Mitsubishi Q170MCPU User Manual page 152

6 INSPECTION AND MAINTENANCE
1)
Remove all modules from the
extension base unit.
Does "POWER"
LED turn on?
YES
Install all modules that removed from
the extension base unit to the
extension base unit.
Check the sum of internal current
consumption of the modules that
comprise the system.
Does the total
current exceed the rated
output current?
NO
A hardware fault
Check operation in the order starting
with the minimum system.
If the module will not work, explain
the error symptom and get advice
from our sales representative for the
modules with failure.
The extension base unit or extension
NO
cable is faulty.
(Replace it with a normal extension
base unit or extension cable.)
Does "POWER"
LED turn on?
A hardware fault
Explain the error symptom and get
advice from our sales representative.
Reexamine the system configuration
YES
to make the total current less than the
rated output current.
NO
Does "POWER"
LED turn on?
6 - 17
YES
NO
YES
END