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WIRING DIAGRAM: LEM-1DL System with External Signaling using RY-AC Relay
C-D
1
E
NOTE: Negative 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 Modifi ed 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 the PC-754 board 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 modifi cation will change the
door release button's function to
Normally Closed, to be used with
magnetic lock device.
4. Switch contact rating is 1A at 50V
AC.
Component
C-ML/A
Module*
1
E
SKK-620B
+
-
L
L
To 1 of C-D and
WHITE wire of RY-AC
IMPORTANT: Connect wires
before applying power.
12V DC power
supply
White
Red
+
RY-AC
Black
-
Component Module*
If a DAK-2S is not available, install components as shown below.
Capacitor: 25V, 15-33ufd Non-polarized
Diode: 1N4148
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.
Power source
for bell
To 1 of C-ML/A
-
+
Door release
switch
NC
NO
COM
C-123LW Supplement
BELL
Pg. 3
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