Controlled Products Systems Group HTG 320-2 ST - Manual (Page 42)

StrongArm Installation and Reference 32
Placement and Use of Secondary Pedestrian Entrapment Sensors
WARNING:
To reduce the risk of serious injury or death, read and follow all instructions in the
gate operator handbook and on the warning labels.
Automatic gate operators are intended only for vehicular use and pedestrians must be routed to a
separate man gate, however sensors are still required in order to provide a degree of protection should
anyone happen to stray into the area of an automatic gate. Generally there are two types of external
sensors that may be used: Contact type sensors, such as an edge sensor, and non-contact sensors,
such as photoelectric eyes. Except for an exclusion provided for barrier arm gates not moving within two
feet of a rigid object, current standards require the use of either type or both of these sensors.
The specifier or installer may choose either photoelectric eyes or edge sensors, or use these devices in
combination. The UL 325 standard for automatic gates specifically states the following:
One or more non-contact sensors (photoelectric eyes) shall be located where the risk of
entrapment or obstruction exists, such as the perimeter reachable by a moving gate.
A hardwired contact sensor shall be located and it’s wiring arranged so that the communication
between the sensor and the gate is not subjected to mechanical damage.
A contact sensor that transmits its signal to the gate operator shall be located such that the signal
is not impeded by building structures or other obstructions and shall function under its intended
end-use conditions.
The contact and non- contact sensors must be tested and labeled as ―Recognized Components‖
under the UL 325 standard in order to be deemed acceptable for use in this application.
Study the protection device schematic and consider your specific installation to determine where
the greatest risks of entrapment exist. Locate edge sensors and/or the photoelectric sensors
accordingly.
Installing Gate Edge (Contact Type) Reversing Sensor
1. Drill holes through the edge’s mounting channel and through the bottom surface of the arm. If the
arm is aluminum or fiberglass you can use pop rivets to install, on arms of wood use wood screws
to securely fasten the edge sensor track. Slide the edge sensors into the track. The track itself
may be supplied in multiple sections. Add as needed for your arm length.
2. Pull edge sensor leads through a hole provided in the chassis and directly connect them to the
Smart Touch Control Board.
a. Mount the gate edge so that all possible contact areas of the arm are covered.
b. Always route the leads of the edge sensors to the gate operator so that they are protected
from physical damage and given enough slack that the arm can move its full travel without
stressing the leads.
c. Connect one edge sensor lead to our Common Buss on the power supply board and the
other to terminal #13, which is labeled Edge Sensor input.
Test the operation of the reversing edge to make sure that it functions correctly. Advise the
user of the gate to be certain to retest this vital function weekly.