Aiphone LDF-20C User Manual
Special
Order
Products
LDF
LDF Loudspeaker Master Station with External Control Capability
LDF-20C LDF-40C
LDF-20CA LDF-40CA
- LDF SUPPLEMENT TO LAF-C/CA INSTRUCTIONS -
The LDF Loudspeaker Intercom and External Control System is designed for communication between a central master
station and remote intercom stations. The LDF is an expanded feature version of the LAF-C/CA system. All
information regarding installation other than the external control functions is included in the LAF-C/CA instructions. In
addition to communication to remote locations, external devices can be activated, such as activating a CCTV camera
when the associated sub station is selected, selectively controlling the corresponding door strike or maglock, or both.
WIRING DIAGRAM: SYSTEM USED FOR CCTV CAMERA CALL-UP
LDF-20CA
1
2
LS-NVP
Red
LS-NVP
Red
3
~
20
E
Blk
Grn
Blk
Grn
-
External
Terminal Block
1
2
3
~
PS-1225UL
+
-
Individual Components for System:
LDF-nC Master station with selective contact output capability (20, 40)
LDF-nCA Master station w/handset and selective contact output capability (20, 40)
LD-20AS 20-call Add-on Selector with selective output capability
LD-40AS 40-call Add-on Selector with selective output capability
RY-PA Relay for selective output (1 per station requiring external contact)
PS-1225UL 12V DC, 2.5A Power Supply
LE-series Any model sub station with LE-prefix
LS-NVP Vandal proof sub station (add SBX-NVP for surface mount)
IMPORTANT:
1. RY-PA must be used for each additional contact to
isolate AC voltage from the intercom circuit.
2. Extra contact connections and L are on separate
terminal block. LDF-40C/CA has two terminal blocks.
20 L
+
-
BLK
RY-PA
#1
BLK
Constant Closure for Station #1
YEL
RY-PA
#2
YEL
BLK
RY-PA
#3
Equipment for each station that requires
both a constant closure and momentary
closure when a channel is selected:
2 RY-PA relays
2 Diodes (1N4001)
Constant Closure for Station #2
YEL
LE-DA
1
E
-
Constant Closure for Station #3
Terminal Block
1
L
2
LDF Master
+
NOTE:
Leave jumper between E & - on master
and subs when using 2 conductor
homerun wiring IN SINGLE MASTER
SYSTEM ONLY. Jumper BLK/GRN
wires at LS-NVP in 2-wire system.
CONSTANT CLOSURE:
Normally Open contacts remain closed as
long as master has sub station selected.
DUAL FUNCTIONS FROM EACH CHANNEL:
BLK
RY-PA
#1
RY-PA
#2
BLK
BLK
YEL
YEL
RY-PA
#1
RY-PA
#2
BLK
-
LDF TERMINAL DEFINITIONS:
+ Positive 12V DC input, and constant closure output
- Negative
1~40 Station number
E Common communication
R Occupied LED control
L Positive output for selective closure
(Located on terminal block)
Momentary closure #1
Constant closure #1
Momentary
YEL
closure #2
Constant
YEL
closure #2
Pg. 1
WIRING DIAGRAM: SYSTEM USED FOR SELECTIVE DOOR RELEASE
LDF-20C
1
2
3
LE-D
1
LE-D
1
LE-D
1
~
20
E
E
-
E
-
E
-
-
Normally Open
contacts are
maintained when the
door release button
is being pressed
while a station
button is selected.
To activate
door release,
press button
located above
TALK button.
PS-1225UL
+
-
+
-
1
2
3
~
20 L
External
Terminal Block
BLK
RY-PA
#1
YEL
BLK
RY-PA
YEL
#2
RY-PA
BLK
To convert RY-PA to N/C
(normally closed) contact:
Move one yellow wire
from "NO" to "NC".
(Internal modification,
soldering required.)
#3
Momentary Closure for Station #1
Momentary Closure for Station #2
Momentary Closure for Station #3
YEL
Common for each closure
x x
AC Power
for Door
Releases
OPERATION:
* POWER SWITCH MUST BE ON FOR SYSTEM TO BE OPERABLE.
1. When a station calls in, press the selector button corresponding to the lit LED.
2. To speak to the person at the remote station, press the TALK button (or pick up the handset). Release TALK
button to hear reply. Communication via the handset is VOX (voice actuated).
3. If the extra contacts are used as shown in the "camera call-up" diagram, activating a device that is to remain
on for the duration of the call, the station's relay will stay activated as long as the selector button is depressed.
4. If the extra contacts are used as shown in the "selective door release" diagram, press the "door release" button
while the selector button is depressed. This will activate the corresponding relay as long as the button is
being held, which will activate the door release mechanism.
5. If both functions are used on a channel, the device connected to the "constant closure" relay will be on for the
duration of the call. The "momentary closure" will only be active when the door release button is pressed.
6. When the conversation is completed, press the OFF button to the left of the station selector button.
Hang up handset.
SPECIFICATIONS
Power Source: 12V DC at master. Use PS-1225UL.
For additional information about this system,
please refer to the LAF-C/CA instructions.
Commun. Output: 800mW at 20 ohms
Communication: Push-to-talk, release-to-listen (TALK button) or VOX handset at master.
Hands free at sub station.
Calling: Master to sub: By voice only
Sub to master: Call button on sub activates tone and LED at master.
LED remains lit for 20 seconds, and tone is momentary.
Wiring: 2 conductors homerun to sub station (single-master system only),
or loop multi-conductor with 2 common + 1 individual wire per sub station on wire run.
Separate 2 conductor from RY-PA to external device.
Shielded cable is recommended.
Use Aiphone #822202 (2 cond., 22AWG) or #822203 (3 cond., 22AWG) wire.
Wiring Distance: 650' with 22AWG; 1,600' with 18AWG.
Aiphone Communication Systems
1700 130th Ave. N.E.
Bellevue, WA 98005
(425) 455-0510
FAX (425) 455-0071
TOLL FREE TECHNICAL SUPPORT:
(800) 692-0200
TOLL FREE FAX LINE:
(800) 832-3765
E-MAIL: tech-serv@aiphone.com
Pg. 2
LDF Instr.
1103BKJS
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