When The Life Led Does Not Turn On In Green Or Orange - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.1.3

When the LIFE LED does not turn on in green or orange

Check the following items according to the LIFE LED status.
(1) When the LIFE LED is off
Resupply power to the system. If the LIFE LED turns on in red for one second, replace the power supply module
as the power supply module has reached its end of life.
If the LIFE LED does not turn on or flicker after resupplying power, the power supply module should be replaced
as the life diagnosis is impossible.
(2) When the LIFE LED turns on in red
The operating ambient temperature is out of the range of 0 to
55°C.
The LIFE LED turns on in red after power is resupplied.
(3) When the LIFE LED flickers in red
Supply power to the system again. If the LIFE LED does not turn on in green or orange even after the power is
supplied, check the wiring between LG and FG by referring to the following.
• Grounding a programmable controller (
• Wiring a power cable and a ground wire (
• Grounding a power supply part (
If the symptom still remains after the check, replace the power supply module.
Check item
Page 116, Section 4.8.4)
Page 662, Appendix 8.1.5)
CHAPTER 15 TROUBLESHOOTING
Corrective action
Keep the operating ambient temperature within the range of
0 to 55°C.
Stop the operation of the power supply module for a while,
and resupply power to the system after the internal
temperature of the module is lowered.
If the LIFE LED does not turn on in green or orange after
resupplying power, replace the power supply module.
Page 654, Appendix 8.1.2 (2))
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