Reno AX2DL-XP User manual

MODEL AX2DL-XP
TWO CHANNEL LOOP DETECTOR with
DIRECTIONAL LOGIC AND TWO PRESENCE RELAYS
OPERATING INSTRUCTIONS
I General
The Model AX2DL-XP is a two channel inductive loop detector that monitors two independent inductive loops and
provides a separate presence relay output for each channel (1 and 2), AB directional logic relay output and BA
directional logic relay output. The loops connected to Channels 1 and 2 are scanned (alternating on and off
cycles), which eliminates crosstalk between loops connected to the same Model AX2DL-XP detector.
Please verify source voltage before applying power. The model designation indicates the input power required,
number of connectors, Fail-Safe / Fail-Secure configuration, and contact designation for the detector as follows.
Model AX2DL-XP-x-2C-x
Blank = Fail-Safe
S = Fail-Secure
2C = Two 11-pin connectors
3 = 120 VAC
4 =12 VDC / 24 VDC / 24 VAC
8 =240 VAC
The detector is factory configured for either Fail-Safe or Fail-Secure operation (see unit side label). The output
state of the either channel in Fail-Safe or Fail-Secure mode is listed in the table below.
Fail-Safe
Fail-Secure
Power Failure
Loop Failure
Power Failure
Loop Failure
Ch 1 / Ch 2 Output
No Call
Call
No Call
No Call
AB / BA Output
Call
Call
No Call
No Call
II Indicators and Controls
i 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
POWER LED
CH 1 / CH 2 DETECT LED
OFF
No power or low power
No vehicle present and Loop OK
ON
Normal power to detector
Vehicle present (Detect)
Flash
N/A
1 Hz rate, 50% duty cycle - Shorted Loop
10 Hz rate, 50% duty cycle - Open Loop
3 Flashes per second - Prior Loop Failure
(Loop has failed and the problem has been corrected.)
NOTE: If a vehicle is detected, the LED will turn
ON even if a prior loop failure condition exists.
NOTE: If the supply voltage drops below 75% of the nominal level, the power LED will turn off, providing a visual
indication of low supply voltage. Model AX2DL-XP detector will operate with supply voltage as low as 70% of
nominal supply voltage.
Reno A&E
4655 Aircenter Circle
Reno, NV 89502-5948 USA
Telephone: [phone]
Fax: [phone]
Website: www.renoae.com
E-mail: [e-mail]

2
ii Front Panel DIP Switches (Both Channels)
Switch
ON
OFF
Factory Default
1
Frequency
(See Table under Frequency Section)
OFF
2
OFF
3
Pulse Mode
Presence Mode
OFF
4
Sensitivity Boost
No Boost
OFF
5
Sensitivity
(See Table under Sensitivity Section)
ON
6
OFF
Frequency (DIP Switches 1 and 2)
Loops connected to channels 1 and 2 of a Model AX2DL-XP detector cannot crosstalk (i.e. interfere with each
other). In situations where loop geometry forces loops to be located in close proximity to one another and the
loops are connected to different detectors, it may be necessary to select different frequencies for each loop to avoid
loop interference. DIP switches 1 and 2 can be used to configure the detector to operate at one of four frequencies
corresponding to Low, Medium / Low, Medium / High, and High as shown in the table below.
NOTE: After changing any frequency switch setting(s), the detector must be reset by momentarily changing
one of the other switch positions or pressing the front panel RESET pushbutton.
Switch
Frequency
Low (0)
Medium / Low (1)
Medium / High (2)
High (3) *
1
ON
OFF
ON
OFF *
2
ON
ON
OFF
OFF *
* Factory default setting.
Presence / Pulse Mode (DIP Switch 3):
Each channel has two modes of operation, Presence or Pulse. When in Pulse mode (DIP switch 3 set to ON), a 250
millisecond pulse is output each time a vehicle enters the loop detection area. When in Presence mode (DIP switch
3 set to OFF), the channel’s output operates in True PresenceTM Mode and the detector channel will hold a Call
output as long as a vehicle is present and power is not removed or reset applied. True PresenceTM hold time applies
only for normal size automobiles and trucks and for normal size loops (approximately 12 ft2to 120 ft2). The
factory default setting is OFF (Presence Mode).
