Installation and Maintenance Manual
31
Installing Photoelectric (Non-contact) Sensors
General Information:
Follow the guidelines in the Entrapment Protection Schematic to plan the most appropriate mounting
positions for the photo-eye sensors to be installed. If there are no other secondary external entrapment
protection sensors (typically an edge sensor), at least one photoelectric sensor is required to serve to
stop the gate if an obstruction is present.
There are two common types of photoelectric sensors, through beam and retro-reflective, each has some
advantages. A through beam sensor is generally more powerful and able to function reliably with dirty
optics and in poor weather. A retro-reflective sensor has the convenience of not requiring the installation
and electrical wiring of the remote emitter required in a through beam system, but is generally more
problematic in poor weather. Avoid use of a retro-reflective device to span a distance greater than 24
feet in an outdoor environment or performance will probably be unsatisfactory.
Compatibility:
A requirement of the UL 325 standard is that a photoelectric sensor be laboratory tested and
“recognized” under UL 325. In order to be compatible with a HySecurity operator, a photo eye must be
rated to function from 24 Volts DC source power.
Installation:
Mount the photo eye approximately 15” to 30” above the ground and as close to under the arm as
possible. Mount the receiver portion near the operator and below the arm and mount the emitter just
beyond the travel of the arm. The installation location described above is intended for pedestrian
detection, if photo eyes are also to be used for vehicular detection, consider, in addition to the low
elevation photo eye for cars, another photo eye at a height of about 55” to detect semi-trucks.
Configuration:
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 and provides the option
of a sinking or sourcing connection, choose the sinking connection.
Connection:
Three wires to the receiver and two wires to the emitter are all that is required.
a. The +24 Volt source power is obtained at one of the three spade terminals on the power supply board.
b. The –24 Volt source power is obtained from our terminals #14 or 15, labeled (Photo Eye Power) on
the Smart Touch Controller board.
Note: The –24 Volt Photo Eye Power also supplies the photo eye Common.
c. The photo eye NO or NC output connects to the Smart Touch Controller board at terminal #19.
Supervised Connection:
If the photo eye being installed has a true NC output (one that is NC when the photo eye is powered, aligned
and set for Light Operate) then a supervised connection is recommended. A supervised connection will signal
a system Fault and prevent gate operation if the photo eye connection ever becomes an open circuit or a
short circuit. The Installer Menu item [PC_0] must be changed to [PC_1] to enable this feature. See Installer
menu 13 on pages 22 and 24.
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