Installing The Control Panel; Connecting Earth Ground; Terminal 10; Ground Fault Detect Enable - Bosch D9412GV4 Installation And Operation Manual

D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 4.0
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 that it hangs
on the hooks. Refer to Figure 2, Item 2 on
page 16.
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.
Caution: 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

To meet UL 864 requirements, enable
Ground Fault Detect.
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.
If a ground fault condition occurs, the keypads
display SERVC GND FAULT and the control panel
transmits a GROUND FAULT TROUBLE, AREA 1.
Bosch Security Systems, Inc. | 3/12 | F01U266054-01
When the control panel recognizes that the
ground fault condition is corrected, and remains
corrected for between 5 to 45 consecutive sec, a
Restoral Report is sent.
The D9412GV4 and D7412GV4
Control Panels log and print a Ground
Fault event as a Trouble Point 256 if
communicating in Modem IIIa
If communicating in Contact ID
format, the control panels generate a
Ground Fault (310) event.
4.5.3

Enabling Ground Fault Detection

To enable Ground Fault Detect Enable, lock
(close) the S4 Ground Fault Detect Pin on the
control panel (Figure 3).
Figure 3: Enabling Ground Fault Detection
1 - S4 Locked (Closed). Control panel detects
ground faults.
2 - S4 Unlocked (Open). Control panel does not
detect ground faults.
4.5.4

Ground Fault Specifications

Table 5 provides the impedance specifications for
detecting ground faults when any terminal or
field wiring is shorted to ground.
Installation
2 format.
17