Bosch D6412 - Sensor Loop 1 Specific Configuration; Single Point Loop Configuration (Points 2-8)

D6412/D4412 Operation and Installation Guide
Page 28 © 2003 Bosch Security Systems45349E
D6412/D4412
On-Board Sensor Loops
7.4 Sensor Loop 1 Configuration
Sensor Loop 1 (see Figure 10) can be used for applications other than a fire point. This sensor loop cannot be used for point
doubling and must be terminated with a 2.21 kΩ EOL resistor (P/N: 25899).
Loop resistance limits the number of Normally-Open and/or Normally-Closed detection devices each sensor loop can
supervise. The total resistance for wire length and contacts, minus the EOL resistor, must not exceed 100 Ω.
+
100
Ω
MAXIMUM
-
L1
2.21 K
Ω
EOL Resistor
(P/N: 25899)
COMBINATION: NORMALLY OPEN CONTACTS
AND NORMALLY CLOSED CONTACTS
Figure 10: Sensor Loop 1 Wiring
7.5 Single Point Configuration (Points 2 to 8)
When wiring the on-board sensor loops in the single point configuration, install the resistor with the appropriate value
(2.2 kΩ and 3.65 kΩ are provided) at the far end of the sensor loop to provide a reference for supervision. You can connect
dry contact sensing devices in series (normally-closed) and/or in parallel (normally-open) to any of these loops
(see Figure 11).
POINT INPUT
TERMINAL
COMMON
POINT INPUT
TERMINAL
COMMON
NORMALLY OPEN CONTACTS
COMBINATION: NORMALLY OPEN CONTACTS
AND NORMALLY CLOSED CONTACTS
100
Ω
MAXIMUM
EOL Resistor P/N: 47819
2.2 K
Ω
L
2 to L8
Figure 11: Single Point Sensor Loop Wiring
The number of normally-open and/or normally-closed detection devices each sensor loop can supervise is limited only by
the resistance on the loop. The total resistance for wire length and contacts, minus the EOL, must not exceed 100 Ω.
You can determine the condition of the on-board sensor loops in the default configuration (single point, 2.2 kΩ EOL
resistor) by measuring the voltage across the point input terminal and one of the common terminals. The sensor loops must
be connected and the 2.2 kΩ EOL resistor in place.
Table 5 shows the on-board sensor loops for D6412/D4412 Loops 2 through 8.
EOL Resistor Open Loop Normal Loop Shorted Loop
2.21 K Greater than 7.7 VDC Greater than 6.3 VDC, less than 7.3 VDC Less than 6.0 VDC
3.65 K Greater than 9.1 VDC Greater than 7.7 VDC, less than 8.6 VDC Less than 7.3 VDC
1.0 K Greater than 5.0 VDC Greater than 3.8 VDC, less than 4.7 VDC Less than 3.5 VDC
Table 5: On-Board Sensor Loops