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D9124 Operation & Installation Manual

Page 33

74-06799-000-D 2/96

Power Output

Auxiliary Power Outputs

All external connections at the D9124 motherboard are Power Limited.

12V Auxiliary Power from D9112LTB Terminal 1

The D9124 supplies 1.4 Amps at 10.2 to 14 VDC to power auxiliary devices. A self-

resetting circuit breaker protects the circuit against shorts. Devices powered from this

output must operate within a range of 10.2 to 14 VDC.

24 VDC Power from Motherboard Terminal 5

Use terminal 5 to power smoke detectors or other devices that are reset by interrupting

power. Performing a DETECTOR RESET from the command center momentarily

interrupts 24 VDC power to terminal 5 to reset the smoke detectors.

Power Output Depends on Standby Time Requirements

If your standby requirements call for 24 Hours standby time, the D9142 Power Supply

provides up to .136 Amps at terminal 5 on the motherboard with 3 Amps of bell current

available for five minutes of alarm after a 24 hour period of AC power loss. To increase

this output, use larger capacity batteries in an additional enclosure (up to 38Ah, see

Table 10

If your application requirements call for 60 hours of standby time, the D9142 provides

.030 Amps of standby current at terminal 5 on the motherboard with 3 Amps of bell

current available for five minutes of alarm after a 60 hour period of AC power loss. To

increase this output, use larger capacity batteries in an additional enclosure (up to 38Ah,

see

Table 10

See the

Auxiliary Current and Standby Battery Requirements

section,

Calculations for 24

VDC Devices

for more information about standby time and available power output.

Total output power for the D9124 must not exceed 4 Amps:

The total output power

for auxiliary power (terminal 5), and the 24 VDC indicating circuits (terminals 7 and 9)

must not exceed four Amps. Exceeding four Amps will overload the D9142 Power

Supply. See the

Auxiliary Current and Standby Battery Requirements

section,

Calculations for 24 VDC Devices

for more information.

Verification/Sensor Reset Relay

Relay B is terminal 7 on the D9112 board. Terminal 7 on the D9112LTB controls the

output at terminal 5 on the D9124 motherboard. When Relay B is energized for

DETECTOR RESET or alarm verification, power to terminal 5 of the D9124 is interrupted.

The D9112 default program sets Relay C for

A# Reset SensorsA# Reset Sensors

. Reprogram

A#A#

Reset Sensors Reset Sensors

for Relay B.

See

Area Parameters A# Verify TimeA# Verify Time,

Point Index Codes

Digits 3 and 6, and

Relay

Parameters

A# Reset Sensors A# Reset Sensors

in the

D9112B Program Entry Guide

(74-06145-000) for

instructions on programming verification/reset relays and points.

Pressing DETECTOR RESET activates verification/reset relays for five seconds. The

panel ignores verification/reset points while the relay is activated.