12
AA-series Audio Amplifiers Manual for DVC-AO Applications —
P/N 52526:B 8/13/2019
Amplifying Audio Messages
AA-30 Operation
3.4 AA-30 Operation
During complete loss of primary (AC) power, the AA-30 operates on secondary (battery) power. To conserve secondary power, no LEDs
light on the AA-30 while operating on batteries.
The amplifier does not indicate a trouble condition until 40 seconds after a fault occur.
P1
P2
Secondary Power (DC)
Battery
– – – + + +
AA3
0l
ob
rd
.w
m
f
Earth
Earth
Primary Power (AC)
HOT
NEUTRAL
Figure 3.4 AA-30 Lower Board Connections (nonpower-limited)
P4 P5 P6 P7
P3
P8
R8
R9
(+) Backup In
(–)
(shield)
(+) Backup Out
(–)
(shield)
(+) High Level Out
(–)
(shield)
(+) High Level Return
(–) (Four wire, supervised)
(shield)
Trouble
A
A
30
up
br
d.
wm
f
High Level Audio Return (Four wire)
High Level Audio Out
Backup High Level Audio Out
Backup High Level Audio In
Trouble Out
Trouble In
Low-level Audio Thru
Low-level Audio In
Unused
Low-level
Audio In
(–)
(+)
(shield)
Resistors R8 & R9 Cut to enable
high-level return for 4-wire mode
Low-level
Audio Thru
(–)
(+)
(shield)
To/F
rom D
V
C
-AO
(Cl
as
s
A)
To/F
rom Speaker-
co
ntrol devices
(i.e. control
modu
les)
Figure 3.5 AA-30 Upper Board Connections (power-limited)