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SIGNAL FLOW AND THEORY OF OPERATION FOR
PK543 AMPLIFIER AND APARTMENT INTERCOM SYSTEM
The following example describes an Apartment Intercom
System using a PK543 Amplifier and is based on a 4-Wire
Intercom Station.
Call Button
Pressing an apartment
CALL
the call tone from the PK543 Amplifier's terminal ZW
(or Z), through the apartment button being depressed, to
the Tone In (X) terminal on the apartment intercom station
being signaled. This tone passes through the intercom
station's speaker and returns on Common (1). The tone is
heard at the intercom station—and if dipswitch 3 is in
the ON position—at the entry panel. (Applies to warble
tone only.)
Talk Button
Pressing the
button at an apartment intercom station
TALK
connects audio from the intercom station's speaker through
the intercom station's terminals 1 and 2, to the PK543
Amplifier's terminals 1 and 2. This audio is amplified and
output on the amplifier's terminals A and G. The amplified
audio is then routed to entrance panel's speaker/
microphone. The result is that someone speaking at the
apartment intercom station is heard at the entrance panel.
In 3-wire apartment intercom stations, audio to and from
the intercom station is between terminals 1 and 5.
Listen Button
Pressing the
button at an apartment intercom station
LISTEN
connects the speaker of the intercom station to terminals
1 and 3 of the PK543 Amplifier, which outputs amplified
audio from the entrance panel speaker. The entrance panel
speaker remains connected to the PK543 amplifier
terminals A and G, and acts as a microphone in this mode.
In 3-wire apartment intercom stations, audio to and from
the intercom station is between terminals 1 and 5.
Figure 1—Wiring Layout Diagram
To additional
suites
Add risers
as required
Door
Release
Entrance
Panel
2 cond.#18
button on the entry panel routes
Suite Station wiring:
3-wire stations: 1 twisted pr #22,
plus 1 cond. 22 gauge per suite
4-wire stations: 1 twisted pr #22
and 1 cond. #22 common, plus 1
cond. 22 gauge per suite. (LED
stations: add an additional 2 #22
conductor to the commons.)
5-wire stations: 2 twisted pr plus 1
cond.#22 per suite
Transformer
117 VAC
Door Button
Pressing the
button at an apartment intercom station
DOOR
applies a closure across the intercom station's terminals 2
and 3. The closure is routed to the PK543 Amplifier's
terminals 2 and 3. The amplifier senses the closure and
provides 16 VAC across the amplifier's terminals D and
K. At the same time, DC voltage is also present across
terminals L+ and L- as the unfiltered output of a full-
wave rectifier fed by the same 16 VAC.This voltage is
applied to the door release to unlock the entrance door.
There are two possible variations of this scheme. First, a
closure across PK543 Amplifier's terminals 1 and E can
be used to output 16 VAC across the amplifier's terminals
D and K. Second, pressing the
apartment intercom station produces a closure across
the intercom station's terminals 1 and E (terminal 4).
Door Ajar Indication
This feature is available with the IR104C/LED and
IR204C/LED suite stations. When the door is open and
the door contact is in the closed state, the
LED will illuminate to indicate the door is ajar.
Post Office Lock
Actuating the post office lock applies closure across the
PK543 Amplifier's terminals 1 and E (terminal 4). The
PK543 Amplifier senses the closure, and outputs 16 VAC
across the amplifier's terminals D and K. At the same
time, DC voltage is also present across terminals L+ and
L- as the unfiltered output of a full-wave rectifier fed by
the same 16 VAC. This voltage is applied to the door
release to unlock the entrance door.
Figure 2—Optional Connection for
24 VAC Door Release
24 VAC
Door
8
Release
24
SS106 Transformer
Note:
Terminal L- is not the same electrically as terminals 1,
G and K.
IL487 Tek-ENTRY
button at a 5-wire
DOOR
button's
DOOR
L -
#18
L +
D
K
16
C
PK543
®
with PK543 • Page 3
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