
126 Chapter 10
Troubleshooting XMU+ Installation
If Alarms Sound to Warn of XMU
+
System Failures
The XMU+ can be connected through the alarm contact pinout on the rear of the
Control card to a light or a buzzer. If a power supply failure or microprocessor system
failure occurs, a contact closure is generated on the alarm connector, which then
triggers the external device (light or buzzer). See Connecting Alarms (optional) on
page 52 for more information).
If this alarm sounds (or flashes), complete the troubleshooting tasks listed in To
respond to alarms from XMU+ to resolve the problem.
To respond to alarms from XMU
+
1. Ensure that the alarm connector is properly wired. See To w ire the alar m
connector on page 53.
2. If the alarm connector is properly wired, proceed to the first troubleshooting
task in If XMU+ Hardware Failures Occur on page 127 (To check for XMU+
power supply failures - Small Chassis).
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