Installation manual

D9124 Operation & Installation Manual

Page 34

74-06799-000-D 2/96

Alarm Power Output for Indicating Circuits

24 VDC Output Terminals 7 and 9

Each Alarm power output terminal (7 and 9) on the motherboard provides 24 VDC,

1.8 Amps maximum of alarm power output for bells, sirens, piezo fire sounders, and

electronic horns and strobes. Current calculations in

Table 10

are based on a 3 Amp

maximum.

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.

Alarm Power Output Responses

Programming in the

Bell Parameters, Point Index Codes, Point Assignments,

and

Relay

Parameters

determine the response of terminals 7 and 9. See the

D9112 Control/

Communicator Program Entry Guide

(74-06145-000) for programming instructions.

Relay A is terminal 6 on the D9112LTB. Terminal 6 on the D9112LTB controls the output

at terminals 7 and 9 on the D9124 motherboard. Energizing Relay A provides power to

terminals 7 and 9 on the motherboard. The D9112 default program sets Relay A for

A# Fire BellA# Fire Bell

. There is no need to reprogram the relay.