Problems With Points; Table 9: Troubleshooting Problems With Points - Bosch D7412G Installation & Troubleshooting Quick Reference Manual

3.7

Problems with Points

If the switches on a POPIT are set incorrectly, it may create both a missing and extra point. When a missing point is found,
perform a Service Walk Test to search for extra points. See the Owner's Manual for test instructions.
Symptom
Point appears as missing at
command centers and in reports
to the receiver.
Points intermittently appear as
missing. Points are erratic.
One or more points remain in
trouble or alarm with all devices
connected to the sensor loops
normal.
Faulted points do not generate
alarms or troubles as
programmed.
D9412G/D7412G/D7212G Installation & Troubleshooting Quick Reference Guide
© 2004 Bosch Security Systems, Inc.
Diagnosis
POPIT is not
connected or
incorrectly connected
to the data expansion
loop.
D8128C OctoPOPIT
is installed at the last
address on the
ZONEX bus.
Sensor loop switch (1
to 8) is turned off on
D8128D OctoPOPIT.
POPIT is not
programmed
correctly.
Problem with data
expansion loop.
Debounce Count
parameter set at 1. If
an off-board point is
in transition between
normal and faulted
conditions as the
panel scans it, it
appears as missing.
The sensor loop is
open, shorted, or
grounded.
Opens, shorts, or
grounds cause
troubles or alarms
depending on point
programming.
Sensor Reset pressed
at the time the alarm
or trouble was
generated.
Two points are
programmed with the
same address.

Table 9: Troubleshooting Problems with Points

Page 13
D9412G/D7412G/D7212G
Remedy
Verify that a POPIT module programmed for the
missing point number is connected to the data
expansion loop of the correct ZONEX module. Points
9 to 127 connect to ZONEX module 1. Points 129 to
247 connect to ZONEX module 2.
Meter each POPIT to verify the polarity of the data
expansion loop. Voltage should be 9 to 13 VDC at
each POPIT.
Install a D8125 POPEX and D9127 POPITs for points
121-127 on ZONEX 1 and for points 241-247 on
ZONEX 2 when using D8128C OctoPOPITs.
If the sensor loop switch on D8128D OctoPOPIT is
turned off for a programmed point, the point reports
as missing.
Verify that the switches on the POPIT are set for the
missing POPIT number. Switches set incorrectly can
cause both missing and extra POPITs.
Performing a Service Walk Test to search for extra
points may help diagnose the problem.
See Section 3.8 Problems with the D8125 POPEX Data
Expansion Loops on page 15.
It is recommended that the Debounce Count be left at
the default of 2.
Decreasing the Debounce Count to 1 may cause points
to appear as missing. Increasing the Debounce may
cause missed alarms.
Remove the sensor loop from the panel or POPIT and
meter it for continuity. There should be no more than
100 Ω 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. See Section 3.16 Ground Fault
on page 20 for additional information.
The panel ignores input from all points in the same
area programmed for sensor reset during sensor reset.
Points programmed with the same address do not
function correctly. Check to be certain that you have
not duplicated point addresses.
Troubleshooting
43700F