21
This section describes the messages that may appear on the 4100 display when using the XPS.
Trouble messages appear on the left as titles, and possible causes are listed to the right in the text.
For communications to work, the XPS requires a 0V connection to the PDM. Be sure to attach a
fast-on connector to the PC board and also ensure that the fuse in the black battery lead is intact.
Voltage has fallen below an acceptable level. A problem may exist in the wiring, in the power
distribution module, or into dedicated AC power.
The battery is not connected or is depleted. The precise status of the battery is given by the SPS.
These modules report “Low Battery.” This trouble is merely to indicate a wiring problem to the
XPS (blown fuse, not connected, etc.).
Either the XNAC card is missing even though the XPS was configured to have one, or there is an
unconfigured XNAC card physically installed.
This Trouble is active when a NAC-to-NAC short is detected. The NACs that are shorted are also
indicated. Any combination of NACs 1 through 6 can be miswired together. The panel displays
up to 4 mis-wiring faults.
Step 6. Troubleshooting
Overview
No
Communications
with Master
AC Power Loss
Battery Not
Connected/
Battery Depleted
Expansion NAC
Card
Configuration
Mismatch
NAC Miswired
Trouble
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