5.1 Errors (Alarms)
PROTECTIVE FUNCTIONS
166
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 s, then open; or press the
STOP
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
When the protective function is activated, the inverter output is shut off and the alarm is output.
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 150% of the
rated current during acceleration, the protective circuit is activated to stop the
inverter output.
This indication also appears when the start signal is input with power supplied to
only the R1 <L
11
> and S1 <L
21
> terminals.
Check point
Check for sudden acceleration.
Check for long descending acceleration time of lift applications.
Check for output short circuit.
Check that main circuit power (R, S, T <L
1
, L
2
, L
3
>) is supplied.
Corrective action
•
Increase the acceleration time.
(Decrease descending acceleration time of lift applications.)
•
If "E.OC1" is always lit at a start, disconnect the motor once and then start the
inverter. If "E.OC1" is still lit, contact your sales representative.
•
Supply main circuit power (R, S, T <L
1
, L
2
, L
3
>).
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 150% 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.
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