Mitsubishi Electric MELSEC-Q Series User Manual page 271

(1) Troubleshooting when the RUN LED on the master station is off
Start
A
No
RUN LED on
Is power being
Yes
supplied to the power
supply module?
No
Supply power to the
power supply module.
A
End
Yes
Yes
Is the LED
on the power supply
module on?
No
Is the CPU module
being reset?
The hardware of the power
supply module is faulty.
Replace the hardware.
The overcurrent protection
circuit has been activated. Cancel the reset operation.
Check the current
consumption of the
mounted modules.
CHAPTER 11 TROUBLESHOOTING
No
Yes
Are the modules
properly mounted?
No
Remove the modules and
mount them again.
11
Yes
Troubleshoot the problem
with reference to
"Troubleshooting common
to modules".
Page 270,
Section 11.1.1 (2)
269