8
Note:
The audio controller and amplifiers must be set up for a 1 V p-p input.
This is done by ensuring the following components are removed:
•
Audio Controller (562-894): R85, R90 and C118 must be
removed.
•
25 W Amplifier (562-904 – 25 V or 70 V): R28, R31 and C28
must be removed.
•
100 W Amplifier (562-907 – 25 V or 70 V): R4, R10 and C5 must
be removed.
The audio repeaters require 100 mA at 24 VDC. The connection for power is a
removable two place terminal connector on the audio repeater. Using the power
harness supplied, cut the wires to length by removing one end of the harness.
Power may be connected to an applicable tap on a power supply in the host
panel.
The master and slave audio repeaters have two sets of contacts that are closed as
long as the audio repeater is receiving a carrier. A loss of carrier to input “A” or
“B” causes the respective contacts to open. In order to supervise the audio
repeater fiber connections these contacts are typically connected in series with
the EOL resistor in a local monitor circuit such as a zone or ZAM. If separate
annunciation is desired, two monitor circuits are required.
Reference Figures 4 and 5 and the notes on Page 9.
CARRIER (ON=OK)
4
3
2
CHNL B
**
TO LOCAL
ZONE TO
ANNUNCIATE
TROUBLE
CUT AND STRIP
AS REQUIRED
TAPE SHIELD BACK
CUT AND STRIP
AS REQUIRED
UN-SHIELDED
SHIELDED
562-894
AUDIO CONTROLLER
P9
*
EOL
WHITE
BLACK
4100
POWER
SUPPLY
BLACK
RED
CHNL A
NOT USED
4190-9011
MASTER FIBER OPTIC
AUDIO MODEM
P/N 618-019
INSTALLATION INSTRUCTIONS:
574-795 REV _
AUDIO IN
(2V P-P MAX)
GND
1
CHNL A
CHNL B
FIBER
XTMR
FIBER
REC
CARRIER (ON=OK)
POWER
FIBER
XTMR
FIBER
REC
4
3
6
5
2
1
POWER
0V
+V
2
1
**
SUPERVISION
CONTACTS
CLOSED=OK
Figure 4. Master Connections
Continued on next page
Internal Wiring Connections,
Continued
Slave Audio Repeater Audio
Output
(Continued)
Power Input
Supervision (Fault) Loop
*
Connect to P9 for CHNL 1, P8 for CHNL 2, or P7 for CHNL 3.
**
Contacts not used for Class B fiber configuration.
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