Identifying Slc 5/01 And Slc 5/02 Processor Errors - Allen-Bradley SLC 500 User Manual

10-4 Troubleshooting
SLC 5/01 and SLC 5/02 Processor Errors
If the LEDs Indicate
• All LEDs Off
• Status of SLC 5/02
Comm LED does not
matter
• CPU Fault LED On
• All Other LEDs Off
• Status of SLC 5/02
Comm LED does not
matter
Publication 1747-UM011C-EN-P - December 2001

Identifying SLC 5/01 and SLC 5/02 Processor Errors

The following LEDs and tables provide you with information
regarding error messages, possible cause(s) for the error, and
recommended action to resolve the error.
The Following Probable Cause
Error Exists
Inadequate system No line power
power
Power supply fuse
blown
Power supply
overload
Defective power
supply
Inadequate system Improper line
power power voltage
selection
Recommended Action
1. Verify proper line voltage and connections on the power
terminals.
2. Verify proper 120/240V power supply jumper selection.
See page 6-7.
1. Check the incoming power fuse, check for proper
incoming power connections. Replace fuse.
2. If fuse blows again, replace the power supply. See page
9-7 on fuse replacement.
1. Remove line power to power supply. remove several
output modules from the chassis. wait five minutes.
reapply power.
2. If condition reoccurs, re-calculate module configuration
power required and verify proper power supply selection.
See page 2-13. This problem can occur intermittently if
power supply is slightly overloaded when output loading
and temperature varies.
1. Recheck other probable causes.
2. Monitor the line power to chassis power supply for
possible transient or shorting.
3. Replace the power supply.
Verify proper 120/240V power supply jumper selection. See
page 6-7.