Bosch Appliances Home Security System D9412GV2 User Manual

D9412GV2/D7412GV2 | Operation and Installation Guide | 4.0  Installation 

 

16 

Bosch Security Systems, Inc. | 5/05 | F01U003641B 

 

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 15.  

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.  

•

 

If a ground fault condition occurs, the keypads 
display 

SERVC GND FAULT

 and the control panel 

transmits a 

GROUND FAULT TROUBLE, AREA 1

 

(Modem IIIa

2

 format only).  

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 D9412GV2 and D7412GV2 Control 
Panels log and print a Ground Fault event 
as a Trouble Point 256 if communicating in 
Modem IIIa

2

 format. If communicating in 

BFSK format, the control panels generate 
an Alarm Zone 5 event. 

 

Figure 3: 

Ground Fault Detection 

S4

3

1

2