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Model L-ATG
Loop Detector
Firmware Version 1.01
Operations Manual
Single Cha nnel Anti-Tailgating Inductive Loop Vehicle Detector
Built-in Loop Analyzer
This manual contains technical information for the
Model L-ATG Loop Detector
pn 889-1207-00 Revision: April 2 020
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THE FOLLOWING PRODUCT WAS DESIGNED, INSPECTED, TESTED AND
MANUFACTURED IN THE USA BY EBERLE DESIGN, INC. IN PHOENIX, ARIZONA.
INFORMATION CONTAINED HEREIN IS PROPR IETARY TECHNICAL INFORMATION OF
EBERLE DESIGN, INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE OR PART IS
NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING. ALL
REGISTERED TRADEMARKS OF EBERLE DESIGN INC. ARE UNDER
MAINTENANCE NOTE
IT IS AN EBERLE DESIGN, INC. RECOMMENDATION THAT EACH UNIT BE TESTED
AT LEAST ANNUALLY TO ENSURE COMPLIANCE WITH FACTO RY
SPECIFICATIONS AND MEETS PROPER OPERATIONAL STANDARDS. THE
RESULTS OF THIS TESTING WILL BE DOCU M EN T ED .
© COPYRIGHT
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Model L-ATG Operations Manual
Table of Contents
Section 1 General Description ......................................................................................... 1
Section 2 General Characteristics ................................................................................... 3
2.1 Loop Frequency ..................................................................................................... 3
2.2 Sensitivity Level ..................................................................................................... 3
2.3 Call Delay Time ...................................................................................................... 3
2.4 Call Extension Time ............................................................................................... 3
2.5 Max Presence Time ............................................................................................... 3
2.6 Option 1: Display Loop Inductance (l) and % Loop Inductance Change (-∆L/L) ...... 3
2.7 Option 2: Display Vehicle Count ............................................................................. 4
2.8 Option 3: Relay B Buzzer ....................................................................................... 4
2.9 Option 4: Training Mode ......................................................................................... 4
2.10 Option 5: Relay B Output Mode ............................................................................ 4
2.11 Option 6: Control Input Active High / Low ............................................................. 4
Section 3 Specifications .................................................................................................. 5
3.1 Physical.................................................................................................................. 5
3.2 Electrical ................................................................................................................ 5
3.3 Operational ............................................................................................................ 5
3.4 Table: Sensitivity, -∆L/L, and Response Time......................................................... 6
3.5 Table: Default Settings ........................................................................................... 6
3.6 Table: Pin Assignments .......................................................................................... 6
Section 4 User Interface ................................................................................................... 7
Section 5 Installation and Set-Up .................................................................................... 8
5.1 Program Mode Display Screen ............................................................................... 8
5.2 Normal Mode Display Screen ................................................................................11
5.3 Option 4: Training Mode ........................................................................................13
5.4 Option 5: Relay B Output Mode .............................................................................13
5.5 Option 6: Control Input Active High / Low ..............................................................15
5.6 Loop Faill Indications .............................................................................................15
5.7 Setting Sensitivity Using the Bargraph ...................................................................16
5.8 Setting Sensitivity for Motorcycle Detection Using the Bargraph ............................17
5.9 Full Restore to Factory Default Settings ................................................................17
5.10 Display Test ........................................................................................................17
Section 6 Block Diagram .................................................................................................18
Section 7 Theory of Operation ........................................................................................19
Section 8 Maintenance and Troubleshooting ................................................................20
8.1 Troubleshooting Power Problems ..........................................................................20
8.2 Troubleshooting Initialization Problems .................................................................20
8.3 Troubleshooting Loop Fail Problems .....................................................................21
8.4 Troubleshooting Intermittent Loop Fail Problems ...................................................22
8.5 Troubleshooting Intermittent Detector Lock Ups ....................................................22
8.6 Things to Know About Loops .................................................................................23
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Section 1 General Description
This Operation Manual was written for people installing, operating, and maintainin g Reno A&E Model L-ATG
Series inductive loop vehicle detectors. The Model L-ATG is a single channel, shelf mount type, inductive loop
vehicle detector designed to provide accura te passe nger vehicle co unts and/or ide ntific ation of ta ilgating passenge r
vehicles passing over small inductive loops used in revenue control and controlled access applications. Typical
loop size is 2.5 feet by 6 feet with three (3) , fo ur (4 ), or five (5) turns. Please note that t he Model L-ATG has been
specifically designed and tested to co unt and/or identify passenger vehicles, not commercial vehicles or vehicles
towing trailers.
Accurate vehicle counts are important in revenue control and controlled access applications. Standard
inductive loop vehicle detectors provide a single count for each vehicle detection. If the vehicles being
counted are closely spaced and multiple vehicles pass over a loop in a manner that the detector is
continuously in detection, the detector will only count one vehicle. In another scenario, a metal object
can be placed in the area defined by the detection loop to cause a continuous detect output. Multiple
vehic les ca n then pass over the detection area and not be co unted. The Model L-ATG will accurate ly
count vehicles spaced as closely as bumper to bumper. Metal objects placed in the area of the loop are
ignored as well.
The Model L-ATG accumulates vehicle counts and can be configured to display the accumulated count
on a front panel Liqu id Crystal Display (LCD). The Model L -ATG features two ( 2) rela y outputs. Relay
A, the presence output, is used for vehicle presence detection. Relay B, the secondary output, can be
used to provide a vehicle count indication to an external device or provide an indicati on that a tailgating
incident or ve hicle entry has oc curred.
Following installation of the Model L-ATG detector, a simple one-time calibration is required.
Calibration takes into account possible environmental effects on the loop, such as reinforcing stee l in the
pavement, metallic objects permanently lo cated in close proximity to the loop, number of turns in the
loop, etc.
The Model L-ATG incorporates a microcontroller that monitors a nd processes signals from the loop /
lead-in circuit. The microcontrolle r uses these inputs to dete rmine how to control th e detector outputs.
A Liquid Crystal Display (LCD), a light emitting diode (LED), and three front pane l pushbuttons are
used to display and program all detector functions. Several diagnostic modes are available to aid
technicians and service personnel in troubleshooting detection problems.
The use of a LCD is what distinguishes this de tector from that of other manufacturers. It allows more informat ion,
never before available, to be displa yed to t he use r during normal operation of the detector. T he LCD makes it easy
to view and adjust all progra mmable detector options and settings. It is no longer necessary to check or change
detector settings with DIP sw itches. An eight-segment bargraph at the top of the L CD can be used to provide a
graphical representation of the relative change of inductance as seen by the det ec t o r a t t he c ur r e nt s e nsitivit y le vel.
