Instruction manual

164
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 optional operation panel or the parameter unit 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; or apply RES signal for
more than 0.1s. Kept on, "Err." appears (flickers) to
indicate that the inverter is being reset.
• When the protective function is activated, take the appropriate corrective action, then
reset the inverter, and resume operation.
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-MGI 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 that the downward acceleration time is not long in
vertical lift application.
Check for output short-circuit/ground fault.
Corrective action
Increase the acceleration time. (Shorten the downward
acceleration time in vertical lift application.)
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