Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 144)

Publication 1747-UM011G-EN-P - June 2008
144 Troubleshooting
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.
SLC 5/01 and SLC 5/02 Processor Errors
If the status indicators
indicate The following
error exists Probable Cause Recommended Action
• All status indicators are
off
• Status of SLC 5/02
Comm status indicator
does not matter
Inadequate system
power
No line power. 1. Verify proper line voltage and connections on the power
terminals.
2. Verify proper 120/240V power supply jumper selection. See
page 106.
Power supply fuse
blown.
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.
Power supply
overload.
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.
Defective power
supply.
1. Recheck other probable causes.
2. Monitor the line power to chassis power supply for possible
transient or shorting.
3. Replace the power supply.
• CPU Fault status
indicator is on
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
Inadequate system
power
Improper line
power voltage
selection.
Verify proper 120/240V power supply jumper selection. See
page 106.