Loop Info-Q-2-16
12
Every swing loop installation is unique and may have specific
problems that are not fully explained in this manual. DoorKing
highly recommends that the loop system is installed by a
professional installer who understands loop systems
and can foresee any problems that might occur for
your specific installation. Swing gates
typically use two reverse loops that are
installed outside the swing path of
the gate. This is necessary to avoid
the loops detecting the gate swinging
over them. This would be detected by the
loops and cause the gate to reverse.
However, this leaves a large unprotected
area.
To eliminate the unprotected area, a “shadow” loop is
installed under the swing path of the gate. The control circuit in the
gate
operator will only accept inputs from the shadow loop detector when the
gate is in the full open position.
Once the gate begins its closing cycle, the gate
operator ignores any input from the shadow loop detector, thereby allowing the gate to
pass over the shadow loop without reversing itself.
The reverse loops and shadow loop require a two-channel loop detector.
The optional automatic exit loop requires a separate single loop detector.
Swing Gates
Unprotected
Un
pr
ot
ec
te
d
Area
Ar
ea
Swing Path
of Gate
Swing Path
of Gate
Reverse Loop
Reverse Loop
Shadow Loop
•
Minimum loop size is 18 in. x 48 in. (Pages 3 and 4)
DoorKing preformed loops are 4 ft x 8 ft. (Page 10)
•
Loop should stay inside swing path of gate.
•
Loop should line up with open gate position.
•
Loop should to be far enough away from the reverse loops to
avoid any “cross-talk” or on a different loop detector frequency
if detection fields overlap. (Page 7)
Reverse Loop
Optional
Automatic
Exit Loop
Reverse Loop
Shadow
Loop
Loop Lead-In Wire
Primary Operator
Secondary Operator
Loop Lead-In Wires
Loop Lead-In Cable
Underground Loop Wire
Closed Gate
Position
Open Gate
Position
Primar
y
Op
erator
Secondar
y
Operator
Reverse Loops
•
Minimum loop size is 18 in. x 48 in. (Pages 3 and 4) DoorKing preformed loops are 4 ft x 8 ft. (Page 10)
•
Loops must be the same size, same number of turns and same distance away from the gate. (Page 6)
•
Loops must be wired in series. (Page 6)
•
Loops must be far enough away from gate to avoid gate movement interference. (Page 7)
•
Loops should to be far enough away from the shadow loop and/or exit loop to avoid any “cross-talk”
or on a different loop detector frequency if detection fields overlap. (Page 7)
Automatic Exit Loop
•
Install a separate loop detector.
•
Minimum loop size is 18 in. x 48 in. (Pages 3 and 4)
DoorKing preformed loops are 4 ft x 8 ft. (Page 10)
•
Normally located 20-100 feet away from the gate so that the gate is
open or opening as you drive up to it. Typically a loop lead-in cable
will need to be installed. (Pages 2 and 6)
•
Loop should to be far enough away from the reverse loop and/or
shadow loop to avoid any “cross-talk” or on a different loop detector
frequency if detection fields overlap. (Page 7)
Loop Lead-Ins
•
Wire loop lead-in should be twisted 6 turns per foot. (Pages 2 and 6)
•
Use wire loop lead-ins up to 100 ft. away from operator. (Page 3)
•
Use cable loop lead-in farther than 10 ft. away from operator if required. (Pages 2 and 6)
•
All wire connections must be soldered between underground loop wire and loop lead-ins. (Page 6)
•
Series wired loop lead-ins should each be run to the operator before
connecting them together for easy maintenance. (Page 6)
Summary of Contents for 9409 Dual Channel
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