The bargraph automatically takes into account loop size, loop inductance, number of turns, loop geometry, lead-in
length, etc. The bargraph functions as a sliding scale that relates to the programmed Sensitiv ity Le vel. The f irst
(left-most) bargraph segment represents the minimum inductance change necessary for the detector to output a call
at the currently selected sensitivity level. Larger inductance changes will indicate more segments. Each additional
segment indicates that the next sensitivity level has also been met or exceeded. When used in this manner, the
bargraph provides an indication of whether the sens itivity is set too high o r too low, f acilitating t he ideal setting o f
the se nsitivity level.
All programmed settings are stored in non-volatile memory and can only be changed by programming new
settings. Loss of power or a de tector reset will not change any of t he programmed settings. If a loop failure
occurs, the LCD will display the type of loop failure as L lo (for -25% change or shorted loop conditions) or L hi
(for +25% change or open loop c onditions). Each loop failure is counte d and accumulated in the Loop Failure
Memory. The number of loop failures since the last detector reset or power i nter r upt i on is ver y us e ful in fo r mat io n
to have available during analysis of intermittent loop operation.
When operating in the Program Mode, the Mode l L-AT G displa ys t he r e a l t i me l oo p f re q uency rea d i ng. T he e i ght
frequency settings can be incremented or decremented to provide precise frequency readings, removing any
guesswork when changing frequency settings to e li minate crosstalk. NOTE: Adjacent loops connected to different
channe ls of a non-sc anning detector or different scanning detectors should be set to diffe rent frequencies with
maximum sepa r ation.
The Re no A& E M o d e l L-A TG utilizes the first major innovat ion in inductive loop detectors s ince the introductio n
of digital detectors. The pr ogramming of all of the detector’s parameters with three nor mally open pushbutton
switches not only simplifies s etup by re moving bina ry coded DIP s witches, b ut also increas es the re liability o f the
detector by eliminating the dependence on switch contacts during normal operation. The detailed descriptions
displayed on the LCD eliminate the interpretation of numerous LED flash rates to determine the detector status. In
addition, the Model L-ATG offers the versatility of software control. Special functions are possible with a simple
change of the socket-mounted microprocessor. Special functions are de fined as unique options (e.g. Option 4,
Option 6, etc.). Special option functions are activated through the use of the LCD menu option progra mming.
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The Model L-ATG Series is comprised of the following detectors:
Model L-ATG-1 For applications calling for a single channel, 120 volt AC, shelf mount
detector with the capability to detect and identify tailgating vehicles.
Model L-ATG-5 For applications calling for a single channel, low volta ge (12 or 24 volt
DC or 24 volt AC), shelf mount detec tor w ith t he capab ilit y to detect a nd
identify tailgating vehicles.
Model L-ATG-35 For applications calling for a single c hannel, 240 volt AC, shelf mount
detector with the capability to detect and identify tailgating vehicles.
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Section 2 General Characteristics
2.1 LOOP FREQUENCY
There are eight (8) selectable loop frequency settings (normally in the range of 20 to 100 kilohertz). The actual
loop operating frequency is a function of the loop / lead -in network and the components of the loop oscillator
circuit. The digital display of the actual loop operating frequency for each setting makes it easy to quickly identify
and eliminate crosstalk in the most difficult to configure intersections. The frequency display is typically very
stable when the loop is vacant and vehicles are not passing nearby the lo ops. If the read ing is va rying by more tha n
±1 in th e last digit, t his is an indication of possible cross talk between loops.
2.2 SENSITIVITY LEVEL
There are nine (9) selectable sensitivity levels, plus Conti nuo us-Call and Channel-Off. T he se nsit ivit y leve ls a re
designed so that a one level increase actually doubles the sensitivity and a one level decrease halves the sensitivity.
A unique bargraph displayed on the LCD makes it easy to quickly set sensitivity at the ideal level for any loop /
lead-in network configuration. (See Section 3.4 for actual detection levels at each sensitivity level.)
C
ONTINUOUS-CALL: When set to the Co ntinuous-Call state, the detector’s output is continuo usly in the Call
state regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when in the
Continuous-Call state. T his state is indicated b y CALL flashing on the LCD. This option is selected from the
Sensitivity me nu i n Pr o g ram Mode and is useful when troubleshooting equipment related prob lems.
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HANNEL-OFF: When set to the Channel-Off state, the detector’s outp ut is continuously in t he No Call state
regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when in the
Channel-Off State. This sta te is indicated by OFF flashing on the LCD. This option is selected from the
Sensitivity menu in Program Mode and is useful when troubleshooting equip me nt related prob lems.
2.3 CALL DELAY TIME
The Model L-ATG has two (2 ) output relays. Call De la y T ime a pplies to Relay A only and can be adjusted from 0
to 255 seconds in one-second steps . C all Delay time starts counting down when a vehicle enters the loop de tec t ion
zone. The remaining C all Delay time is conti nuously displa yed on the LCD.
2.4 CALL EXTENSION TIME
The Model L-ATG has two (2) output relays. Call Delay Time applies to Rela y A only and can be adjusted from 0
to 25.5 seconds in 0.1-second steps . Extension time starts counting dow n when the last vehicle clears the loop
detect ion z one. The re main ing Ca ll Ext ens ion ti me is c ont inuo usly d ispla yed o n the LCD. A ny ve hicle ente rin g
the loop detection zone during the Call Extension time period causes the detector to return to the Detect state, and
later, when the last vehicle clears the loop detection zone, the full Call Extension time starts counting down again.
2.5 MAX PRESENCE TIME
When Max Presence Time is set to OFF, True P rese nceTM mode is selected and the detector will prov ide a Call
output as long as a vehicle is present in the loop detection zone. TruePresence
passenger vehicles and for normal size loops (approximately 10 ft
Presence timer is adjustable from 1 to 999 seconds in one-second steps. The Max Presence function is used to
limit presence time by automatically resetting the detector. If this function is enabled (ON), the Max Presence
timer begins counting down when a call is initiated and the remaining ti me is c on t inu ous ly d is p la yed o n the LC D.
If the loop becomes vacant before the Max Presence timer reaches zero, the call is dropped and no automatic reset
occurs. When the Max Presence timer reaches zero, the detector is automatically reset.
2
to 120 ft2). When activated, the detector’s Max
TM
time applies only for no rmal s ize
2.6 OPTION 1: DISPLAY LOOP INDUCTANCE (L) AND % LOOP INDUCTANCE
CHANGE (-∆L/L)
Pressing either the (UP) or (DOWN) pushbutton toggles Option 1 between ON and OFF. When Optio n 1 is
OFF, the LCD displays three dashed lines (- - -) du ring a No Call state o r CALL and t he Ca ll stre ngt h (via t he
LCD bargraph display) during a Call state.
