Bosch Appliances D9412GV3, D7412GV3 Enabling Ground Fault Detection, Ground Fault Specifications

D9412GV3/D7412GV3 Operation and Installation Guide 4.0 Installation

If a ground fault condition occurs, the keypads display SERVC GND FAULT and the control panel transmits a GROUND FAULT TROUBLE, AREA 1.

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 D9412GV3 and D7412GV3 Control Panels log and print a Ground Fault event as a Trouble Point 256 if communicating in Modem IIIa2 format. If communicating in Contact ID format, the control panels generate a Ground Fault (310) event.

4.5.3Enabling 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

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1 - S4 Locked (Closed). Control panel detects ground faults.

2 - S4 Unlocked (Open). Control panel does not detect ground faults.

4.5.4Ground Fault Specifications

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

Table 5: Ground Fault Impedance

Specifications

Impedance	Control Panel Detects Ground Fault
≤ 300 Ω		Yes
300 Ω to		Detection depends upon the terminal
200 kΩ
≥ 200 kΩ		No

4.5.5Locking the Reset Pin

Locking the reset pin disables the control panel

(Figure 4). When the control panel is disabled, the system ignores most keypad commands 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 D9412GV3/D7412GV3 Program Entry Guide (P/N: F01U170807).

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 - Reset pin locked (closed)

2 - Reset pin normal (open)

Bosch Security Systems, Inc. 10/10 F01U143070-03 16