Atkinson Dynamics AD-28LD-MV Manual de instruções de instalação e manutenção - Página 3

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A. GENERAL FEATURES.
The AD-28LD-MV intercom is a 2-way communications device
designed for light duty industrial applications. Nominal operating
voltages include 120/240 Vac, 50/60 Hz and 24 Vdc. Voltage changes
for the 120/240VAC are internally switch selectable and the AC line
is fused with a 1/2 amp 250 volt type GMC fuse. The unit also offers
internally selectable balanced or unbalanced line operation, trans-
former isolated audio inputs and internally selectable Master or Slave
mode configurations. A call button with remote call dry contacts is
also factory supplied in the unit. The AD-28LD-MV has a Type 1 en-
closure and is a UL Listed signal appliance.

MASTER MODE:

Each intercom can be configured as a Master unit (Push-to-Talk)
or a Slave unit (Push-to-Listen) by changing the MAS/SLA jumper
(J3) on the printed circuit board (see figure 1). The intercom comes
from the factory set in the Master (MAS) mode.
In the Master mode the intercom acts as an amplifier, constantly
broadcasting over its speaker any signal that it receives on the signal
lines. Holding down the Listen/Talk switch changes the unit from a
speaker to a microphone (see figure 2). The intercom will now trans-
mit over the signal lines to additional intercom(s) also set in the
TO SPEAKER
120VAC/240VAC
SWITCH
FUSE
CLASS I WIRING
Q1
T1
C3
H1
J1
C4
S
P
K
R
C5
H2
CR1
R1
K1
C1
CR2
C2
T3
SW1
120VAC
1/2A
1
250V
GMC-1/2
F1
240VAC
REPLACE
WITH
SAME
TYPE
FUSE
ONLY
CM
J2
IC1
R4
C12
R5
C6
IC2
C7
R6
C10
C11
C8
R7
R2
C14
R3
R8
C17
Q2
R9
C9
C18
R10
J6
C19
S
R11
W
C20
I
T
R12
C
H
J3
R13
>SLA
R14
>MAS
T2
R15
C13
R16
CR3
>BAL
>UNB
J5 R17
J4
CR4
CR5
Q3
CR6
CR7
R18
24VDC
IN/OUT
R19
GROUND
REMOTE
K2
CONTROL
REMOTE
SPEAKER
EXT
CALL
CONTACT
2001290 A
Figure 1.
-3-
C15
C16
R20
R21
R22
R23
MASTER/SLAVE
R24
R25
R26
R27
IC3
R28
R29
R30
R31
R32
R33
CR8
V
C21
C22
O
R34
L
J7
CLASS II WIRING
+
-
TO SWITCH
JUMPER
BAL/UNBAL
JUMPER(2)
VOLUME
CONTROL
290A3076