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

D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 4.0 Installation
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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 that it hangs
on the hooks. Refer to Figure 2, Item 2 on
page 20.
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

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 14 AWG (1.8 mm) to
16 AWG (1.5 mm) 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.
Bosch Security Systems, Inc. | 7/16 | F01U265457-09
If a ground fault condition occurs, The control
panel generates a ground fault event as a Trouble
Event with Ground Fault in Modem4 and as a
System Ground Fault Trouble 310 in Contact ID.
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 GROUND FAULT. If
communicating in Modem4 format. 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 7 provides the impedance specifications for
detecting ground faults when any terminal or
field wiring is shorted to ground.
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