ATPC Manual
7
Channel 2 terminals provide the following:
Pre-amp In - From the FCCA, Audio Distribution board, (pre-amp out)
at the FCCA panel. If multiple amplifier terminal panels are used
connection is from Pre-amp Out Ch #2 of the previous ATP.
Pre-amp Out - to next Amplifier terminal panel (Pre-amp IN) or if it is
the last Amplifier terminal panel these terminals must be terminated
according to the amplifier termination chart located in the two previous
sections.
Pre-amp Out - To Amplifier Input - To the High Z input on the
amplifier.
Amp In - From the 70 V or 25 V output of the amplifier.
Amp Out - to be connected to IRC panels audio zones and terminated
at the last panel on the line with a riser supervisory module (P/N
130057). Each riser may not be greater than 180 W.
ATP External Battery Charger
The audio power amplifiers must be provided with battery back up
when primary power has failed and the audio system has been
activated.
Two different methods may be used to charge the batteries. The ATP
(amplifier terminal panel) has an integral battery charger capable of
charging 40 AH of batteries. The battery chargers of multiple ATPs
may NOT be connected in parallel to increase charger current. When
multiple amplifiers are to be powered from a single battery source, the
ATP charger must be disabled by installing J3 and removing J2 on the
APSB terminal board which is located in the Amplifier Terminal Panel.
When the amplifier back up is to be supplied from a single battery
source an external battery charger must be used. The external battery
charger that must be used is a La Marche model A33-10-24. Battery
power is applied to the amplifiers via the amplifier terminal panel.
When calculating the batteries required for the amplifiers, the alarm
current must be known. Each amplifier must be connected into the
system to draw a maximum of 20 Amperes @ 24VDC. The local
authority having jurisdiction or local codes will specify the amount of
time that standby power must be provided.
The chart below shows the possible battery combinations and battery
cabinets required for the amplifier rack to provide 5 minutes of alarm at
various power levels.
5 Minute Alarm Backup
All Call Amplifier Power
Size
Model
Quantity
50 Watts
6.5 AH
PS 1265
2
100 Watts
6.5 AH
PS 1265
2
250 Watts
15 AH
PS 12150
2
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