Reno A&E AX Series Operating Instructions

VIII. L o o p I n s t a l l a t i o n :
The vehicle detection characteristics of an inductive loop detector are greatly influenced by the loop size
and proximity to moving metal objects such as gates. Vehicles such as small motorcycles and high bed
trucks can be reliably detected if the proper size loop is selected. If the loop is placed too close to a
moving metal gate, the detector may detect the gate. The diagram below is intended as a reference for
the dimensions that will influence the detection characteristics.
General Rules:
1. The detection height of a loop is 2/3 the shortest leg (A
or B) of the loop. Example: Short leg = 6 feet,
Detection Height = 4 feet.
2. As the length of leg A is increased, distance C must
also increase.
A = 6 ft 9 ft 12 ft 15 ft 18 ft
C = 3 ft 4 ft 4.5 ft 5 ft 5.5 ft
3. For reliable detection of small motorcycles, legs A and
B should not exceed 6 feet.
L o o p I n s t a l l a t i o n - S a w C u t T y p e
1 Mark the loop layout on the pavement. Remove sharp inside corners that can damage the loop wire insulation.
2 Set the saw to cut to a depth (typically 2" to 2.5") that ensures a minimum of 1" from the top of the wire to pavement
surface. The saw cut width should be larger than the wire diameter to avoid damage to the wire insulation when pla ced
in the saw slot. Cut the loop and feeder slots. Remove all debris from the saw slot with compressed air. Check that the
bottom of the slot is smooth.
3 It is highly recommended that a continuous length of wire be used to form the loop and feeder to the detector. Loop
wire is typically 14, 16, 18, or 20 AWG with cross-linked polyethylene insulation. Use a wood stick or roller to insert the
wire to the bottom of the saw slot (do not use sharp objects). Wrap the wire in the loop saw slot until the desired
number of turns is reached. Each turn of wire must lay flat on top of the previous turn.
4 The wire must be twisted together a minimum of 6 twists per foot from the end of the saw slot to the detector.
5 The wire must be held firmly in the slot with 1" pieces of backer rod every 1 to 2 feet. This prevents the wire from
floating when the loop sealant is applied.
6 Apply the sealant. The sealant selected should have good adhering properties with contraction and expansion
characteristics similar to those of the pavement material.
LOOP PERIMETER NUMBER OF TURNS
10 feet - 13 feet 5
14 feet - 26 feet 4
27 feet - 45 feet 3
46 feet - 100 feet 2
100 feet and up 1
1
1/8" to 1/4" SAW SLOT
3
THE WIRE IS
CONTINUOUSLY WOUND
IN THE LOOP SAW SLOT
FOR THE REQUIRED
NUMBER OF TURNS (2
turns shown)
turn 2
turn 1
FEEDER SLOT
Recommended Loop Wire: Reno LW-120 for 1/8" slots
Reno LW-116-S for 1/4" slots
Model AX Operating Instructions 03-30-04 (551-0106-01) (2).doc
SLIDE GATE
A
A = Loop dimension parallel to the gate
21 ft
B = Loop dimension perpendicular to the gate
6 ft
C = Distance of the loop from the gate
ROAD SURFACE
6
SEALANT
5 BACKER ROD
1" piece
spaced about
every 1'
REMOVE SHARP
INSIDE CORNERS
LOOP WIRE
3 TURNS
THE WIRES MUST BE
TWISTED TOGETHER
6 TWISTS PER FOOT
FROM THE END OF
THE SAW CUT TO
THE DETECTOR
4
END OF SAW CUT
4
Reno A & E P/N 551-0106-01
Engineering Excellence! Engineering Excellence!
O P E R A T I N G
C
SINGLE CHANNEL LOOP DETECTOR
B
I. General:
Please verify source voltage before applying power. The model designation indicates the input power
required, output configuration, and Fail-Safe / Fail-Secure configuration for the detector as follows.
Model AX-x-x
The detector is factory configured for either Fail-Safe or Fail-Secure operation (see unit side label). The
output state of the output relay in either Fail-Safe or Fail-Secure mode is listed in the table below.
Output State
II. Indicators and Controls:
i. Power / Detect / Fail LEDs:
The detector has one green and two red LED indicators that are used to provide an indication
of the detector's power status, output state, and/or loop failure conditions. The table below lists the
various indications and their meanings.
Status
SAW SLOT
2 Off
On
Flash
MIN
Note: If the supply voltage drops below 75% of the nominal level, the POWER LED will turn off, providing a
1"
visual indication of low supply voltage. Model AX detectors will operate with supply voltage as low as 70% of
nominal supply voltage.
ii. Front Panel DIP Switches:
Switch
1
2
3
4
5
6
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I N S T R U C T I O N S
Model AX Series
Blank = Fail-Safe, S = Fail-Secure
3 = 120 VAC
4 = 12 VDC / 24 VDC / 24 VAC
8 = 240 VAC
Fail-Safe
Power Failure Loop Failure
Call Call
POWER LED DETECT LED
No power or low power Output Off
Normal power to detector Output On
4 Hz - Two second timing
N/A
delay activated
ON
Frequency
(See Table under Frequency Section)
Pulse Mode Presence Mode
Sensitivity Boost
Sensitivity
(See Table under Sensitivity Section)
F O R
Fail-Secure
Power Failure Loop Failure
No Call No Call
LOOP FAIL LED
Loop OK
Open Loop
1 Hz - Shorted Loop
3 Hz - Prior Loop Failure
OFF Factory Default
OFF
OFF
OFF
No Boost OFF
ON
OFF