Mitsubishi Electric A173UHCPU User Manual page 121

5. INSPECTION AND MAINTENANCE
(2) Flowchart when POWER indicator is not lit
Follow the flowchart below if the POWER indicator does not light when the power is
turned on or goes out during operation.
POWER indicator not lit
Is power supplied?
YES
Is
supply voltage
in range 85 to
264 VAC?
YES
Is the CPU
(power supply)
module correctly fixed?
YES
Overcurrent/
overvoltage protection
tripped?
NO
Contact your nearest
Mitsubishi representative with
details.
NO
Supply power.
NO
POWER indicator
NO
Supply voltage in the rated
range.
NO
POWER indicator
NO
Correctly fix the CPU
(power supply) module.
NO
POWER indicator
(1) Check current capacity
YES
and reduce overcurrent.
(2) Turn input power supply
off then back on.
NO
POWER indicator
5 − 10
Does
YES
light?
Does
YES
light?
Does
YES
light?
Does
YES
light?
End