Mitsubishi 840 Series Specifications download pdf (Page 47)

7 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 43.

If the 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 input 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 display.....................................When the protective function is activated, the operation panel display

automatically switches to the fault or alarm indication.



Resetting method ..............................When a protective function of the inverter is activated, the inverter output is kept

stopped. Unless reset, the inverter cannot restart. (Refer to page 42.)

 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 (FR-DU08) and parameter unit

(FR-PU07) 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 by making parameter setting.

 Fault

When the protective function is activated, the inverter output is shut off and a fault signal is output.

NOTES

 For the details of fault displays and other malfunctions, also refer to the Instruction Manual.

 Past eight faults can be displayed using the setting dial. (Refer to page 23.)

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Mitsubishi 840 Series Specifications Page 47