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 te rminals
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 StyleZ 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
ac25app5.wmf
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
acc25kyblnk.wmf
BUILDING
SPEAKERS
FIRE
MESSAGE
POWER ON
SYSTEM
TROUBLE
MESSAGE
TROUBLE
GENERATOR
TONE
GENERATOR
TROUBLE
RECORD
PLAYBACK
TROUBLE
SILENCE
MICROPHONE
TROUBLE