Aiphone DUAL MASTER CHIMECOM SYSTEM C-123LW Supplemental Instructions page 3

WIRING DIAGRAM: C-123L/A System with External Signaling using RY-AC Relay
C-D
1
E
NOTE:Negatives of
power supplies must
be tied together.
Normally Open Dry
Contact to door
strike and power
MODIFICATION INSTRUCTIONS:
C-ML/A with Door Release contact Modified to Normally Closed (for Magnetic Lock)
Magnetic locks require Normally
Closed contacts, keeping power
applied to the magnet to keep the
door locked, and breaking power to
release the door. These instructions
explain how to change the contact in
the C-ML/A to Normally Closed.
1. Remove back chassis of C-ML/A
and move PC-754 aside. Black
door release switch will be visible.
2. On the switch, move* the wire from
the NO contact (middle position) to
the NC contact (top position).
*Desoldering and resoldering is
required.
3. This modification will change the
door release button's function to
Normally Closed, to be used with a
magnetic lock device.
4. Switch contact rating is 1A at 50V
AC.
Component
*
Module
C-ML/A
1
E
SKK-620
+
+
-
-
L
L
12V DC
power supply
WHITE
RED
+
BLACK
-
Component Module*
If a DAK-2S is not available, install components as shown below.
Capacitor: 25V, 15-33mfd Non-polarized (Aiphone NP-25V)
Diode: 1N 4148
To 1 of C-D and
WHITE wire of RY-AC
C-ML/A Rear View with PC board removed.
Output of RY-AC (Yellow
wires) provide a momentary
dry contact closure while
the call button on the door
station is being pressed.
YELLOW
RY-AC
YELLOW
Power source
for bell
To 1 of C-ML/A
-
Door release
switch
NC
NO
COM
C-123LW Supplement
BELL
+
Pg. 3