Chamberlain LiftMaster Professional SW420 Manual page 24

P R O G R A M M I N G S E T T I N G S ( D I P S W I T C H # 2 ) c o n t i n u e d
EDGE/PHOTO OPEN
This switch (S2-3) selects edge or photo sensor for the gate opening
protection input.
Open Photo Eye (Pause): When the controller is configured for photo
eyes, the input functions to pause the gate during the opening cycle.
Once the input is cleared the gate continues to open.
Open Edge: When the controller is configured for safety edges, the
input functions to reverse the gate to the close limit when the edge is
activated during the opening cycle.
EDGE OPEN
S2
ON
ON
1 2 3 4
P R O G R A M M I N G S E T T I N G S ( D I P S W I T C H # 4 )
DUAL GATE COMMUNICATIONS
The controller is capable of running the operator in a master or second
mode depending on (S4) switch setting.
Before initiating any command the master unit queries for the presence
of a "second unit" for a time period of one second. If the master gets no
response the operator will operate in a stand alone mode.
NOTE: For single unit applications, a jumper must be placed between
11 and 12. In this mode no further communications will take place
during travel. If the master detects the presence of a second unit the
master will continue to query the second unit during travel. The second
unit will send a response to the master for every query. The second
operator will stop if there is a period of one second or more of no
communications.
When two operators are connected in dual gate configuration
accessories may be connected to either the master or second.
NOTE: Do not run Master/Second communication wiring in the
same conduit as the power and control wiring.
NOTE: The Second unit will require a normally close stop circuit for
proper system operation.
NOTE: After Master/Second wiring has been completed and the S4
switch programmed, both units must have their power cycled to
initiate proper Master/Second communication.
NOTE: The motor learn function must be completed in stand alone
mode prior to Master/Second wiring.
PHOTO OPEN
S2
ON
ON
1 2 3 4
EDGE/PHOTO CLOSE
This switch (S2-4) selects edge or photo sensor for the gate closing
protection input.
Close Photo Eye (Reverse): When the controller is configured for
photo eyes, the input functions to reverse the gate to the open limit
when activated during the close cycle.
NOTE: Timer to close will reset if enabled.
Close Edge: When the controller is configured for safety edges, the
input functions to reverse the gate to the open limit when activated
during the close cycle. The entrapment is not cleared at the limit and
the timer to close will be disabled. The timer to close may be enabled
by activating the interrupt loop, soft open or hard open input.
EDGE CLOSE
S2
ON
ON
1 2 3 4
MASTER OR STAND ALONE
GATE SETTING
MASTER
UNIT
ON
S4
SECOND
UNIT
Figure 1
Field Wiring
Terminal
12 11
Shielded cable (twisted pair)
minimum 18 gauge
STREET
Second
24
PHOTO CLOSE
S2
ON
ON
1 2 3 4
SECOND GATE
SETTING
MASTER
UNIT
ON
S4
SECOND
UNIT
Field Wiring
Terminal
11 12
Conduit
Master
(Gate Conduit)
See Figure 1
COMPLEX
OR
PARKING LOT