When Op tio n 1 is ON and t he detector is operating in normal display mode, the LCD c ontinuously displays the
Loop Inductance value (L) in microhenries (μH) between 15 and 2500 μH. By recording t he inducta nce of the
loop / lead-in c ircuit when it is first insta lled, the actua l inductance ca n be compared t o the expected inducta nce to
help identify defective loop / lead-in circuits. Loop / lead-in inductance can be easily estimated using the simp le
formulas included in Section 8.7 of this manual. When a vehicle is detected, the Call is indicated by means of the
DETECT LED and the LCD bargraph display. While in the Call state, the LCD also displays the percentage of
inductance change (-∆L/L value) while a vehicle is detected. The maximum -ΔL/L that has occurred is displayed
for two seconds unless a greater change occurs. The count do wn o f the De lay, E xtens ion, a nd/or Max P resenc e
timers is not d isplaye d when O ption 1 is ON. Once set to ON, Option 1 will turn OFF after 15 minutes have
elapsed.
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2.7 OPTION 2: DISPLAY VEHICLE COUNT
This option has two parameters. Option 2.0 is used to turn the display of vehicle counts on the fro nt panel mounted
LCD ON and OFF. Option 2.1 is used to reset the vehicle count to zero.
The detector is capable of accumulating 99,999 vehicle counts be fore ro lling o ver to ze ro. W hen Option 2.0 is ON,
the normal display will show the accumulated vehicle count since the vehicle count was last reset. Setting Option
2.1 to ON resets the accumulated vehicle count. The setting of Option 2.1 automatically reverts to the OFF state
when the parameter is exited. NOTE: Loss of power or resetting the detector will not reset the vehicle count.
2.8 OPTION 3: RELAY B BUZZER
When Option 3 is ON, an audible signa l is emitted a ny time Relay B outputs a count, tailgating, or e ntry signal.
Option 3 will automatically retur n to the OFF state 15 minutes after being set to ON.
2.9 OPTION 4: TRAINING MODE
When Opt ion 4 is ON, the detector is placed in the training mode. This feature is used in conjunction with the
Reno A&E Calibration Loop (not included with the detector) to ensure that the detector will accurately detect
tailgating vehicles.
2.10 OPTION 5: RELAY B OUTPUT MODE
Option 5 is used to control the o utput mode of Relay B. Option 5 has seven (7) settings, 5.0 through 5.6. A setting
of 5.0 is generally used in applications where the primary concern accurate counting of passenger vehicle entries.
Option 5 settings 5.1 through 5.6 are used in applications where the primary concern is detection of events that are
considered to be exceptions to normal entra nce occurrences (i.e. tailgating or multiple passenger vehicle entr y
occurrences).
When Option 5 is set to 5.0, the detector’s count total is incremented by one and Relay B provides a 0. 25 second
pulse count output for each passenger vehicle that passes over the loop.
Option 5 settings 5.1 through 5.3 are use d in applications where the primary concern is detection of ta ilgating
events. A tailgating incident occurs when two pass enger vehic les are o ve r t he loop at the same time. When Option
5 is set to 5.1, 5.2, or 5.3 the detector’s count total is incremented by one and Relay B provides a pulse output only
when a tailgating inc ident has been detect ed. The duratio n of the pulse o utput varies depend ing on the setting o f
the option. When set to 5.1, the pulse duration is 0.25 se cond. Whe n set to 5.2, t he pulse d uration is one second.
When set to 5.3, the pulse duration is five seconds.
Option 5 settings 5.4 through 5.6 are used in applications where the primary concern is detection of multiple
passenger vehicle entry events. Option 5 settings 5.4, 5. 5, and 5.6 function in conjunction with Option 6 (see
Option 6 - Control Input Active High / Low below). In a normal entrance scenario, one passenger vehicle enters
the controlled area for each cycle of the control input. (In general, the control input is active when the gate is open
and inactive when the gate is closed.) There are two different output schemes that can occur. The first occurs
when Option 5 is set to 5.4, 5.5, or 5.6 a nd the state of the control input is active (i.e. the gate is open). The
detector’s count total is incre mented by one and Relay B provides a pulse output for ea ch passenger vehicle that
crosses the loop after the first passenger vehicle has crossed the loop. Ve hicle counts continue to be accu mulated
until the state of the c ontrol inp ut changes (i.e. the gate close s). If the state of the c ontrol input is not active (i.e.
the gate is closed), Option 5 settings 5.4, 5.5, and 5.6 result in a slightly different output scheme. The detector’s
count total is incremented by one and Relay B provides a pulse outp ut for every passenger vehicle that crosses the
loop. When set to Option 5.4 O N, the pulse duration is 0.25 second. Whe n set to Option 5.5 ON, the pulse
duration is one second. When set to Option 5.6 ON, the pulse duration is five seconds.
2.11 OPTION 6: CONTROL INPUT ACTIVE HIGH / LOW
When Option 6 is OFF, t he co ntro l input is active when it is in a high state. When Option 6 is ON, the co ntro l
input is active when it is not in a high state.
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Section 3 Specifications
3.1 PHYSICAL
WEIGHT: 24 oz. (680.4 gm).
S
IZE: 4.70 inches (11.94 cm) high x 2.50 inches (6.35 cm) wide x 5.90 inches (14.99 c m) deep (excluding
connector). Connector adds .675 inch (1.71 cm) to depth measurement.
O
PERATING TEMPERATURE: -40° F to +180° F (-40° C to +82° C).
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IRCUIT BOARD: Printed circuit boards are 0.062 inch thick FR4 material with 2 oz. copper on both sides and
plated through holes. Circuit board and components are conformal coated with polyur ethane.
C
ONNECTOR: MS3102A-18-1P. See Section 3.6 for pin assignments.
3.2 ELECTRICAL
POWER: 89 to 135 VAC, 50/60 Hz, 6 W atts maximum (L-ATG-1). 180 to 270 V AC, 50/60 Hz, 6 Watts maximum
(L-ATG-35). 10 to 30 VAC, 50/60 Hz, 6 Watts maximum / 10 to 30 VDC, 160 mA maximum (L-ATG-5).
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ONTROL INPUT VOLTAGE: 89 to 135 VAC, 50/60 Hz, 6 Watts maximu m (120 volt AC models). 180 to 270 VAC,
50/60 Hz, 6 Watts maximum (240 volt AC models). 10 to 30 VAC, 50/60 Hz, 6 Watts maximum / 10 to 30 VDC ,
160 mA maximum (low voltage models).
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OOP INDUCTANCE RANGE: 20 to 2500 microhe nries with a Q factor of 5 or greater.
