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12
TROUBLESHOOTING
12.2 Troubleshooting Flowchart
12.2.2 Flowchart for when the ERR terminal (negative logic) is off (opened)
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 AND 
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NDICES
 INDEX
 
 
Errors that can be detected by the ERR. terminal
The following shows the errors that can be detected by the ERR. terminal of the 
power supply module.
Figure 12.2 Flowchart for when the ERR terminal turns off
Table12.1 Errors that can be detected by the ERR terminal of a power supply module
Base unit
CPU module
QS001CPU
Main base unit (QS034B)
AC power not input, power supply module fuse blown and CPU module stop error 
(including reset) can be detected.
Check the sum of internal current 
consumptions of the modules that 
comprise the system.
Hardware error of a module other than 
the power supply module and base unit
Install modules to the base unit one by 
one and execute operation checks in 
due order.
For the module that does not operate, 
please consult your local Mitsubishi 
representative, explaining a detailed 
description of the problem.
Off
Reexamine the system configuration to make the 
total current less than the rated current consumption 
of one  power supply module.
On
The base unit that includes the corresponding 
power supply module is faulty.
(Change it for a normal base unit.)        
Yes
No
Does the total 
current exceed the rated 
current consumption of one power 
supply module?
How is the "POWER" 
LED of the power supply 
module?
(From previous page)