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Audio Command Center Series Manual — P/N 51889:E1 6/8/2010 81
One Speaker Circuit With Backup on ACC-25/50 Application Examples
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 5.1.
5.2 One Speaker Circuit With Backup on ACC-25/50
Single Output Zone, Single Input Channel (see Table 2.7 on page 37 for Message Control switch
settings)
Another application consists of one ACC-25/50 Series with one amplifier and a single speaker cir-
cuit. A second amplifier can be installed as a backup if desired. This configuration is suitable for
small facilities requiring no more than 25 watts of output power. A single 60 second fire evacua-
tion message will be generated during an alarm condition from the host FACP or manually by a
message push-button.
In this application, the NAC from the host FACP is connected to CMD1. The CMD1 out terminals
are then terminated with an EOL resistor for the FACP's Style Y NAC or the terminals are wired
back to the host FACP for a Style Z NAC. S3 DIP switches 1, 2 and 3 are set to OFF which causes
a 60 second message to be sent to the speaker circuit when CMD1 input is activated. S5 DIP
switch 5 is set to OFF which causes CMD1 input to be activated by a reverse polarity condition.
CMD3, CMD4, and CMD5 inputs require End-of-Line resistors and CMD2 cannot be used to trig-
ger the ACC-25/50.
IMPORTANT! When CMD1 is configured for reverse polarity, the NAC cannot
be Coded.
Figure 5.1 One 25 Watt Speaker Circuit
FACP ELR resistor
(for Style Y only)
Style Z
ACC-25/50 Series
Main Circuit Board
Style Z
a
c
2
5
a
p
p
5
.
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 only
for Style Y - Class B
4.75K, 1 watt P/N:75470
4.7K ELR resistors (P/N: 27072)
First Amplifier
Mounted on Main Circuit Board
Keypad Example
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
a
c
c
2
5
k
y
b
l
n
k
.
w
m
f
BUILDING
SPEAKERS
FIRE
MESSAGE
POWER ON
SYSTEM
TROUBLE
MESSAGE
TROUBLE
GENERATOR
TONE
GENERATOR
TROUBLE
RECORD
PLAYBACK
TROUBLE
SILENCE
MICROPHONE
TROUBLE