Handling Errors; Power Supply Errors - Omron CJ2 CPU UNIT User Manual

6-1-7

Handling Errors

This section describes the measures to take for the errors that most commonly occur. First check the
error status. Then, make a preliminary determination of the cause of the error, confirm the cause, cor-
rect the error, and take measures to ensure that it will not occur again. For all other errors, refer to A-3
Fatal and Non-fatal Error Details.

Power Supply Errors

A power supply error occurs when a voltage of 5 V is not output from the Power Supply Unit.
POWER
Not lit. Not lit.
Suspected cause of
error
Power is not being
input.
Connection status of
power supply selector
terminals
The voltage is out of
the allowable range for
the power supply.
Power Supply Unit fail-
ure
Failure at another Unit
*1 The following table shows the allowable power supply ranges for each Power Supply Unit model.
Model
CJ1W-PA205R/PA202
CJ1W-PD025
CJ2 CPU Unit Hardware User's Manual
RUN ERR/ALM
Not lit. None
Confirmation method
Use a tester to measure the volt-
age at the input terminals of the
*1
Power Supply Unit.
• 100 VAC:
Use a tester check for short-
circuits.
• 200 VAC:
Check for disconnections.
Use a tester to measure the volt-
age at the input terminals to the
*1
Power Supply Unit.
Replace the Power Supply Unit
and check operation. (Check
whether the POWER indicator is
lit.)
Remove in order the Units
mounted in the Rack and check
the POWER indicator.
Power supply voltage
100 to 240 VAC
24 VDC
Error flag Error code
None
Remedy
Turn the power ON
again.
Reconnect and secure
the terminal connec-
tions.
Correct the power sup-
ply system for the PLC.
Replace the Power
Supply Unit.
Replace the failed Unit. Depends on the type of
Allowable power supply
voltage fluctuation
85 to 264 VAC
19.2 to 28.8 VDC
6 Troubleshooting
Error infor-
mation
None
Prevention of recur-
rence
Investigate the reason that
the power was turned
OFF.
Periodically (approxi-
mately once a year)
tighten the terminal con-
nections.
Same as at the left.
Depends on the type of
error.
error.
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