Troubleshooting - Mitsubishi Electric 800 Series Assembly & Installation Manuallines

6 TROUBLESHOOTING

When a fault occurs in the inverter, the protective function activates, and the PU display automatically changes to one of the fault
or alarm indications listed on page 39.
If the fault does not correspond to any of the following errors or if you have any other problem, please contact your sales repre-
sentative.
Retention of alarm output signal .............When the magnetic contactor (MC) provided on the input side of the inverter is opened
Alarm display ...................................................When the protective function is activated, the operation panel display automatically
Resetting method ..........................................When a protective function of the inverter is activated, the inverter output is kept
When the protective functions were activated, take an appropriate corrective action, then reset the inverter, and resume the
operation. Not doing so may lead to an inverter fault and damage.
Inverter fault or alarm indications are roughly divided as below:
Error message
A message regarding operational fault and setting fault by the operation panel is displayed. The inverter does not shut off
output.
Warning
The inverter does not shut off output even when a warning is displayed. However, failure to take appropriate measures will lead
to a fault.
Alarm
The inverter does not shut off output.You can also output an alarm signal (LF) by making parameter setting.
Fault
When the protective function is activated, the inverter output is shut off and a fault signal (ALM) is output.
NOTES
For the details of fault displays and other malfunctions, also refer to the FR-A870 Instruction Manual (Function).
Past eight faults can be displayed using the operation panel. (Refer to the FR-A870 Instruction Manual (Function).)
38
at the activation of the protective function, the inverter's control power will be lost and
the alarm output will not be held.
switches to the fault or alarm indication.
stopped. Unless reset, the inverter cannot restart. (Refer to page 39.)