MITSUBISHI ELECTRIC FR-S520 - Manual (Page 146)

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3
.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.
Retention of alarm output signal......When the magnetic contactor (MC) provided on
the power supply side of the inverter is opened
at the activation of the protective function, the
inverter's control power will be lost and the
alarm output will not be held.
Alarm indication...............................When the protective function is activated, the
operation panel display automatically switches
to the above indication.
Resetting method ............................When the protective function is activated, the
inverter output is kept stopped. Unless reset,
therefore, the inverter cannot restart. Switch
power off once, then on again; power off once,
then on again; or apply RES signal for more
than 0.1 second. Kept on, "Err." appears
(flickers) to indicate that the inverter is being
reset.
When the protective function is activated, take the corresponding corrective action,
then reset the inverter, and resume operation.
3
.1.1 Error (alarm) definitions
(1) Major failures
When the protective function is activated, the inverter output is shut off and the alarm
is output.
Operation Panel Indication OC1 FR-PU04 OC During Acc
Name Overcurrent cut-off during acceleration
Description
When the inverter output current reaches or exceeds
approximately 200% of the rated inverter current during
acceleration, the protective circuit is activated to stop the inverter
output.
Check point
Check for sudden acceleration.
Check for output short-circuit/ground fault.
Corrective action Increase the acceleration time.