Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 95)

Chapter 8
Troubleshooting
8–4
Identifying Fixed Controller Errors
Refer to the following key to determine the status of the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
Indicates the LED is FLASHING.
The Following
Error Exists
Probable Cause Recommended Action
No Line Power
Verify proper line voltage and connections on the power
terminals.
Power Supply
1. Check the incoming power fuse, check for proper
incoming power connections. Replace fuse.
Inadequate
System Power
Power Supply
Fuse Blown
incoming power connections. Replace fuse.
2. If fuse blows again, replace the fixed controller.
System Power
Power Supply
Overloaded
This problem can occur intermittently if power supply is
lightly overloaded when output loading and temperature
varies. If you are using a 2-slot chassis, verify the
compatibility of the modules to prevent overloading the
backplane power.
The Following
Error Exists
Probable Cause Recommended Action
Processor Not in
Run Mode
Either Improper
Mode Selected or
User Program
Logic Error
1. Verify selected processor mode.
2. If in program/test modes, attempt RUN mode entry.
3. Check user program logic for suspend instructions if
in suspend mode.
Refer to either the Hand-Held Terminal User Manual,
Catalog Number 1747-NP002, or the Advanced
Programming Software User Manual, Catalog Number
1747-NM002.
Line Power Out of
Operating Range
1. Check incoming power connections.
2. Monitor for proper line voltage at the incoming power
connections.
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW