative.
• When the protective function is activated, take the corresponding corrective action, then reset the inverter,
and resume operation.
• Resetting method
When the protective function is activated and the inverter has stopped its output, the inverter output is kept
stopped (and the motor is coasted to a stop). Unless reset, therefore, the inverter cannot restart. To reset,
use any of the following methods: switch power off once, then on again; short reset terminal RES-SD for
more than 0.1 seconds, then open; or press the [RESET] key of the operation panel or parameter unit (use
the help function of the parameter unit). If RES-SD are kept shorted, the operation panel shows "Err." and
the parameter unit indicates that the inverter is being reset.
5.1.1 Error (alarm) definitions
(
1
)
Major faults
Operation Panel
Indication
E.OC1
FR-PU04 OC During Acc
Name Overcurrent shut-off during acceleration
Description
When the inverter output current reaches or exceeds approximately 200% of the
rated current during acceleration, the protective circuit is activated to stop the
inverter output.
Check point
Check for sudden acceleration.
Check for output short circuit.
Corrective action Increase the acceleration time.
Operation Panel
Indication
E.OC2
FR-PU04 Stedy Spd OC
Name
Overcurrent shut-off during constant speed
Description
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 point
Check for sudden load change.
Check for output short circuit.
Corrective action Keep load stable.
Operation Panel
Indication
E.OC3
FR-PU04 OC During Dec
Name Overcurrent shut-off during deceleration
Description
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 point
Check for sudden speed reduction.
Check for output short circuit.
Check for too fast operation of motor's mechanical brake.
Corrective action
Increase the deceleration time.
Check mechanical brake operation.