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82

Audio Command Center Series Manual — P/N 51889:E1  6/8/2010

Application Examples

Backup Amplifier switch S1 is set to the ‘Backup ON’ position.  18 AWG or larger jumpers con-
nect the Backup Amplifier TB2 Terminal 3 and Main Amplifier TB2 Terminal 1 as well as Backup 
Amplifier TB2 Terminal 4 and Main Amplifier TB2 Terminal 2.  Upon failure of the first or main 
amplifier, the audio from the backup amplifier will be switched out to the speakers.

In this application, the system may also be manually activated via the keypad by selecting the 
Building Speakers zone push-button followed by the selection of the Fire Message push-button, or 
by using the microphone to make an announcement.  Refer to the Keypad example in Figure 5.2

In the optional 70.7 V

RMS

 configuration, only the amplifier is backed-up; the FC-XRM70 coupling 

transformer is not.  For this reason, it is not necessary to install an FC-XRM70 transformer module 
on the backup amplifier.  

Style Z

FACP ELR Resistor 
(for Style Y only)

Style Z

Backup
Audio In

Backup
Audio Out

Supervisory 
Polarity Shown

a

c2

5

a

pp

4.

w

m

f

Note: Typical illustration of a 
Fire•Lite control panel.  Refer to the 
Command Input Specification in 
Section 1.2,  ”Specifications” on 
page 19, for the voltage range.

ELR Resistor required for
Style Y - Class B only
4.75K, 1 watt P/N:75470

4.7K ELRs PN: 27072

Make no connections to CMD2
(S5 DIP switch 6 is OFF)

4.7K

 ELR

Alarm Polarities Shown

Host FACP

NAC

Alarm Polarities Shown

Speaker          Backup

Speaker           Backup

Backup ON

a

cc

25

ky

bl

nk

.w

m

f