L
OOP INPUTS: Transformer isolated. The minimum capacitance added is 0.068 microfarad.
L
IGHTNING PROTECTION: Meets and/or exceeds all applicable NEMA TS 1-1989 specifications for transient
voltage protection.
R
ESET: When operat ing in Nor mal Mode, the detector ca n be reset b y pressing a nd hold ing the FUNC pushbutton
for three seconds. The detector can also be reset by removing a nd reapplying power, or by changing either the
sensitivity or loop frequency sett ing. The vehicle c ount ca n only be reset b y sett ing Option 2. 1 to ON. A de tector
reset, changing the sensitivity or loop frequency, or loss of power will not reset the vehicle count.
R
ELAY RATING: The relay contacts are rated for 6 Amps maximum, 150 VDC maximum, and 180 Watts maxi mum
switched power.
3.3 OPERATIONAL
DISPLAY: The LCD backlighting illuminates whenever any pushbutton is pressed. The backlighting will
extinguish 15 minutes after the last pushbutton press.
D
ETECT INDICATOR: The detector has a s uper bright, h igh intensity, red light emitting d iode (LED) to indicate a
Call Output, Delay Timing, Extension Ti ming, or Failed Loop condition.
R
ESPONSE TIME: (See Section 3.4 for actual response times.)
S
ELF-TUNING: The detector automatically tunes and is operational within two seconds after application of power
or after being reset. Full sensitivity and hold time require 30 seconds of operation.
E
NVIRONMENTAL & TRACKING: The detector is fully self-compensating for e nvironmental changes a nd loop drift
over t he full te mperatur e range and the e ntire loo p inductance ra nge.
G
ROUNDED LOOP OPERATION: The loop isolation transformer allows operation with poor q ualit y loops (w hic h may
include one short to ground at a single point).
L
OOP SIZE: The detector has bee n designe d and tested to ope rate most effectively w hen connec ted to a s ingle loop
that measures 2.5 feet (0.76 m) x 6 feet (1.83 m) (nominal dimensions). Connection to multiple loops is not
recommended. The loop size can vary from 2 feet (0.61 m) to 3 feet (0.91 m) in the direction of travel and 5 feet
(1.52 m) to 7 feet (2.13 m) across the lane. The loop should have three (3), four (4), or five (5) turns of wire.
L
OOP FEEDER LENGTH: Up to 5000 feet ( 1500 m) maximum with proper feede r cable and an appropriate loop.
NOTE: The detector has been designed and tested to operate most effectively when connected to a single loop that
measures 2.5 feet x 6 feet. If the length of the loop feeder cable exceeds 200 feet (58 m), it may be necessary to
increase the number of turns in the loop to ensure accurate vehicle counting.
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Sensitivity
-ΔL/L
Response Time
OFF
-------
-------
1
2.56%
96 ±16 ms
2
1.28%
96 ±16 ms
3
0.64%
96 ±16 ms
4
0.32%
96 ±16 ms
5
0.16%
96 ±16 ms
6
0.08%
96 ±16 ms
7
0.04%
96 ±16 ms
8
0.02%
96 ±16 ms
9
0.01%
96 ±16 ms
CALL
-------
-------
Function
Setting
Loop Fr equency
2
Sensitivity L evel
5
Call Delay Time
0
Call Extension T ime
0.0
Max Presence Time
OFF
Option 1 - Display Loop Inductance (L) and % Loop Inductance Change (-∆L/L)
OFF
Option 2.0 - Display Vehicle Count
OFF
Option 2.1 - Reset Vehicle Count
OFF
Option 3 - Relay B Buzzer
OFF
Option 4 Training Mode
OFF
Option 5 - Relay B Output Mode
5.0
Option 6 - Control Input Active High / Low
OFF
Pin
Wire Color
Function
A
White
AC Neutral / DC Common
B
Brown
Relay A, Normally Open (N.O.)
C
Black
AC Line / DC + D Red
Loop
E
Orange
Loop
F
Yellow
Relay A, C ommon G Blue
Control Input
H
Green
Chassis Ground
I
Violet
Relay B, Common J Gray
Relay B, Normally Open (N.O.)
NOTE: All pin connections listed above are with powe r applied, loop connected, and no vehicle detected.
LOOP (FAIL) MONITOR: If t he total inductance of the detector’s loop input netwo rk goes o ut of the range spec ified
for the detector, or rapidly changes by more than ±25%, the detector will immediately enter the Fail-Safe mode and
display LOOP FAIL on t he LCD. The type of loop failure will also be displayed as L lo (for -25 % change or
shorted loop conditions) or L hi (for +25% change or open loop conditions). This will continue as long as t he loop
fault exists. At the ti me of a loop failure, the LED will begin to flash at a rate o f three flashes per second. The
LED will continue this display pattern until the detector is manually reset or power is re moved. If the loop selfheals, the LOO P FAIL message on the LCD will extinguish and the detecto r will resume operation in a normal
manner; except the LED will continue the three flashes per second dis play pattern, thus providing an alert that a
prior Loop Fail condition has occurred. Each loop failure for the detector is counted and accumulated into the
Loop Fail Memory. The total number of loop failures written into the Loop Fail Memory (since the last power
interruption or manual reset) is viewed by stepping through the functions in Program Mode until the LOOP FAIL
message is displayed.
3.4 TABLE: SENSITIVITY, -∆L/L, AND RESPONSE TIME
3.5 TABLE: DEFAULT SETTINGS
3.6 TABLE: PIN ASSIGNMENTS
(Reno A&E Wiring Harness Model 801-4)
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MODEL L-ATG
ANTI-TAILGATING
DETECT
FUNC
-∆L/L =
FREQ KHZ
LOOP FAIL
OPTION
MAX PRESENCE
OFF
EOG
SCANNING
EXTENSION
SENSITIVITY
DELAY
PULSE
SECONDS
ON
1 4 2
3
Seven Segment Display
Parameter Description
DETECT LED
UP Pushbutton
Bargraph
Numbered Loop Symbols
DOWN Pushbutton
FUNCTION SELECT PUSHBUTTON
Section 4 User Interface
• Vehicle Signal Strength
• Frequency Setting
• Parameter Values
• Timer Countdown
• Frequency Reading
• Inductance Value
• -∆L/L Value
• Type of Loop Failure
• L hi = Open Loop or L High
• L lo = Shorted Loop or L Low
• Vehicle Count
• Name of Parameter
• Timer in Operation
• Channel Displayed
• Flashing = Program Mode
VEHICLE DETECTOR
• Call
• Delay Time in Progress
• Extension Time in Progress
• Loop Fault has Occurred
• Press Momentarily to Enter Program
Mode and to Step Through
Parameters
• Exit Program Mode
Press and Hold for One
Second
• RESET Channel
Press and Hold for Three
Seconds
• Increments Values
• Toggles ON and OFF
• Decrements Values
• Toggles ON and OFF
NOTE: There are no internal switches or jumpers to set.
