Bosch Appliances D7212G Installation, 3.4Installing the Assembly, 3.5Connecting Earth Ground

D7212G

Installation

3.4Installing the Assembly

1.Place the assembly 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 assembly down so it hangs on the hooks. See Figure 2 on page 21.

2.Remove the tape from the #6x1/4-in. screw in the mounting tab on the assembly. The screw passes through the mounting tab and into the skirt mounting hole in the enclosure. Tighten the screw to secure the assembly in the enclosure.

3.Connect earth ground to the panel before making any other connections. See Section 3.5 Connecting Earth Ground.

3.5Connecting Earth Ground

3.5.1Terminal

To help prevent damage from electrostatic charges or other transient electrical surges, connect the system to earth ground at Terminal 10 before making any other connections. A grounding rod or cold water pipe are recommended earth ground references.

Do not use telephone or electrical ground for the earth ground connection. Use 14-16 AWG wire when making the connection. Do not connect any other panel terminals to earth ground.

CAUTION

3.5.2Ground Fault Detect Enable

GROUND FAULT is defined as “a circuit impedance to Earth Ground of approximately 95 kilohms or less.” The panel will detect a ground fault on Terminals 1-9 and Terminals 11-32 if the Ground Fault Detect Enable jumper (S4) (see Figure 3) is locked (closed) and a non-zero value is entered in Area 5 Silent Alarm Relay (see the D7212G Program Entry Guide [P/N: 4998138538]). When the jumper is in the unlocked (open) position, the panel will not detect ground fault conditions. If a ground fault condition occurs, the command centers will display SERVC GND FAULT and the panel will transmit a TROUBLE REPORT GROUND FAULT AREA (Modem IIIa2 format only). In order for the panel to detect a ground fault condition, the panel must see the ground fault for at least 30 consecutive seconds. When the panel recognizes that ground fault condition is corrected, a RESTORAL report is sent. For the restoral condition to be met, the ground fault must have been corrected for between 5 and 45 consecutive seconds.

The D7212G Control/Communicator logs and prints a Ground Fault event as a Trouble Point 256 if communicating in Modem IIIa2 format. If communicating in BFSK format, the D7212G

IMPORTANT Control/Communicator generates an Alarm Zone 5 event.

3.5.3Locking the Reset Pin

Locking the Reset Pin disables the panel. See Figure 4. The system ignores the command centers and points while disabled. CALL FOR SERVICE appears in command center displays while the pin is locked down.

On-board relays (Terminals 6, 7, and 8) and off-board relays deactivate when the panel is reset. There is power at Terminal 8 when the relay is deactivated. Activation interrupts power at that terminal. The relays remain deactivated while the Reset Pin is locked in the disable position.

		With S4 closed, panel detects
		ground faults.
		With S4 open, panel does not
		detect ground faults.
		GROUND FAULT DETECT
S4	GROUND FAULT	Enabled
		Disabled
	DETECT ENABLE
		PHONE MONITOR SELECT
			LOOP START
			GND START
		GROUND START	RED	PHONE
		Requires		LED
		Relay Model
			ON WHEN
		D136 in Ground
			COMMUNICATING
		Start Socket	OFF WHEN IDLE

Figure 3: Ground Fault Detect

RESET PIN

LOCKED (CLOSED)

	Reset Pin
Disable All Except Battery
Charging And Programming
PERIPHERAL DEVICE CONNECTIONS
RED	POWER +	32	RESET PIN
			NORMAL (OPEN)
YELLOW	DATA BUS A	31
GREEN	DATA BUS B	30
BLACK	COMMON	29

Figure 4: Reset Pin

D7212G Operation and Installation Guide

4998138544C Page 22 © 2003 Bosch Security Systems