D7212 Installation and Troubleshooting Quick Reference
Page 4
74-06914-000-A 8/93
© 1993 Radionics
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 D7212 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. 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.
Command 47 pressed
at the time the alarm
or trouble was
generated.
The D7212 ignores input from all points in the
same area programmed for sensor reset during
sensor reset (Command 47).
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 D7212’s
ZONEX data terminals
(27 & 28).
A short on 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.
A POPIT has its
switches set
incorrectly and it’s
sensor loop is
shorted.
Check to be certain all POPIT switches are set
correctly.
