Troubleshooting Fatal Errors - Omron NJ Series Troubleshooting Manual

2 Error Troubleshooting Methods
2-2

Troubleshooting Fatal Errors

The section describes the procedure to troubleshoot fatal errors.
 Power Supply Error
Power is not being input.
The voltage is outside of the allowable
range for the power supply.
Power supply system error caused by
mounted Unit
Power Supply Unit failure
 CPU Unit Reset
A conductive object has gotten inside.
The power supply to an Expansion Rack
is OFF.
The I/O Connecting Cable is incorrectly
installed.
Noise
CPU Unit failure
 Incorrect Power Supply Unit Connected
A CJ-series Power Supply Unit is con-
nected to the CPU Rack.
 CPU Unit Watchdog Timer Error
A conductive object has gotten inside.
Noise
CPU Unit failure
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Cause
Turn ON the power.
Check the Controller's power supply system, and correct it so that the
voltage is within the allowable range.
Remove the Units from the CPU Rack one by one. If the error is elim-
inated, replace that Unit.
If the error persists even after you make the above corrections,
replace the Power Supply Unit.
Cause
If there is conductive material nearby, blow out the CPU Unit with air.
Supply the correct voltage to the Power Supply Unit on the Expansion
Rack.
Correct the connection of the I/O Connecting Cable.
If the error did not result from the above causes, cycle the power to
the Controller and see if that resets the error. If the error occurs fre-
quently, check the FG and power supply lines to see if noise is enter-
ing on them. Implement noise countermeasures as required.
If the error persists even after you make the above corrections,
replace the CPU Unit.
Cause
Connect an NJ-series Power Supply Unit to the CPU Rack.
Cause
If there is conductive material nearby, blow out the CPU Unit with air.
If the error did not result from the above causes, cycle the power to
the Controller and see if that resets the error. If the error occurs fre-
quently, check the FG and power supply lines to see if noise is enter-
ing on them. Implement noise countermeasures as required.
If the error persists even after you make the above corrections,
replace the CPU Unit.
Correction
Correction
Correction
Correction
NJ-series Troubleshooting Manual (W503)