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Note #3: Telephone Riser
Maximum Riser Circuit Cable Resistance = Max Riser Volt Drop / Total Firefighter Jack/Phone Current.
Max Riser Volt Drop = 5V
Total Firefighter Jack/Phone Current (A) = (number of phones x 0.0063) + 0.08
Examples:
Number of Firefighter Jacks/Phones
Max Cable Resistance (ohms)
5 44
10 34
15 28
20 24
25 21
30 18
35 16
10 Maintenance & Troubleshooting
The system shall be inspected, tested and maintained in
accordance with the recommendations outlined in
NFPA72.
The recommendations provide for weekly, monthly,
quarterly, bi-annual and annual inspections/tests.
Adequate records shall be maintained to document all inspections, tests and maintenance undertaken. Trouble
conditions and their resolution to normal shall be recorded.
The AX-CTL-1L, AX-CTL-2 or AX-CTL-4 intelligent fire alarm control panel includes ground fault monitoring and
detection. To test the ground fault circuitry, place a 100K resistor in series with a wire from the positive or negative
(positive or negative ground fault) terminal of the auxiliary power supply output to ground.
The Advanced intelligent detectors employ a drift compensation and automatic sensitivity adjustment feature. The
panel will indicate a trouble condition when the drift compensation reaches a point where alarm sensitivity cannot be
maintained.
The AX-CTL-1L, AX-CTL-2 and AX-CTL-4 intelligent fire alarm control panel provides integral electronic meters to
check the operation of the batteries, charger, and input and output circuits. The charging voltage and charging
current can be read from the panel display. The batteries are also automatically subjected to a load equivalent to full
load during normal operation. If the internal resistance of either battery rises beyond approximately 0.8 ohm, then
the panel will report a battery trouble condition.
10.1 Troubleshooting
Designed with the technician in mind, each module of the AX-CTL-1L, AX-CTL-2 or AX-CTL-4 intelligent fire alarm
control panel is easy to install and service. All inputs and outputs of the AX-CTL base card are addressable and
provide precise information of status condition. The power supplies offer status LEDs, temperature compensated
charging, and the ability to operate directly from the batteries when AC supply is not yet available at the installation
site. A user-friendly built-in intelligent multi-meter allows technicians to interrogate any input/output and diagnose
potential time consuming trouble issues.
In addition to all of the AX-CTL-1L, AX-CTL-2 and AX-CTL-4 intelligent fire alarm control panel capabilities, the
Advanced Remote Diagnostic Virtual Panel Simulator offers technicians the ability to access the AX-CTL-1L, AX-
CTL-2 or AX-CTL-4 intelligent fire alarm control panel (w/integral modems) remotely. The Remote Diagnostic Virtual
Panel emulates the onsite AX-DSP alphanumeric graphic display in real time from an offsite location.
R
72
Inspection, Testing
& Maintenance
