Omron NJ Series Troubleshooting Manual

2 Error Troubleshooting Methods
2-4
NJ-series Troubleshooting Manual (W503)
2-2 Troubleshooting Fatal Errors
The section describes the procedure to troubleshoot fatal errors.
 Power Supply Error
 CPU Unit Reset
 Incorrect Power Supply Unit Connected
 CPU Unit Watchdog Timer Error
Cause Correction
Power is not being input. Turn ON the power.
The voltage is outside of the allowable
range for the power supply.
Check the Controller’s power supply system, and correct it so that the
voltage is within the allowable range.
Power supply system error caused by
mounted Unit
Remove the Units from the CPU Rack one by one. If the error is elim-
inated, replace that Unit.
Power Supply Unit failure If the error persists even after you make the above corrections,
replace the Power Supply Unit.
Cause Correction
A conductive object has gotten inside. If there is conductive material nearby, blow out the CPU Unit with air.
The power supply to an Expansion Rack
is OFF.
Supply the correct voltage to the Power Supply Unit on the Expansion
Rack.
The I/O Connecting Cable is incorrectly
installed.
Correct the connection of the I/O Connecting Cable.
Noise 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.
CPU Unit failure If the error persists even after you make the above corrections,
replace the CPU Unit.
Cause Correction
A CJ-series Power Supply Unit is con-
nected to the CPU Rack.
Connect an NJ-series Power Supply Unit to the CPU Rack.
Cause Correction
A conductive object has gotten inside. If there is conductive material nearby, blow out the CPU Unit with air.
Noise 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.
CPU Unit failure If the error persists even after you make the above corrections,
replace the CPU Unit.

Omron NJ Series Specifications

General

Brand	Omron
Model	NJ Series
Category	Controller
Language	English