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One Speaker Circuit With Backup
5.2
One Speaker Circuit With Backup
Another application consists of one FIRE•COMMAND•25/50 with one amplifier and a single speaker circuit. A sec-
ond 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 evacuation message will be generated during an alarm
condition from the host FACP or activation of the Manual Evacuate switch.
In this application, the NAC from the host FACP is connected to CMD1. The CMD1 out terminals are then termi-
nated 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. S5 DIP switch 2 is set to OFF which causes the speaker circuit to be activated by the CMD1 input. S5
DIP switch 5 is set to OFF which causes CMD1 input to be activated by a reverse polarity condition.
Backup Amplifier switch S1 is set to the 'Backup ON' position. 18 AWG or larger jumpers connect the Backup
Amplifier TB2 Terminal 3 and Main Amplifier TB2 Terminal 2 as well as Backup Amplifier TB2 Terminal 4 and
Main Amplifier TB2 Terminal 1. Upon failure of the first or main amplifier, the audio from the backup amplifier will
be switched out to the speakers.
Note that in the optional 70.7 V RMS configuration, only the amplifier is backed-up; the FC-X RM70 coupling trans-
former is not. For this reason, it is not necessary to install an FC-X RM70 transformer module on the backup
amplifier.
One 25 Watt Speaker Circuit With Backup
FIGURE 5-2:
Style Z
FACP EOL Resistor (Style Y only)
FIRE•COMMAND•25/50 Main
Circuit Board
Style Z
Model R-20K, ½ watt
EOL resistor P/N: 75477
(Style Y - Class B only)
Backup
Backup
Audio Out
Audio In
Supervisory
Polarity Shown
Technical Manuals Online! - http://www.tech-man.com
39
Document #50580
Rev. C
8/12/97
P/N 50580:C
firealarmresources.com
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