Optional Control Devices - Chamberlain LiftMaster Professional SW420 Manual

All inputs are normally open and momentary, except the stop (N.C.). The following instructions are based upon UL325, and include
recommendations for significant increase in safety.
We strongly recommend that you follow the UL guidelines presented throughout the manual. Refer to instructions shipped with optional control
devices for mounting, wiring, programming and adjustment.
24Vac Accessory Power-
Can be found at terminals R1 & R2 located on radio terminal block.
R1 R2
24 Vac
J1 Terminals 1 & 5 - Residential Radio (single button) Input
These terminals are intended for use with a radio receiver in a
residential application or as a single button control. This allows the user
to open the gate by activating the transmitter when the gate is closed
or between limits. This input also gives the user the ability to close the
gate by activating the transmitter when the gate is on the open limit.
J1 Terminals 2 & 5 - Shadow Loop Input
These terminals are intended for use with a loop detector and is
primarily used on swing gate operators. This input protects cars by
preventing the gate from moving off of the open or close limit when
the shadow loop input is active.
J1 Terminals 6 & 5 - Soft Open
These terminals are intended for use as a general open control.
Accessories that may be wired to this input include: Telephone Entry
Systems, Radio Receiver (Commercial Applications), Exit Loop
Detector, Keypads, 7-Day Timer.
Note: Will not override a double entrapment (signalled by the gate
stopped and entrapment alarm on).
Field Wiring Terminals 8 & 5 - Interrupt (Safety) Loop Input
These terminals are intended for use with a loop detector. This input
functions to reverse a closing gate to the open limit. Latching this input
will reset the timer to close.
O P T I O N A L C O N T R O L D E V I C E S
Field Wiring Terminal Blocks
5
R1 R2 R3 R4 3 5
J1 Terminal Block
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
R3 R4
8 9 10 11 12
GL Board
RESIDENTIAL RADIO (SINGLE BUTTON) INPUT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SHADOW LOOP INPUT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
3
2
1
6
5
9
8
7
#
0
INTERRUPT (SAFETY) LOOP INPUT
5 8
19
SW420
Operator
SOFT OPEN
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
9 10 11 12