HySecurity HTG 320-2, Руководство по установке и обслуживанию

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Installation and Maintenance Manual
32
Installing Photoelectric (Non-contact) Sensors (continued)
Photo Eye Function:
A tripped photo eye will prevent the gate from starting in either direction if the gate is stationary. If tripped
while in motion, the standard function is to pause the gate motion and then automatically restart again if the
photo eye is clear within five seconds. An optional setting in the Installer Menu will cause a 2 second
reversal of travel. See Installer menu item 12 on page 21.
Alignment:
Most photo eyes require careful optical alignment in order to aim the emitter beam to the center of the
receiver or reflector. In order to avoid false triggering, it is important to carefully align the system, especially
with retro-reflective photo eyes. The best way to assure true centering of the beam is with some trial testing
where the emitter is shifted to move the beam left and right and up and down until the range of the invisible
cone of the infrared beam is known. Photo eyes usually provide alignment aid LED’s for this setup, but they
can be hard to see. HySecurity has provided a unique feature that causes our buzzer to chirp when the photo
eye enters and exits alignment. See User menu 9. Set the Installer menu item [PE_0] to [PE_1] and the
buzzer will provide an audible indication both when the beam is broken and remade.
Notes about retro-reflective systems:
Correct installation and alignment of a retro-reflective photo eye and its reflector is important for a trouble free
installation. Any system operating at a range greater than 16 feet is more prone to false triggering due to dirty
optics, condensation or poor weather. If care is taken in the initial mounting and alignment of the 3-inch
reflector, the chance of problems is greatly reduced.
Taking steps to protect the photo eye and the reflector from being exposed to fog and being absolutely certain
the photo eye is perfectly aligned will greatly reduce any false triggering of the system. The ideal mounting of
a retro-reflective photo eye is inside and enclosure of some sort.
The ideal mounting for the reflector is suspended inside a twelve-inch long piece of 3-inch PVC conduit. Cut
the opening of the PVC conduit at a 45-degree angle to act as a drip shield. Hold the reflector against the
backside of the PVC conduit by attaching a 3-inch male connector. Do not cement the connector, so that the
reflector can be reached for future cleaning. To create a mounting base, attach a 3-inch aluminum flange
(electric meter hub) to the connector. This whole package can be mounted to any flat surface.
Locate the reflector in the center of the invisible beam of infrared light to achieve the most sensitive alignment.
The beam center is determined by the following test: while holding the reflector in your hand, slowly raise it
until the beam is no longer returned, and the photo eye trips. Mark this maximum height. Now lower your hand
and determine the lower limit of the infrared beam by watching for the trip point. Mark this position as well.
Repeat the same procedure for left and right at the center elevation of the beam, as determined by the
previous test. Once the four limits have been determined, either mount the reflector in the center of the area
outlined or realign the eye for the position of the reflector. If the photo eye is realigned, be sure to perform the
centering test again to verify that the reflector is truly in the center.
A last tip – if you coat the reflector with common dishwashing detergent, or some other anti-fogging
compound, it will reduce fogging from atmospheric moisture.