D9000/D7000 Series Installation and Troubleshooting Quick Reference
Page 5
33317D 4/97
Problems with Points
(Continued)
Symptom
Diagnosis
Remedy
One or more
points remain in
trouble or alarm
with all devices
connected to the
sensor loops
normal.
The sensor loop is
open, shorted, or
grounded.
Opens,shorts, or
grounds cause
troubles or alarms
depending on point
programming.
Remove the sensor loop from the
D9412/D9112 or POPIT and meter it for
continuity. There should be no more than
100 ohm resistance, plus the value of the
end of line resistor on the wires. If you
meter less resistance than the value of the
end of line resistor, check the wiring for
shorts.
With the wires for the loop removed, meter
them for continuity to ground. A ground
before the end of line resistor on an on-
board point’s sensor loop is interpreted as a
short. A ground on a sensor loop for a
POPIT point is interpreted as an open.
Faulted points do
not generate
alarms or troubles
as programmed.
Sensor Reset pressed
at the time the alarm
or trouble was
generated.
The D9412/D9112 ignores input from all
points in the same area programmed for
sensor reset during sensor reset.
Two points are
programmed with the
same address.
Points programmed with the same address
do not function correctly. Check to be
certain that you have not duplicated point
addresses.
Panel transmitts
PT BUS
TROUBLE
reports.
Erroneous alarm
and/or trouble
reports may follow
PT BUS
TROUBLE report.
Erroneous alarm
and/or trouble
events for off-
board points
appear at
command centers.
Short on D8125
POPEX module’s Data
Expansion Loop or
short on D9412/D9112
ZONEX data terminals
(25 & 26, or 27 & 28).
A short on either the Data Expansion Loop
or the ZONEX data terminals generates a
PT BUS TROUBLE report.
While the short remains, the panel responds
as though the sensor loop for each point
connected to the POPEX module was
shorted.
Check wiring for shorts.
The POPIT address
switches are set
incorrectly (for points
128 or 248) or the
OctoPOPIT address
switches are set
incorrectly (for points
121-128 or points 241-
248).
Check to be certain all POPIT and
OctoPOPIT address switches are set
correctly. POPITs cannot be used for points
128 or 248 (these are reserved for panel
functions). OctoPOPITs cannot be used for
points 121-128 or 241-248.
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