User's Manual

TRAIN CHIEF® II LRCS w/Lightweight OCU OWNER’S MANUAL
95-00-0-xxx Rev 000 7-5 Control Chief Corporation
SLC 500™ Troubleshooting
This section provides a basic troubleshooting guide for the SLC 500™ power supply and
processor modules. Please review the tables below for the fault condition your system is
exhibiting. Additional SLC 500™ troubleshooting information is available in the Allen-Bradley
publication 1746-6.2. If your attempts are not successful in correcting an error condition, please
do not hesitate to contact Control Chief Product Support for assistance. Please refer to the
Chapter 8 for required reporting details and contact information.
WARNING: Do not remove any PLC modules with power applied.
Note: The power supply module LED indicator should be ON when power is applied to the input
terminals, however, the LED could be OFF even when input power is present. Check input
terminals with a volt meter to verify power is removed.
The following SLC 500™ error condition tables provide troubleshooting assistance for SLC
500™ power supply and processor LED states, their potential cause, and recommended actions
to resolve the error condition.
SLC 500™ Error Conditions and Action - System Power
Power
Supply
Processor
POWER RUN
CPU
FLT
Error Cause Actions
OFF OFF OFF
No Line
Power
1. Verify proper line voltage and
connections on the power terminals.
2. Verify proper 120/240V power supply
jumper selection.
OFF OFF OFF
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.
OFF OFF OFF
Power
Supply
Overloaded
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. This problem can occur
intermittently if power supply is slightly
overloaded when output loading and
temperature varies.
OFF OFF OFF
Inadequate
System
Power
Defective
Power
Supply
1. Recheck other probable causes.
2. Monitor the line power to chassis power
supply for possible transient or shorting.
3. Replace power supply.