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FREQ KHZ
1
©
©
DELAY
SECONDS
1
SENSITIVITY
1
©
Section 5 Installation and Set-Up
Prior to initial operation, the Model L-ATG detector must be ca librated. Connect the detector to an appropriate ly
wired harness and apply power. Follow t he instructions outlined in Section 5.3 to calibrate the detector.
The detector has no DIP switches or jumpers to configure. If the detector is not new from the factory, it may be
advantageous to reset the detector back to the factory defaults to avoid having to check every setting. To reset the
detector to factory default, press and hold all t hree pus hb utton sw itches s imulta neo usly for five se conds. W hen all
three p us hb ut to ns a re dep re s se d, the d is p lay w i ll s ta rt c o unt in g d ow n f ro m f ive (5 ). Whe n the co unt d ow n re ac hes
zero (0), releas ing the pushbuttons will reload the factory defaults and reset the detector. Once reset, the detector
must be recalibrated as outlined in Section 5.3. NOTE: Resett ing the detector back to factory de faults will not
reset the vehicle count.
All operating parameters can be adjusted from the front panel. The detector continues to operate normally while it
is in t he Program Mode. The value cur r ently displaye d is always the actual value being used . Example: If you are
changing the delay time, the time displa yed at the instant that a vehicle entered the detection zone would be the
value used for t he delay timer.
Pressing the FUNC pus hbutton e nters t he Prog ram Mode . The FUNC p ushbutto n has an auto re peat funct ion.
This allows quick navigation to the desired para meter. The FUNC pushbutton only moves forward through all of
the parameters. There is no way to move backwards through the parameters.
Pressing and holding either the (UP) or (DOW N) pushbutton w i ll c a us e t he value t o c hange rapidly u nt il t he
pushbutton is released.
Pressing and holding the FUNC pushb utt on for one s ec ond w ill ex it t he P ro gram Mo de a nd re tu rn t o the No rma l
Mode.
5.1 PROGRAM MODE DISPLAY SCREEN
PARAMETER ...................Loop Frequency.
S
ETTINGS ........................Eight (8) Selections - 1 to 8.
S
ETTING DISPLAYED ......Bargraph indicates settings from 1 (left) to 8 (rig ht).
7
SEGMENT DISPLAY ......Actual Frequency of the loop circuit. Typically 20.0 to 99.9
D
EFAULT SETTING..........2.
E
XAMPLE ........................Frequency sett ing 4 is selected. The loop frequency is 34.9
N
OTES .............................Changing the frequency will reset the detector. An unstable
P
ARAMETER ...................Sensiti vity Level.
S
ETTINGS ........................11 Selections - 1 to 9, OFF, or CALL.
S
ETTING DISPLAYED ......7-segment display will show the currently selected settin g.
7
SEGMENT DISPLAY ......Currently selected Sensitivity Level.
D
EFAULT SETTING..........5.
E
XAMPLE ........................Sensitivity Level 6 is selected.
N
OTES .............................Changing the sensitivit y will reset the detecto r. If the detector
P
ARAMETER ...................Call Delay Time .
S
ETTINGS ........................256 Selections - 0 to 255 Seconds in one-second steps.
S
ETTING DISPLAYED ......7-segment display will show the currently selected settin g.
7
SEGMENT DISPLAY ......Currently selected Delay time in seconds.
D
EFAULT SETTING..........0 seconds.
E
XAMPLE ........................Delay of 10 seconds selected
N
OTES .............................If the detection zone is occupied when this parameter is
kilohertz.
kHz.
frequency display varying more than ±0.2 kilohertz may
indicate loop crosstalk or other interference.
is in the call state when viewing this parameter, the bargraph
will show the strength of vehicle calls so that the correct
sensitivity can be verified from this screen.
changed, the change will not take effect until the detection zone
is empty or the detector is reset.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 8 of 23
Page 15
EXTENSION
SECONDS
1
©
MAX PRESENCE
SECONDS
1
©
OPTION
1
ON
©
OPTION
1
ON © OPTION
OFF
1
©
OPTION
1
ON
©
PARAMETER ...................Call Extension T ime.
S
ETTINGS ........................256 Selections - 0 to 25.5 Seconds in 0.1-second steps.
S
ETTING DISPLAYED ......7-segment display will show the currently selected settin g.
7
SEGMENT DISPLAY ......Currently selected Extension time in seconds.
D
EFAULT SETTING..........0 seconds.
E
XAMPLE ........................Extension of 2.5 seconds selected.
N
OTES .............................If the detection zone is occupied when this parameter is
P
ARAMETER ...................Max Presence Time.
S
ETTINGS ........................1000 Selections - 1 second to 999 seconds or OFF.
S
ETTING DISPLAYED ......7-segment display will show currently se lec te d s e tting.
7
SEGMENT DISPLAY ......Currently selected Max Presence time in seconds.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Max Presence is turned OFF.
N
OTES .............................If the detection zone is occupied when this parameter is
P
ARAMETER ...................Option 1 (Display Loop / Lead-In Ind uctance, L and % Loop
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 1 is turned ON.
N
OTES .............................This option will automatically turn off 15 minutes after being
P
ARAMETER ...................Option 2 .0 (Display Vehicle Count).
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 2.0 is turned OFF.
N
OTES .............................When t his option 2.0 is ON, the Normal Mode display will
P
ARAMETER ...................Option 2.1 (Reset Vehicle Count).
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 2.1 is turned ON.
N
OTES .............................Setting Optio n 2.1 to ON resets the accumulated vehicle count.
PARAMETER ...................Option 3 ( Relay B Buzzer) .
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 3 is turned ON.
N
OTES .............................When O ption 3 is ON, an au dible si gnal is emi tted any t ime
changed, the change will take effect while the detection zone is
occupied.
changed, the change will not take effect until the detection zone
is empt y or t he detector is reset. When Max Presence is turned
OFF, the detector operates in True Presence
TM
mode.
Induct ance Change, -∆L/L).
activated or on loss of power.
show the accumulated vehicle count since the vehicle count was
last reset. The display will show the hundreds, tens, and ones
digits until the accumulated count exceeds 999. At this point
the display will alternate between the ten thousands and
thousands digits and the remaining t hree digits for hundreds,
tens, and ones. The unit is capable of accumulating 99,999
vehicle counts before rolling over to zero.
