Vac External Loop Detector Wiring - Chamberlain SL3000UL8 Manual

WIRING

120 VAC EXTERNAL LOOP DETECTOR WIRING

120 Vac "Safety" Loop Detector - Allows gate to stay open when vehicles are
obstructing path.
CAUTION: Suggested for vehicles 14 feet or longer. If a vehicle is shorter, a center
loop system is recommended and should be installed.
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).
120 Vac "Exit" Loop Detector - Allows gate to automatically open for
exiting vehicles.
Installing Insulated Loop Wire
Number of Wire Turns Needed for Loop Sizes
Loop Perimeter
10 feet to 13 feet
14 feet to 26 feet
27 feet to 80 feet
80 feet and up
Contact your local dealer
for more information
about loop detectors.
Insulated loop wire
3 turns shown, amount varies.
Number of Wire Turns
The wire MUST be twisted together minimum 6
twists per foot from the end of the feeder slot to the
loop detector.
1/8" to 1/4" Width Saw Cut
Road Surface
Sealant
Backer Rod
Refer to table.
See Accessories
4
3
2
1
Home Run
Min 1"
2" to 2.5" Depth
Saw Cut
22
G B A
1 2 3 4 5 6
G G B B A A Center Center Safety Safety Exit Exit
Loop Loop Loop Loop Loop Loop
M/S Link M/S Link
3
4
Safety Loop
5
6
Exit Loop
The wire is continuously wound in
the loop saw cut for the required
number of turns. One turn shown.
(Refer to table)
Remove sharp inside corners
by making corner cuts
Feeder Slot
Recommended Loop Wire XLPE 12-18 gauge
(Use heavier wire gauge for a more durable loop).
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.
7 8 9 10 11 12 13
– – + +
Fire Dept Fire Dept Strike Open Strike Open Radio Radio
Key Switch Key Switch Push Button Push Button Receiver Receiver
Saw Cut