HySecurity SlideSmart DC 15 Installation And Reference Manual page 108

Installing Photoelectric Sensors For Secondary Entrapment Protection Only
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 feet (7.3m)
because of performance and reliability issues.
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 two
photo eyes are required, 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. Mount the
emitters and the receivers just beyond the travel
of the gate in both the full open and full closed
positions of travel. The installation locations
described above are intended for pedestrian
detection. If photo eyes are to be used for
vehicular detection, install a low elevation photo
eye for cars and another photo eye at a height of
about 55" (140cm) to detect semi-trucks.
NOTE
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.
If the photo eye has an internal switch for setting Light Operate vs. Dark Operate, select Light Operate. If the
photo eye has a relay output and has both NO and NC terminals, some experimentation may be required to
determine the proper connection. This is because, in the Light Operate mode, the output relay is normally
energized and releases when the beam is blocked. Some manufacturers label an output as NO, when it is
actually an NC contact. If the photo eye has a solid-state output you must choose a sinking type connection.
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, +24VAC, +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 EYE COM terminal at the bottom, left
of the Smart DC Controller. (See NOTE.)
6-10 SlideSmart DC Installation and Reference Manual
EYE
Photo Eye Open
OPEN
Direction
EYE
Photo Eye Close
CLOSE
Direction
EXIT
LOOP
BLOCK
EXIT
IN OBS
LOOP
OUT OBS
LOOP
CENTER
LOOP
EDGE
Photo Eye COM
EYE
COM
terminal
+ 24 V
Photo Eye +24 VDC
EMERG
OPEN
Figure 6-9. Connections for Entrapment
Protection only
Note: EYE COM & +24V is the recommended way to
connect standard photo eyes to Smart DC Controller.
Other options include:
• Photo eye ON continuously: COM & +24VDC
or +24VAC (if the photo eye uses 24VAC).
• Photo eye ON continuously with anti-fog feature:
COM & +24VAC (connecting to DC will
negatively affect battery charging).
• Photo eye and peripherals draw more than 1A off
one power supply: Requires a separate power
supply connected to the service outlet.
SHOW
LEDs
Revision D