The setting of Optio n 2.1 a utomatic a lly rev erts to the O FF state
when the parameter is exited.
Relay B outputs a count, tailgating, o r entry s ignal. This option
will automatically tur n off 15 minutes after being act ivated or
on loss of power.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 9 of 23
Page 16
OPTION
OFF
1
©
LOOP FAIL
1
©
OPTION
1
ON © OPTION
1
ON
©
© 1 ©
PARAMETER ...................Option 4 (Training Mode).
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 4 is turned OFF.
N
OTES .............................Refer to Section 5.3 for a complete explanation of this option.
P
ARAMETER ...................Option 5 ( Relay B Output M ode).
S
ETTINGS ........................Seven selections: 5.0 to 5.6.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7-
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........5.0.
E
XAMPLE ........................Option 5.0 is turned ON.
N
OTES .............................Refer to Section 5.4 for a complete explanation of this option.
P
ARAMETER ...................Option 6 (Control Input A ctive High / Low).
S
ETTINGS ........................ON or OFF.
S
ETTING DISPLAYED ......The word ON or OFF will be displayed.
7
SEGMENT DISPLAY ......The number of this option.
D
EFAULT SETTING..........OFF.
E
XAMPLE ........................Option 6 is turned ON.
N
OTES .............................When Option 6 is ON, the control input is active when it is not
P
ARAMETER ...................Loop Fail.
S
ETTINGS ........................Pressing the (U P) or (DOWN) pushbutto n will clear the
S
ETTING DISPLAYED ......View only.
7
SEGMENT DISPLAY ......Loop Failures since the last time it was cle ared manually or due
D
EFAULT SETTING..........0.
E
XAMPLE ........................There are eight (8) Loop Failures in the accumulator.
N
OTES .............................Count will be reset to zero after loss of power, by pressing the
P
ARAMETER .............................Firmwar e Vers ion and Revision.
S
ETTINGS ..................................View Only.
S
ETTING DISPLAYED ................View Only.
7
SEGMENT DISPLAY ................Model letter and fir mware version on
D
EFAULT SETTING....................Not Applicable.
E
XAMPLE ..................................Model L-ATG firmware version 1,
in a state. When Option 6 is OFF, the contro l input is active
when it is in a high state.
Loop Fail memory.
to power failure.
(UP) or (DOWN) pushbutto n, or by resetting the detector.
one screen and firmware revision on
the other screen.
revision .01.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 10 of 23
Page 17
1
©
PRESENCE
PRESENCE
1
©
PRESENCE
DELAY
SECONDS
1
©
PRESENCE
EXTENSION
SECONDS
1
©
MAX PRESENCE
SECONDS
1
©
5.2 NORMAL MODE DISPLAY SCREEN
STATE...........................Idle.
B
ARGRAPH DISPLAY ....OFF.
7
SEGMENT DISPLAY ....Three Dashes.
T
EXT ............................PRESENCE indicating detection mode of the detector.
D
ETECT LED ...............OFF.
D
ETECTOR OUTPUTS ...OFF.
E
XAMPLE .....................The detector is idle and in the presence mode of detection.
N
OTES ..........................This is the normal state for the display when the loop detection
S
TATE...........................Presence Call.
B
ARGRAPH DISPLAY ....Number of se nsit ivit y leve ls tha t the induc tanc e cha nge c aused
7
SEGMENT DISPLAY ....Call.
T
EXT ............................PRESENCE, indicating detection mode of the detector.
D
ETECT LED ...............Solid ON.
D
ETECTOR OUTPUTS ...ON.
E
XAMPLE .....................The detection zone is occupied by a vehicle that exceeds the
S
TATE...........................Timing Delay.
B
ARGRAPH DISPLAY ....Number of se nsit ivi ty levels that the inductance change caused
7
SEGMENT DISPLAY ....Countdown of remaining Delay time (in seconds).
T
EXT ............................SECONDS, DELAY, and PRESENCE.
D
ETECT LED ...............Four Hz flash rate w ith 50% duty cycle (125 ms ON, 125 ms
D
ETECTOR OUTPUTS ...OFF.
E
XAMPLE .....................The detection zone is occupied by a vehicle that exceeds the
S
TATE...........................Timing Ext e nsion.
B
ARGRAPH DISPLAY ....OFF.
7
SEGMENT DISPLAY ....Countdown of remaining Extension time (in sec onds).
T
EXT ............................SECONDS, EXTENSION, and PRESENCE.
D
ETECT LED ...............16.6 Hz flash rate with 50% duty cycle (30 ms ON, 30 ms
D
ETECTOR OUTPUTS ...ON.
E
XAMPLE .....................The detection zone is vacant, there are two and one-half (2.5)
S
TATE...........................Timing Max Presence.
B
ARGRAPH DISPLAY ....Number of se nsit ivit y leve ls tha t the induc tanc e change caused
7
SEGMENT DISPLAY ....Countdown of remaining seconds of Max Presence.
T
EXT ............................SECONDS and MAX PRESENC E.
D
ETECT LED ...............Solid ON.
D
ETECTOR OUTPUTS ...ON.
E
XAMPLE .....................The detection zone is occupied by a vehicle that exceeds the
zone is unoccupied and the detector does not have any timing
options set.
by the vehicle exceeds the detection threshold (first dot =
current sensitivity level, second dot = next lower sensitivity
level, etc.).
detection threshold by four (4) sensitivity levels and the
detector is outputting a call.
by the vehicle exceeds the detection threshold (first dot =
current sensitivity level, second dot = next lower sensitivity
level, etc.).
OFF).
detection threshold by two (2) sensitivity levels, there are three
(3) seconds of Delay time remaining, and the detector is not
outputting a call.
OFF).
second s o f E xt e nsion time remaining, and detector is outputting
a call.
by the vehicle exceeds the detection threshold (first dot =
current sensitivity level, second dot = next lower sensitivity
level, etc.).
detection threshold by five (5) sensitivity levels, there are 30
seconds of Max Presence remaining, and the detector is
outputting a call.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 11 of 23
Page 18
L =
1 © 1 © 1
©
-∆L/L =
1
©
-∆L/L =
1
©
S
TATE...........................Loop Inductance (L) Display (Option 1 ON).
B
ARGRAPH DISPLAY ....OFF.
7
SEGMENT DISPLAY ....Loop / Lead-I n c irc u it i nd uc ta nce in micr o hen rie s. I f t he va lue
T
EXT ............................L =.
D
ETECT LED ...............The detect LED operates normally indicating call, no call,
D
ETECTOR OUTPUTS ...The detector outputs operate normally.
