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

Troubleshooting
144
SLC 5/01 and SLC 5/02 Processor Errors
If the status indicators
indicate
• All status indicators are
off
• Status of SLC 5/02
Comm status indicator
does not matter
• CPU Fault status
indicator is on
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
Publication 1747-UM011G-EN-P - June 2008

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

The following status indicators 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 106.
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 139
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 36. 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 106.