Installation guide

Bosch Security Systems | 11/03 | 39352E
EN | 56
D9124 | Operation & Installation Guide |
8. Verify the wire removed has an earth ground short
by disconnecting the DVM and switching the DVM
to read ohms. Attach the red lead of the DVM to the
end of the wire that was removed (making sure the
connection is on the conductor of the wire and not
the jacket). Attach the black lead of the DVM to
Terminal 10 of the control panel. If there is an earth
ground short, the reading can range between 0 k
and 95 k.
9. Continue troubleshooting the field wiring to
eliminate the ground. Begin the process by starting
in the middle of the wire run and checking which
side of the wire run has the earth ground short. A
known earth ground is needed for the test.
10. Once the earth ground fault is isolated, remove the
ground, repair the wire, or replace the wire.
11. If the voltage reading represents a ground fault on
Terminals 25, 26, or 28, the ground fault condition
might physically be on either the ZONEX bus,
POPIT bus, or an input point on an OctoPOPIT or
POPIT.
12. Troubleshooting
To isolate the ground fault in this scenario:
- Disconnect the positive and negative leads to the
battery or batteries.
- Connect the jumper wire from Terminal 10 to
Terminal 9 for approximately 5 seconds.
- Points with a ground fault on the input loop
change to an open state while Terminals 9 and 10
are shorted. Do not keep the jumper wire on
Terminals 9 and 10 for longer than 10 seconds.
Only use this procedure to track down ground
fault conditions.
12.17 Panel Buzzer
Beginning with version 6.3 and higher, the control panel
on-board buzzer pulses 1 second on, 1 second off if a
supervised command center no longer responds to polls
from the control panel. The buzzer is silenced when the
supervised command center begins responding to polls
again or by pressing [COMMAND 4] from an
operational command center.