E
XAMPLE .....................The Loop / Lead-In circuit i nductance is 98 micro henries a nd
N
OTES ..........................If Option 1 (L and -∆L/L Displa y) is O N, t his dis play is only
S
TATE...........................% Loop Inductance Change (-∆L/L) Display (Option 1 ON).
B
ARGRAPH DISPLAY ....OFF if no vehicle is detected. Number of sensitivity levels that
7
SEGMENT DISPLAY ....Percentage of change in inductance of the Loop / Lead-In
T
EXT ............................-∆L/L =.
D
ETECT LED ...............The detect LED operates normally indicating call, no call,
D
ETECTOR OUTPUTS ...The detector outputs operate normally.
E
XAMPLE .....................Percentage change of inductance of the call is 10.7% and the
S
TATE...........................% Loop Inductance Change (-∆L/L) Display (Option 1 ON).
B
ARGRAPH DISPLAY ....OFF if no vehicle is detected. Number of sensitivity levels that
7
SEGMENT DISPLAY ....Percentage of change in inductance of the Loop / Lead-In
T
EXT ............................-∆L/L =.
D
ETECT LED ...............The detect LED operates normally indicating call, no call,
D
ETECTOR OUTPUTS ...The detector outputs operate normally.
E
XAMPLE .....................Percentage change of inductance of the last call was 10.7% and
N
OTES ..........................If Option 1 (L and -∆L/L Displa y ) is ON , this d is pla y is vis i ble
exceeds 999, the display will alternate between the thousands
place (1 or 2) and the lower three digits of the inductance value.
delay, and/or extension as expected.
the detector is not detecting a vehicle.
visible when the detector is not detecting a vehicle.
the inductance change caused by the vehicle exceeds the
detection thres hold ( firs t dot = cur rent sen siti vity leve l, sec ond
dot = next lower sensitivity level, etc.) if a vehicle is detected.
circuit.
delay, and/or extension as expected.
detection zone is occupied by a vehicle that exceeds the
detection thre shold b y six (6) sensitivity levels.
the inductance change caused by the vehicle exceeds the
detection threshold (firs t dot = current se nsitivity level, seco nd
dot = next lower sensitivity level, etc.) if a vehicle is detected.
circuit.
delay, and/or extension as expected.
the detection zone is vacant.
for the two seconds following the end of a vehicle detection.
S
TATE ..................................Accumulated Vehicle Count Display
(Option 2.0 ON).
B
ARGRAPH DISPLAY ............OFF if no vehicle is detected. Number of
sensit ivit y leve ls that t he ind ucta nce cha nge
caused by the vehicle exceeds the detection
threshold (first dot = current sensitivity
level, second dot = next lower sensitivity
level, etc.) if a vehicle is detected.
7
SEGMENT DISPLAY ...........The accumulated vehicle count.
T
EXT ....................................None.
D
ETECT LED .......................The detect LED operates normally
indicating call, no call, delay, and/or
extension as expected.
D
ETECTOR OUTPUTS ...........The detector outputs operate normally.
E
XAMPLE .............................The accumulated vehicle count is 21,187.
N
OTES ..................................The display alternates between the upper
two digits and the lowe r three digits. I f the
upper two digits are zero (i.e. the count has
not exceeded 999), they are not displayed at
all and only the lower three digits will be
displayed.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 12 of 23
Page 19
-∆L/L =
LOOP FAIL
OPTION
MAX PRESENCE
OFF
EOG
SCANNING
EXTENSION
SENSITIVITY
DELAY
PULSE
SECONDS
3 2 1
4
ON
©
To train the detector, drag the calibration loop through the center of the
Inductive Loop
Calibration Loop
STATE .............................LCD Test.
B
ARGRAPH DISPLAY .......All segments on.
7
SEGMENT DISPLAY ......All segments on.
T
EXT ...............................All segments on.
D
ETECT LED ..................The detect LED operates normally indicating call, no call, delay
and/or extens ion as expected.
D
ETECTOR OUTPUT ........The detector output operates normally.
E
XAMPLE ........................All segments on.
N
OTES .............................This d isplay is visible wheneve r any tw o pushb utton sw itches
are pressed at the same time.
5.3 OPTION 4: TRAINING MODE
When Option 4 is turned ON, the detector is placed in the Training Mode. To train t he de tector, t urn Option 4 ON.
The LCD w i ll d isp la y CAL. Place the Re no A&E Ca libratio n Loop (not included w ith the detector ) on the gro und
at least two feet away from t he inductive loop a nd slowly drag t he calibration loop thro ugh the center of the lane
making sure that the loop passes over the center of inductive loop. The training process takes approximately five
(5) seconds. Once the training process has been successfully completed, the display will revert from CAL to
Option 4 OFF. Please note that once the training process has been initiated, the only way to abort the process is to
cycle power to the detector. The factory default setting of Option 4 is OFF. NOTE: Proper training is essential
for accurate detection of tailgating vehicles. It is critical that cars or other vehicles do not pass over the
inductive loop while training is in pr ogr e s s .
inductive loop with Option 4 ON.
5.4 OPTION 5: RELAY B OUTPUT MODE
Option 5 is used to control the output mode of Relay B. Option 5 has seven (7) settings, 5.0 through 5.6. A setting
of 5.0 is generally used in applications w here the primary concern accurate counting of passenger vehicle entries.
Option 5 settings 5.1 through 5.6 are used in applicat ions where t he primar y concern is detection o f events t hat are
considered to be exceptions to normal entrance occurrences (tailgating or multiple passenger vehicle entry
occurrences).
When Option 5 is set to 5.0, the detector’s count total is incremented b y one and Relay B provides a 0. 25 second
pulse count output when a passenger vehicle entry has been detected.
Option 5 settings 5.1 through 5.3 are used in applications where the primary concern is detection of tailgating
events. When Option 5 is set to 5.1, 5.2, or 5.3 the detector’s count total is incremented by one and Relay B
provides a pulse output only when a tailgating incident has been detecte d. A tailgating inc ident occurs w hen two
passenger vehicles are over the loop at the same time. T he duration of the p ulse output varies depending o n the
setting of the option. When se t to 5. 1, the pulse duration is 0.25 second. When se t t o 5.2, the pulse duration is one
second. When set to 5.3, the pulse duration is five seconds.
Option 5 settings 5.4 through 5.6 are used in applications where the primary concern is detection of multiple
passenger vehicle entry events. In a normal entrance scenario, one passenger vehicle enters the controlled area for
each c yc le o f t he c o n tr o l in p ut . (I n general , the c o nt r o l input is a ct i ve when the ga te is o p en and inac t i ve when the
gate is closed.)
