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9 Power Backup System
MITSUBISHI CNC
9.4 Troubleshooting for Power Backup System
9.4.1 LED Display When Alarm or Warning Occurs
An alarm/warning No. of the power backup unit is displayed with the LED of the unit. The 2nd digit number and the 1st
digit number are displayed one by one.
When an alarm occurs, the LED flickers, and when a warning occurs, the LED stays lit.
< Display example of Alarm 1C >
< Display example of Warning D0 >
CAUTION
An alarm/warning No. of the power backup system is not displayed on the NC screen. When an alarm/warning of the power
backup system occurs, the following power supply alarm/warning is displayed on the NC screen
Check the details of the alarm/warning according to the LED display of the power backup unit.
“Power supply option unit error: Alarm 74”
“Power supply option unit error: Warning EF”
2nd digit of
alarm No.
1st digit of
alarm No.
Not lit
LED display during power backup unit alarm
2nd digit of
warning No.
1st digit of
warning No.
Not lit
LED display during power backup unit warning