-15-
Operating Principle: •
When one talks, all intercoms will hear
.
•
To talk to other stations, press the talk/listen switch and
speak into the speaker/microphone. Release talk switch to
listen.
•
Pressing the call button on remote
A or B provides a
contact closure for an attention
‑getting auxiliary signaling
device, e.g. a strobe light.
NOTES: 1.
Speaker/Microphone
2.
Of
f/On/Speaker V
olume
Control
3.
Listen/T
alk Switch
4.
“Call” T
one
Switch
5.
Customer
‑Supplied
Auxiliary Signaling Device (e.g., strobe
light)
Power
Remote A
Remote B
12
‑18VDC
‑‑
AD
‑26
‑3
120V
50/60Hz
AD
‑28X
‑MV
AD
‑27
‑3
22
‑30VDC
AD
‑28X
‑MV
AD
‑56
‑3
240V
50/60Hz
AD
‑28X
‑MV
AD
‑57
‑3
POWER CONNECTIONS (Remote B): BLK
+DC Power
12/24V
Models
HOT
120/240V
Models
WHT
Common
12/24V
Models
Neutral
120/240V
Models
GRN
Earth Ground
120/240V
Models only
Reminders: •
Before installing remote intercoms, precautions should be taken to prevent feedback between two or more remotes in close proximity and acoustically reflective areas.
•
16–20 gauge low voltage audio cable.
Twisted pair not required.
•
Shielded audio cable not required unless operating in high electromagnetic fields. Ground one end of the shield to earth ground.
•
Audio and power cables are not supplied with
AD
‑28X
‑MV
.
•
The dry contacts can be used to switch an auxiliary audible or visual signaling device when the call button is depressed.
The maximum ratings for the dry contacts are 0.5 amps @ 125V
AC and 1.25 amps
@ 24VDC.
This method assures a call is received even when the volume on one of the intercoms is turned all the way down.
11
290A4725-1
1
10
9
8
7
6
5
4
3
2
1
DR
Y CONT
ACT
FOR CALL
AUDIO (-)
AUDIO (+)
REMOTE
GROUND (-)
24VDC (+)
NEUTRAL
HOT
EAR
TH GROUND
AC
1K
1W
ATT
REMOTE A
1
3
2
4
BLK
AUDIO CABLE
TO OTHER INTERCOMS
AUDIO LINE
AUDIO LINE
RED
WHT
-
POWER
+
POWER
GRN
REMOTE B
POWER
AUXILIAR
Y
SIGNALING DEVICE
5
SEE POWER CONNECTIONS
BLK WHT GRN
*
*
1
3
2
4
AUXILIAR
Y
SIGNALING DEVICE
5
ATKINSON DYNAMICS
UNIVERSITY
P
ARK, IL
USA
A FEDERAL
SIGNAL
COMP
ANY
ATKINSON DYNAMICS
UNIVERSITY
P
ARK, IL
USA
A FEDERAL
SIGNAL
COMP
ANY
Summary of Contents for AD-28X-MV
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