LiftMaster SL3000UL3 Owners Manual - Page 24

120VAC EXTERNAL LOOP DETECTOR WIRING PrOopuetsritdye GBA ® OmniControl Surge Suppressor P/N Q410 Patent Pending 123456 7 8 9 10 11 12 13 GBA M/S Link - + Center Loop Safety Loop Exit Fire Dept Strike Open Loop Key Switch Push Button Radio Receiver ProIpnesritdye See Accessories 120Vac "Safety" Loop Detector - Allows gate to stay open when vehicles are obstructing path. 3 CAUTION: Suggested for vehicles 14 feet or longer. If a vehicle is shorter, a center 4 loop system is recommended and should be installed. Safety Loop If the "Inside" and "Outside" safety loops are connected to the same loop detector: • They should be series connected to the detector • Have the same dimensions. • Have the same number of wire turns (See table below). 120Vac "Exit" Loop Detector - Allows gate to automatically open for exiting vehicles. 5 6 Exit Loop Installing Insulated Loop Wire Number of Wire Turns Needed for Loop Sizes Loop Perimeter Number of Wire Turns 10 feet to 13 feet 14 feet to 26 feet 27 feet to 80 feet 80 feet and up 4 3 2 1 The wire MUST be twisted together minimum 6 twists per foot from the end of the feeder slot to the loop detector. The wire is continuously wound in the loop saw cut for the required number of turns. One turn shown. (Refer to table) Saw Cut Remove sharp inside corners by making corner cuts Home Run 1/8" to 1/4" Width Saw Cut Feeder Slot Contact your local dealer for more information about loop detectors. Road Surface Sealant Backer Rod Min 1" Recommended Loop Wire XLPE 12-18 gauge (Use heavier wire gauge for a more durable loop). Insulated loop wire 3 turns shown, amount varies. Refer to table. 2" to 2.5" Depth Saw Cut 22 NOTE: Wire mesh or reinforcement embedded in the road surface should be cut away a minimum of 6 inches from the perimeter of the loop.