User`s manual

Troubleshooting Troubleshooting
MELSEC System Q, Hardware 11 – 9
(continued from the previous page)
Replace the faulty module
Completed
Reexamine the system configura-
tion not to let the total current
exceed the rated output current of
the power supply module.
Is the POWER LED on in
green?
If this problem occurs frequently,
replace the power supply module.
If the same problem still remains after
the replacement, please consult your
local Mitsubishi service center or rep-
resentative, explaining a detailed
description of the problem.
YES
NO
NO
YES
Is the POWER LED off?
NO
Check the total internal current con-
sumption (5 V DC) of the modules
that are configuring the system.
YES
NO
Power on the programmable controller again
A
YES
Is the POWER LED flicker-
ing in orange?
Replace the faulty module
NO
B
Is the total current
exceeding the rated output current
of the power supply
module?
Hardware fault
Check the operation starting from the
smallest system.
For the module that does not operate,
please consult your local Mitsubishi ser-
vice center or representative, explaining
a detailed description of the problem.