Controlled Products Systems Group 222X383 - Manual (Page 43)

Installation and Maintenance Manual
35
D0119, Rev. F
Installing Photoelectric Sensors
continued
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 either the open or close 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 18 on page 26.
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 14 & 15 on pages 25 & 26.
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 turns power on to the photo eyes and causes our buzzer to
chirp when the photo eye enters and exits alignment. See User Menu item 9 on page 24 to enable this feature.
Set the menu item [PE_0] to [PE_1] and the buzzer will chirp twice when the beam is broken and once when
remade. (The parameter will automatically reset the next time the Close Limit Switch is triggered.)
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 an enclosure.
The ideal mounting for the reflector is for it to be 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.
This would prevent the reflector from being 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.