User`s manual

Troubleshooting Troubleshooting
11 – 4
11.2.1 ERR. terminal (negative logic) has turned off (opened)
The ERR. contact (error output) of the power supplies is closed in normal operation (refer to sec-
tions 7.3 and 7.4).
● If the ERR.
terminal has turned off (opened), check first: How is the ERR. LED of the CPU
module? If the ERR. LED is flickering (CPU module is in stop error), check error details and
take action according to the details (refer to section 11.2.10).
● If the ERR. LED of the CPU is not flickering, check the following:
Is power supplied? Is the power supply voltage proper?
If not, supply power of proper voltage.
● If the power supply voltage is proper, check the MODE LED of the CPU*. If it‘s on (green),
the corresponding power supply module is faulty (replace it with a normal power supply
module).
* Q00J-, Q00- or Q01CPU do not have a MODE LED. In this case continue troubleshooting with the next point.
● If the MODE LED is off, remove the corresponding power supply module, and mount it to
the normal base unit. (Do not mount any modules other than the power supply module.)
If the POWER LED of the power supply module is on (red), the corresponding power supply
module is faulty (replace it with a normal power supply module).
● If the POWER LED of the power supply module turned on (green), mount the corresponding
power supply module to the original system again, and remove all modules other than the
power supply module from the base unit.
If the POWER LED of the power supply module is off, the base unit that includes the
corresponding power supply module is faulty and must be replaced.
● If the POWER LED of the power supply module is on (green), (when mounted to the original
system again), check the sum of internal current consumptions of the modules that comprise
the system.
– If the total current exceeds the rated current consumption of one power supply module,
Reexamine the system configuration to make the total current less than the rated current
consumption of one power supply module.
– If the total current does not exceed the rated current consumption of one power supply
module, a hardware fault may have occurred in one of the modules. Execute operation
checks in due order, starting with the minimum system. For the module that does not
operate, please contact your local Mitsubishi service center or representative, explaining
a detailed description of the problem.
NOTE If a CPU module stop error occurs during use of two redundant power supply modules, the
error is output from the ERR.
terminals of the two redundant power supply modules. (Both
ERR.
terminals are opened.)