Bosch D9412GV2 User Manual

D9412GV2/D7412GV2 | Operation and Installation Guide | 4.0  Installation 

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

17 

 

4.5.3 

Enabling Ground Fault Detection 

To configure the D9412GV2 and D7412GV2 Control 
Panels to enable ground fault detection: 

1. 

Set the silent relay in Area 5 to any value from 1 
to 128. 

Do not use a zero (0) value. 

 

 

The default value for the Area 5 silent relay 
is 0 (zero). The 0 value disables the ground 
fault detection function. 

2. 

Close Switch S4 (Figure 3 on page 16). Refer to 
Table 5 for information about the conditions for 
enabling and disabling the Ground Fault 
Detection Circuit. 

Table 5: 

Ground Fault Detection Status 

 

Ground Fault 
Detection Circuit 

Switch S4 

Value of Area 5 
Silent Relay Alarm 

Enabled 

Closed 

1 to 128 

Closed 0 

Disabled 

Open 

0 to 128 

4.5.4 

D9412GV2 and D7412GV2 Ground Fault 
Specifications 

Table 6 provides the impedance specifications for 
detecting ground faults when any terminal or field 
wiring is shorted to ground. 

Table 6: 

Ground Fault Impedance 
Specifications 

 

Impedance 

Control Panel Detects Ground Fault 

≤ 

300 

Ω

 

Yes 

300 

Ω

 to 

200

 

k

Ω

 

No 

≥

 200 k

Ω

 

Detection depends upon the terminal 

4.5.5 

Locking the Reset Pin 

Locking the reset pin disables the control panel  
(Figure 4). When the control panel is disabled, the 
system ignores the keypads and points. 

CALL FOR 

SERVICE

 appears in keypad displays when the pin is 

locked down. 

On-board relays (Terminals 6 and 7) and off-board 
relays deactivate when the control panel is reset. 
Terminal 8 has power when the relay is deactivated. 
Activation interrupts power at that terminal. The on-
board relay (Terminal 8) remains deactivated when the 
reset pin is locked in the disable position. 

Releasing the reset pin from the closed position resets 
the control panel. The control panel resets all its timers, 
counters, indexes, and buffers. Any points that restore 
after a reset do not generate Restoral Reports. 

If the reset pin is placed in the disable position when 
all areas are armed, there must be an entry in the 
Answer Armed program item. Refer to RPS Parameters 
in the D9412GV2/D7412GV2 Program Entry Guide  
(P/N: F01U003636). 

Locking the pin in the disable position applies power to 
the control panel and charges the battery while the 
detection devices and keypads are installed. 

 

Figure 4: 

Reset Pin 

1

2