Sensitivity Boost (DIP Switch 4)
DIP switch 4 can be turned ON to increase sensitivity during the detect period without changing the sensitivity
during the no detect period. The boost feature has the effect of temporarily increasing the sensitivity setting by up
to two levels. When a vehicle enters the loop, the detector automatically boosts the sensitivity level. As soon as no
vehicle is detected, the detector immediately returns to the original sensitivity level. This feature is particularly
useful in preventing dropouts during the passage of high bed vehicles. The factory default setting is OFF (no
Sensitivity Boost).
Sensitivity (DIP Switches 5 and 6)
Each channel has four (4) sensitivity levels. DIP switches 5 and 6 select one of the four sensitivity levels available
as shown in the table below. Use the lowest sensitivity setting that will consistently detect the desired type(s) of
vehicle(s) that must be detected. Do not use a sensitivity level higher than necessary.
Switch
Sensitivity Level (-ΔL/L)
0.32% (0)
0.16% (1) *
0.08% (2)
0.02% (3)
5
OFF
ON *
OFF
ON
6
OFF
OFF *
ON
ON
* Factory default setting.
III Reset
Pushing the front panel mounted pushbutton labeled RESET or changing any DIP switch (except 1 or 2) will reset
the detector. After changing the frequency selection DIP switches, the detector must be reset.
IV Power Down Memory
When power is removed, the detector automatically remembers the status of the loop. During the loss of power,
vehicles may enter or leave the loop detection area. When power is restored, the detector will correctly determine
the current loop status and output a Call if a vehicle is in the loop detection area. If the loop detection area is
vacant, a Call will not be output. (A power loss power dip of any duration will not bring a gate arm down onto cars
as they wait at the gate). IMPORTANT: After installing and applying power to the Model AX2 detector,
momentarily push the RESET button to clear the Power Down Memory. This initializes the detector to the loops
that are connected and clears the memory of any previous loop information.
V Failed Loop Diagnostics
Each channel’s DETECT LED indicates whether or not the loop connected to the channel is currently within
tolerance. If the loop is out of tolerance, the LED indicates whether the loop is shorted (one Hz flash rate) or open
(10 Hz flash rate). If and when the loop returns to within tolerance, the DETECT LED will flash at a three flashes
per second rate to indicate that an intermittent loop fault has occurred and has been corrected. This flash rate will
continue until another loop fault occurs, the detector is reset, or power to the detector is interrupted. If a vehicle
enters the loop detection area while the DETECT LED is indicating an intermittent loop failure, the DETECT
LED will turn on to indicate the presence of the vehicle.

3
CH 1 LOOP
CH 2 LOOP
BA Direction
CH 1 LOOP
CH 2 LOOP
AB Direction
VI Pin Connections
Two Connector (2C) Models - Requires Two (2) Reno A & E Harnesses (Model 802-4)
Pin
Wire Color
Function (Connector 1)
Function (Connector 2)
1
Black
AC Line / DC +
No Connection
2
White
AC Neutral / DC Common
No Connection
3
Orange
Channel 1 Presence Relay, Normally Open (N.O.)
Channel 2 Presence Relay, Normally Open (N.O.)
4
Green
No Connection
No Connection
5
Yellow
BA Relay, Common
AB Relay, Common
6
Blue
BA Relay, Normally Open (N.O.)
AB Relay, Normally Open (N.O.)
7
Gray
Channel 1 Loop
Channel 2 Loop
8
Brown
Channel 1 Loop
Channel 2 Loop
9
Red
Channel 1 Presence Relay, Common
Channel 1 Presence Relay, Common
10
Violet, or
Black / White
BA Relay, Normally Closed (N.C.)
