Mitsubishi MELESEC-ST User Manual page 132

12 TROUBLESHOOTING
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(2) When ERR. LED is flickering
When the ERR. LED of the power distribution module is flickering, check the
following LEDs and take corrective action.
(a) When SYS. LED is off (only the bus refreshing module)
Check item
Is 24VDC of SYS. input supplied?
(b) When AUX. LED is off
Check item
Is 24VDC of AUX. input supplied?
Corrective action
Check whether the input voltage to the bus
refreshing module is within the rated range.
Corrective action
Check whether the input voltage to the power
distribution module is within the rated range.
MELSEC-ST
12 - 7