Loop Info-Q-2-16
6
Phasing loops refers to the
direction that the electrical current flows through the loops
, and not necessarily the physical
direction that the loop wire has been wound. For example, if two loops are installed and physically wound in a Clockwise
direction, you can reverse the electrical current through one of the loops by simply reversing the connection where the loops
are wired together. Doing this effectively changes the “electrical” direction that the loops are wound.
Electrically Reverse the Phase of a Loop
Loop 1
physically wound clockwise
Loop 2
physically wound clockwise
9410
Terminal
Reverse the loop 2
wires to reverse the
“electrical” direction
(Phase) of loop 2.
Loop 2 will then
function in a counter-
clockwise “electrical”
direction.
Note: If slide gate reverses direction during cycling without an obstruction
present (vehicle on loop), loop sensitivity fields might be attracted to each
other and sensing the gate’s movement. Electrically reversing one loop would
change the field of sensitivity allowing a “Dead Zone” for gate movement.
It was mentioned previously that when two loops are wired to the same detector terminal, they must be the same size, same
number of turns and the same distance from the gate. They must be connected in series and the direction in which each loop is
wound is important for proper door or gate operation. It is also advisable to have the loop connections accessible for mainte-
nance and repair. Route each of the loop lead-in wires all the way to the loop detector
before wiring the loops together in series for easier access to the loop connections in
future maintenance, rather than connecting them together in a water tight junction box
in the ground and running a single lead-in cable to the loop detector.
Loop Phasing
Loop lead-in wires
running to loop detector.
(Must be twisted a minimum of six turns per foot)
9410
2 loops
wired in
series at
the loop
detector.
If using shielded twisted pair loop lead-in cable, ground shield at operator end ONLY.
Slide Gate
Terminal
PVC Conduit
Loop 1
Wound Clockwise
Loop 2
Wound Clockwise
PVC Conduit
PVC Conduit
6
9
3
12
6
9
3
12
Operator Chassis Ground
Insulated (Floated) Shield
Loop Lead-In Cable
Watertight J-Box
Wire from Loop
Tape to keep
wires together
Tape to keep
wires together
Grounded
Shield
Connected to
Loop Detector
Shielded twisted pair with a high-density polyethylene insulation.
All spliced connections must be soldered.
Do not use wire nuts or crimp connectors.
Soldered Connection
Summary of Contents for 9409 Dual Channel
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