AB Relay, Normally Closed (N.C.)
11
White / Green or
Red / White
Channel 1 Presence Relay, Normally Closed (N.C.)
Channel 2 Presence Relay, Normally Closed (N.C.)
NOTE: All pin connections listed above are with power applied, loops connected, and no vehicle detected.
VII Warnings
Separately, for each loop, a twisted pair should be created consisting of only two (2) loop wires running the entire
distance from the loop to the detector (including runs through all wiring harnesses) at a minimum of six (6)
complete twists per foot. For trouble free operation, it is highly recommended that all connections (including
crimped connectors) be soldered.
VIII Directional Logic
The Model AX2DL’s directional logic feature uses the Channel 1 and Channel 2 loops to determine the direction a
vehicle is traveling. The loops must spaced such that the vehicle can span both loops. The expected installation is
two loops, one after the other in the same lane, spaced anywhere from overlapping to 6 feet apart. NOTE:
Contact a Field Engineer at Reno A & E regarding loop configurations and loop spacing for specific
applications.
When a vehicle enters the first channel’s loop detection area, that channel’s DETECT LED will flash at a rate of
750 milliseconds ON and 250 milliseconds OFF to indicate the presence of the vehicle. This flash rate will
continue until the vehicle is clear of the first channel’s loop detection area.
If the second channel’s output is set to Presence mode, its relay will activate and its DETECT LED will turn ON as
soon the vehicle enters the second channel’s loop detection area. The relay will remain activated and the DETECT
LED will remain ON until the vehicle is clear of the second channel’s loop detection area.
If the second channel’s output is set to Pulse mode, its relay will momentarily activate (i.e. generate a 250
millisecond pulse) and its DETECT LED will flash at a rate of 250 ms ON and 750 ms OFF to indicate the
vehicle’s presence over the second channel’s loop detection area. This flash rate will continue until the vehicle is
clear of the second channel’s loop detection area.
If the vehicle moves out of the first channel’s loop detection area before entering the second channel’s loop
detection area, directional logic detection is aborted and the second channel’s relay and DETECT LED will not
activate.
When a vehicle travels from the CH 1 Loop and
enters the CH 2 Loop, the CH 2 Relay and LED
activate to indicate the AB direction.
When a vehicle travels from the CH 2 Loop and
enters the CH 1 Loop, the CH 1 Relay and LED
activate to indicate the BA direction.

Model AX2DL_XP Op Instr Ver 2.1 2010 10 20 P/N 551-0126-00
4
IX Loop Installation
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 = 2/3 x 6
feet = 4 feet.
A =
6 ft
9 ft
12 ft
15 ft
18 ft
21 ft
C =
3 ft
4 ft
4.5 ft
5 ft
5.5 ft
6 ft
2. As the length of leg A is increased, distance C
must also increase.
3. For reliable detection of small motorcycles,
legs A and B should not exceed 6 feet.
Loop Installation - Saw Cut Type
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 placed 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.
A
B
C
A = Loop dimension parallel to the gate
B = Loop dimension perpendicular to the gate
C = Distance of the loop from the gate
SLIDE GATE
1
3
1/8" to 1/4" SAW SLOT
THE WIRE IS
CONTINUOUSLY WOUND
IN THE LOOP SAW SLOT
FOR THE REQUIRED
NUMBER OF TURNS (2
turns shown)
turn 2
turn 1
REMOVE SHARP
INSIDE CORNERS
FEEDER SLOT
END OF SAW CUT
4
THE WIRES MUST BE
TWISTED TOGETHER
6 TWISTS PER FOOT
FROM THE END OF
THE SAW CUT TO
THE DETECTOR
Recommended Loop Wire: Reno LW-120 for 1/8" slots
Reno LW-116-S for 1/4" slots
ROAD SURFACE
MIN
1"
SAW SLOT
SEALANT
BACKER ROD
1" piece spaced
about every 1'
LOOP WIRE
3 TURNS
2
6
5
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