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EXTERNAL ENTRAPMENT PROTECTION
Consult a photoelectric sensor manual for wiring
details. Make all electrical connections to Smart
DC Controller as shown in Figure 77.
SENSOR 2
SENSOR 3
SENSOR 1
SENSOR COM
Terminal
Photo Eye +24
VDC
Figure 77. Entrapment Protection Only Connections
PHOTO EYE INSTALLATION TIPS
Underwriters Laboratories requires that any non-
contact sensor used as an external entrapment
protection device, must be tested to, and
recognized by, the UL 325 Standard.
z There are two common types of photoelectric
sensors, thru-beam and retro-reflective, and
each has its advantages.
• A thru-beam sensor is generally more
powerful and able to function reliably with dirty
optics and in poor weather.
• A retro-reflective sensor does not require
the installation and extra wiring of a separate
emitter and receiver as is required in a thru-
beam system, but retro-reflective eyes are
generally more problematic in poor weather.
Avoid using retro-reflective devices across
outdoor distances greater than 24 ft (7.3m)
because of performance and reliability issues.
120
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P ARTIAL
SENSOR 2
SENSOR 3
EXIT
LOOP
BLOCK
EXIT
IN OBS
LOOP
OUT OBS
LOOP
CENTER
LOOP
SENSOR 1
SENSOR
COM
+ 24 V
EMERG
OPEN
SHOW
LEDs
SWINGSMART DC PROGRAMMING AND OPERATIONS MANUAL
• For pedestrian detection, mount thru-beam
type photo eyes approximately 15" to 30" (4.6
to 9m) above the ground and as close to the
gate as possible. A minimum of one photo
eyes is required, but two is recommended,
one photo eye to guard the open direction
and the other for the close direction of travel,
unless gate edges for entrapment protection
are installed.
z Three wires to the receiver and two wires to the
emitter are all that is required.
• Depending on how the photo eyes are to be
wired, +24VDC or +12VDC, power is provided
via spades located just to the right of the COM
terminal strip near the left side of the board.
• The receiver and emitter common wires are
connected to the SENSOR COM terminal at
the bottom, left of the Smart DC Controller.
• The photo eye NO or NC output wires connect
to the Smart DC Controller at the Appropriate
Sensor Input (1, 2, or 3). The appropriate sensor
input must be programmed for Eye Open or
Eye Close based on whether it spans the road
or the "catch" area of an opening gate.
z If tripped while in motion, the standard function
is to stop the gate and automatically restart again
if the photo eye is clear within five seconds. An
optional setting in the Installer Menu will cause
a two second reversal of travel, or, if closing, can
be programmed to reverse to full open.
NOTICE
Sensor Common & +24V is the recommended
way to connect monitored photo eyes to Smart
DC Controller.
NOTICE
If photo eyes are to be used for vehicle
detection and logically function the same as
a vehicle detector, connect the common wires
to the COM terminals on the left side of the
board and wire the NO output contact to the
appropriate vehicle detector input: EXIT LOOP,
IN OBS LOOP, and OUT OBS LOOP.
REFERENCE
MX3640-01 REV. D ©2018
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