AFP-400 Installation
PN 50253:A2 03/12/96
4-23
System Configuration Drawings
This drawing illustrates the use of two AA-30 Audio Amplifiers with a
backup AA-30. These four speaker circuits share 30 watts from one AA-30.
The AA-30 on the left serves as the backup.
1) Set FFT-7 SW1 for Four-wire operation (down position).
2) Mount resistor R470 across P3-4 and P3-5 on the last amplifier.
Cable 75097
Backup
Amplifier
Cable 75110
Cable 75110
Cable 75121
Cable 75109
Backup Amplifier Block Diagrams
Wiring an Audio Signal with a Backup Amplifier
Block Diagrams
One backup amplifier
per system or group of
amplifiers
One backup amplifier for
each system amplifier.
System
Amplifier
Item
Supplied with
Part Number
Low level Audio cable
AA-30, AA-100, AA-120
75100
Telephone cable
VTCC-1 package
75121
25-volt Audio cable
AA-30, AA-100, AA-120
75109
Cable
FFT-7
75097
470 ohm resistor
AMG-1
R470
Wiring Inventory
Field wiring to
telephone circuit
Field wiring to
speaker circuit
Resistor R470
Resistor R470 mounted across
terminals 4 and 5 on the last
audio amplifier.
AMG-1
AFP-400 Audio Signal Wiring
Using a Backup Amplifier
Wiring Diagram
VCM-4
VCM4
Use 18AWG to 12AWG twisted-
pair cable for EIA-485
connections.
CPU-400
FFT-7
This wiring diagram applies to
AA-30, AA-100, and AA-120
audio amplifiers. Connections
to plugs P1, P2, P4, P5, P6, P7,
P9, and P10 are identical.
