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For saw-cut installations, observe the methods recommended in
Figure 7, above. The saw-cut must be to a depth of 1.5", clean and
with no sharp corners. After placing the wires, it is essential that the
wires be held tightly in place by a foam backing prior to pouring the
sealant. THIS IS ESPECIALLY IMPORTANT WHEN FREEZING
IS LIKELY. No voids should exist that will permit the collection of
water that might freeze and push the loop wires out of the slot. The
sealant used should not be hard setting and should be suitable for
pavement material.
THE WIRE USED FOR THE LOOPS MUST BE HEAT AND
WATER RESISTANT, CROSS-LINK POLYETHYLENE
INSULATED. TYPE XLPE IS BEST. RHW IS O.K. DO NOT
USE ANY PVC INSULATED WIRE. (PVC insulation will absorb
moisture that may affect Detector operation.) WIRE SIZE SHOULD
BE #16 GA. STRANDED OR LARGER.
VEHICLE DETECTOR LOOP BLANKING FOR
SWING GATES
The inside loop for a swing gate installation must be located at least
4 feet outside of the arc of the gate. If it is not, the Vehicle Detector
may detect the gate as it moves over the loop and cause the Gate to
reopen. If the gate is large and a single leaf, the arc usually requires
that the loop be a considerable distance from the closed gate position.
This may not be an effective position for the loop. In this case, a
“blanking” or “shadow” loop may be used.
WHEN A SHADOW LOOP IS NECESSARY, THE HDSWG 1000
MUST BE ORDERED WITH A SPECIAL DOUBLE POLE LIMIT
SWITCH FOR THE OPEN LIMIT SWITCH. The Vehicle Detector
relay control signal must be routed through the normally open
contacts of the second switch contacts of the Double Pole Open
Limit Switch. When the gate is in the fully open position, this
contact will close the circuit of the Vehicle Detector to the HDSWG
1000 and prevent the gate from closing when a vehicle is over the
Shadow Loop. When the gate is closing or opening, this contact of
the Limit Switch is open and the Vehicle Detector signal path is
broken.
ELECTRICAL POWER REQUIREMENTS
The HDSWG 1000 can be ordered for 115 Volts AC (VAC) or 230
VAC operation. Which voltage HDSWG 1000 to order depends
solely on the distance from the electrical service to the operator and
the wire size desired to be used. The AWG wire size for the
Figure 7: Loop Diagrams
104945
B:
PREPARING THE SITE