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2.4.2 Troubleshooting
When a fault occurs in the inverter, the inverter trips and the PU display automatically changes to one of the fol-
lowing fault or alarm indications.
◎ Retention of fault output signal
When the magnetic contactor (MC) provided on the input side of the inverter is opened when a fault occurs,
the inverter's control power will be lost and the fault output will not be held.
◎ Fault or alarm indication
When a fault or alarm occurs, the operation panel display automatically switches to the fault or alarm indication.
◎ Resetting method
When a fault occurs, the inverter output is kept stopped. Unless reset, therefore, the inverter cannot restart.
When any fault occurs, take the appropriate corrective action, then reset the inverter, and resume operation.
Not doing so may lead to the inverter fault and damage.
Inverter fault or alarm indications are roughly categorized as below.
1
Error message
A message regarding operational fault and setting fault by the operation panel and parameter unit
(FR-PU04 /FR-PU07) is displayed. The inverter does not trip.
2
Warning
The inverter does not trip even when a warning is displayed. However, failure to take appropriate
measures will lead to a major fault.
3
Minor failure
The inverter does not trip. You can also output a minor failure signal by making parameter setting.
4
Major fault
When a fault occurs, the inverter trips and a fault signal is output.
<Reference>
Refer to Appendix 2 as it contains a list of fault displays and the appropriate troubleshooting steps to resolve the issue.
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