D9000/D7000 Series Operation & Installation Manual
Page 20
74-07692-000-C 4/97
Relay Installation
Power down the system before inserting the
D136 relays. The plug-in relays are shorter than
the sockets they plug into. See Figure 6. You can
install them in either the left or right end of the
socket.
Don’t rely on relay labelling:
You shouldn’t rely on the labelling to install D136
relays. Check for the side with three pins. The
three pins go on the top side.
Incorrect insertion does not damage the relay or
the system, however the related circuits do not
function properly.
Terminals 6 and 7
Terminals 6 (relay A) and 7 (relay B), provide
positive (+) 10.2 VDC to 13.9 VDC power output
when activated. 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 self-
resetting circuit breaker protects terminals 6, 7,
and 8 against shorts.
Available Power
The system combines the 1.4A of primary power
produced by the power supply with the
secondary power source (the battery) to produce
a total of 2.0A of alarm power at 10.2 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.
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, the Expansion Port (J4), and the
Accessory Connector (J2). This total is the
total current required for the Normal Standby
Condition (NSC).
2.
The current available for Normal Standby
Condition (NSC) is 1.4A. Subtract the NSC
current required calculated in step 1 from the
NSC current available, 1.4A. The difference
is the Alarm Current available for terminals 6
and 7.
In formula format:
1.4A – NSC current required (step 1) = Alarm
Current available
Refer to the Battery Standby Chart in the
D9000/
D7000 Series Approved Applications
Compliance Guide (74-07693-000) for module/
accessory current requirements.
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 the
Relay Parameters
and
Point Assignments modules in the D9000/
D7000 Series Program Entry Guide (74-07695-
000) 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.
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