Mircom QX-mini Installation And Operation Manual page 123

10.2.2 Circuit Trouble
When a circuit trouble occurs, the Trouble / Trouble Silence indicator will be illuminated, the
Trouble Buzzer will sound, and the Common Trouble Relay will be Active. Additionally, the
corresponding LED on the particular main board will be illuminated. This can be viewed by
opening the panel and looking along the top of the board. To correct the fault, check for open
wiring, shorts, and missing EOL on that particular circuit loop.
10.2.3 Battery Trouble
Check for the presence of batteries, their conditions, and any conduits in QX-mini, QX-mini-
BP, and BC-160 External Battery Cabinets. Low voltage (below 20.4V) will cause a battery
trouble. If battery trouble condition persists, replace batteries as soon as possible.
10.2.4 Trouble / Trouble Silence
If only a Trouble / Trouble Silence is indicated on the main panel and none of those above
confirming trouble indicators are on, then check the following for possible fault.
• consult QX-mini main board for LEDs first. FACP will display more information (if
configured). QX-mini-LOC will display similar information.
• inspect for any missing interconnection wiring
• inspect for improperly secured cabling or cable ties
• appraise state of wires, shielding, isolation components (i.e. ground wire)
10.2.5 Ground Faults
A ground fault indication means that a wire is completing an electrical circuit but not by
following its intended path. The ground fault LED will light when the QX-mini detects a change
in voltage beyond the necessary range for its programming.
To determine location of ground fault:
1. Unplug terminals to isolate involved circuits and/or terminals.
2. Use a voltmeter on the suspect wiring to measure for any out of range voltages, based
on the panel configuration.
3. Replace the necessary components.
4. Once the ground fault is remedied, the ground fault LED will not illuminate and all other
indicators should show normal operation.
System Checkout
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