Terminals 6 And 7; Fire System Power Formula; Terminal 8; Figure 7: Relays For Terminals 7, 8, And Ground Start - Bosch D9412G Operations & Installation Manual

D9412G/D7412G | Operation & Installation Guide |
Incorrect insertion does not damage the relay or the
system; however, the related circuits do not function
properly.

Figure 7: Relays for Terminals 7, 8, and Ground Start

1
2
4
1 - Top of panel.
2 - Left side of panel.
3 - The D136 Relays are inserted with the three pins
toward the top of panel.
4 - Bottom of panel.
5.4.3

Terminals 6 and 7

When activated, Terminals 6 (Relay A) and 7 (Relay B),
provide positive (+) 10.2 VDC to 13.9 VDC power
output. Use the power at Terminals 6 and 7 to power
bells, siren drivers, piezo fire sounders, electronic horns,
or other devices. Programming determines the format of
the output and the conditions that activate it. One PTC
protects Terminals 6, 7, and 8 against shorts.
Bosch Security Systems | 10/03 | 43488E
5.0 Power Outputs
ALT ALARM
SW AUX
3
GND START
Available Power
The system combines the 1.4 A of primary power
produced by the power supply with the secondary power
source (the battery) to produce a total of 2.0 A of alarm
power at 10.2 VDC to 13.9 VDC. Terminals 6 and 7
share the available alarm power.
Power Restricted for Fire and Combined Fire/
Burglary Systems: Fire systems are prohibited from
using the battery for determining alarm power. Use the
fire system power formula below to calculate the current
available for fire and combined fire/burglary systems.
5.4.4

Fire System Power Formula

To calculate the current available at Terminals 6 and 7
for fire and combined fire/burglary systems:
1. Add together the current draws for all devices
connected to Terminals 3, 8, 24, and 32, and the
accessory connector. This is the total current
required for the Normal Standby Condition (NSC).
2. The current available for NSC is 1.4 A. Subtract the
NSC current required calculated in Step 1 from the
NSC current available, 1.4 A. The difference is the
alarm current available for Terminals 6 and 7.
In formula format:
1.4 A – NSC current required
(Step 1)
Refer to the D9412G/D7412G Approved Applications
Compliance Guide for module/accessory current
requirements.
5.4.5

Terminal 8

Terminal 8 provides continuous positive (+) 10.2 VDC
to 13.9 VDC power. Relay C interrupts the power at
Terminal 8 when activated. Use Terminal 8 to power
smoke detectors or other devices that are reset by
interrupting power. One self-resetting circuit breaker
protects Terminals 6, 7, and 8 against shorts.
Verification/Reset Relay
The default program sets Relay C (Terminal 8) as a
verification/reset relay. See Relay Parameters and Point
Assignments in the D9412G/D7412G Program Entry Guide
for instructions on programming verification/reset
relays and points.
Performing a sensor reset at a command center produces
a 5-second relay activation of verification/reset relays.
The panel ignores verification/reset points during the 5
seconds of relay activation.
EN | 26
= Alarm current
available