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4.4
Installing the Control Panel
1. Place the control panel over the inside back of the
enclosure, aligning the large rectangular openings
of the mounting skirt with the mounting hooks of
the enclosure. Slide the control panel down so it
hangs on the hooks. Refer to Figure 2 on page 14.
2. Remove the tape from the #6 x 1/4-in. screw in
the mounting tab on the control panel. The screw
passes through the mounting tab and into the skirt
mounting hole in the enclosure. Tighten the screw
to secure the control panel in the enclosure.
3. Connect earth ground to the control panel before
making any other connections. Refer to Section 4.5
Connecting Earth Ground.
4.5
Connecting Earth Ground
4.5.1
Terminal 10
To help prevent damage from electrostatic charges or
other transient electrical surges, connect the system to
earth ground at Terminal 10 before making other
connections. Recommended earth ground references
are a grounding rod or a cold water pipe.
Warning:
Do not use telephone or electrical ground
for the earth ground connection. Use
1.8 mm (14 AWG) to 1.5 mm (16 AWG)
wire when making the connection.
Do not connect other control panel
terminals to earth ground.
4.5.2
Ground Fault Detect Enable
•
A ground fault is a circuit impedance to earth
ground. The control panel has a ground fault
detection circuit that, when enabled, detects
ground faults on Terminals 1 to 9 and 11 to 32.
The control panel also detects and annunciates
ground faults on any device connected to it.
•
To enable ground fault detection, the Ground Fault
Detect Enable jumper (S4) (Figure 3) must be
locked (closed) and a non-zero value must be
entered in the Area 5 Silent Alarm Relay. When
jumper S4 is in the unlocked (open) position, the
control panel does not detect ground fault
conditions.
Bosch Security Systems, Inc. | 5/05 | F01U003805B
D7212GV2 | Operation and Installation Guide | 4.0
•
If a ground fault condition occurs, the keypads
display SERVC GND FAULT and the control panel
sends a GROUND FAULT TROUBLE, AREA 1
(Modem IIIa
When the control panel recognizes that the ground
fault condition is corrected, and remains corrected
for between 5 to 45 consecutive seconds, a Restoral
Report is sent.
The D7212GV2 Control Panel logs and
prints a Ground Fault event as a Trouble
Point 256 if communicating in Modem IIIa
format. If communicating in BFSK format,
the D7212GV2 generates an Alarm Zone 5
event.
Figure 3:
Ground Fault Detection
3
1 - With S4 closed, control panel detects ground
faults.
2 - With S4 open, control panel does not detect
ground faults.
3 - S4, Ground fault detect enable.
2
format only).
1
2
GROUND FAULT DETECT
S4
Enabled
Disabled
ON when
PHONE
communicating
RED
LED
OFF when idle
PHONE LINE SEIZED
TIP
RING
TELCO CORD
MODEL D161
Installation
2
15
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