There are two differe nt o utput sche mes that can occ ur. The first occurs when Opt ion 5 is set to 5.4, 5.5, or 5.6 and
the state of the control input is active (i.e. the gate is open). The detector’s count total is incremented by one and
Relay B provides a pulse output for each passenger vehicle that crosses the loop after the first passenger vehicle
has crossed the loop. Vehicle counts continue to be accumulated until the state of the control input changes (i.e.
the gate closes). As an example, this scenario would occur when a legitimate entry (by the first pas se nger veh icle)
is followed by one or more additional passenger vehicles entering the controlled area before the gate has closed.
The passenger vehicle(s) following the first passenger vehicle would be counted and identified by the pulse output
which could be used to trigger a camera or some other form of recording equipment.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 13 of 23
Page 20
Option 5
Setting
Control Input
State
5.0
N/A
With Ve hicle Entry
0.25 Second
5.1
N/A
With Tailgating Incident
0.25 Second
5.2
N/A
With Tailgating Incident
1 Second
5.3
N/A
With Tailgating Incident
5 Seconds
5.4
Active
With Veh icle Entry Following Lead Vehic le Entry
0.25 Second
5.4
Not Active
With Ve hicle Entry
0.25 Second
5.5
Active
With Veh icle Entry Following Lead Vehic le Entry
1 Second
5.5
Not Active
With Ve hicle Entry
1 Second
5.6
Active
With Veh icle Entry Following Lead Vehic le Entry
5 Seconds
5.6
Not Active
With Ve hicle Entry
5 Seconds
Seconds 0 1 2 3 4 5 6 7
One Vehicle with
One Vehicle with
Seconds 0 1 2 3 4 5 6 7
Relay B Output
Seconds 0 1 2 3 4 5 6 7
If the state of the control input is not active (i.e. the gate is closed), Option 5 sett ings 5.4, 5.5, and 5.6 result in a
slightly different output sche me. The detector’s count total is incremented by one and Relay B provides a pulse
output for every passenger vehicle that crosses the loop. This scenar io would occ ur when a o ne or more pass enger
vehicles enter the controlled area when the gate arm has been broken off. The passenger vehicle(s) entering would
be counted and identified by the p ulse output which could be used to trigger a ca mera or some other form of
recording equipment.
When set to 5.4, the pulse duration is 0.25 second. W hen set to 5.5, the pulse duration is one second. When set to
5.6, the pulse duration is five seconds.
The factory default setting of Option 5 is 5.0.
Relay B Output Relay B Output Duration
The timing charts that follow illustrate the various Option 5 settings and the outp ut states of the two relays.
Option 5 Settings 5.0, 5.1, 5.2, and 5.3
Two Tailgating
Vehicles
Relay A Output
(Presence)
Relay B Output
(Setting 5.0)
One Tailgating
Vehicle
Relay A Output
(Presence)
Relay B Output
(Setting 5.0)
One Vehicle
Relay A Output
(Presence)
Relay B Output
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 14 of 23
(Setting 5.0)
Page 21
LOOP FAIL
1
©
+25% change
conditions.
LOOP FAIL
1
©
-25% change
Seconds 0 1 2 3 4 5 6 7
One Vehicle with
Relay B Output
One Vehicle with
Relay B Output
Seconds 0 1 2 3 4 5 6 7
(Setting 5.4)
Seconds 0 1 2 3 4 5 6 7
Option 5 Settings 5.4, 5.5, and 5.6 (Control Input Active)
Two Tailgating
Vehicles
Relay A Output
(Presence)
One Tailgating
Vehicle
Relay A Output
(Presence)
One Vehicle
Relay A Output
(Presence)
Relay B Output
5.5 OPTION 6: CONTROL INPUT ACTIVE HIGH / LOW
When Option 6 is OFF, the control inp ut is active when it is in a high state. When Opt ion 6 is ON, the c ontr ol
input is active when it is not in a high state. N OTE: Proper detec tor operation r equires that the c ontrol input is
active when the gate or barrier is open.
5.6 LOOP FAILL INDICATIONS
or
open loop
writte n int o the Lo op Fa il Me mor y (si nce t he las t powe r inte rr upt ion or man ual re set) and can be seen by stepping
through the functions in Program Mode to the LOOP FAI L display.
This is a useful tool to identify intermittent loop prob lems. If the count is extremely high for the pe riod of time
observed, the problem is very likely a loose connection (check for loose connections at the terminal strip and bad
splices in the field). The Loop Fail Count is reset when power is removed from the detector. This prevents the
Loop Failure Count from moving to another loop, if the detector is moved to a new location.
889-1207-00 Model L-ATG Operations Manual Rev Apr 2020 Page 15 of 23
or
shorted loop
conditions.
If the total inductance of the loop input network goes out of the range
specified for the detector, or rapidly c hanges by more than ±25%, the
detector will enter t he Fail-Safe mode and LOOP FAIL will be displayed
on the LCD. The type of loop failure will also be displayed as L lo (for 25% change or shorted loop condit ions) or L hi (for +25% cha nge or
open loop conditions). This will continue as long as t he loop fault exists.
Fail-Safe mode generates a continuous call. At the time of a loop failure,
the detect LED will begin to flash at a rate of three flashes per second.
The LED will continue this display patter n until the detector is manually
reset or power is removed.
If the loop self-heals, the LOOP FAIL message on the LCD will
extinguish and the detector will resume operation in a normal manner;
except, the LED will continue the three flashes per second display
pattern, thus, providing an alert that a prior Loop Fail condition has
occurred. Each loop failure is counted and accumulated into the Loop
Fail Memory. The total number of loop failures for the detector is
Page 22
PRESENCE
1
©
The Bargraph is a window that adjusts to the sensitivity setting
SENSITIVITY 9 8 7 6 5 4 3 2 1
% of Inductanc e 0.01 0.02 0.04 0.08 0.16 0.32 0.64 1.28 2.56 5.12 10.24 20.48
PRESENCE
The Bargraph is a window that adjusts to the sensitivity setting
SENSITIVITY 9 8 7 6 5 4 3 2 1
% of Inductanc e 0.01 0.02 0.04 0.08 0.16 0.32 0.64 1.28 2.56 5.12 10.24 20.48
To view the Loop Fail Count, repeatedly press the FUNC pushb utton until the LO O P FA IL displa y is shown. The
Loop Fail Count display is after the O PTION d isplays. Press ing t he (UP) or (DOWN ) p ushbutto n while t he
Loop Fail Count is displayed will reset the count to zero.
NOTE: T he Loo p Fai l Co unt is no t re se t w he n t he de te ct or ’s se ns it ivit y o r freq ue nc y is cha ng ed . The p rio r L oop
Fail indication will continue unt il the Loop Fail Co u nt is reset to zero.
5.7 SETTING SENSITIVITY USING THE BARGRAPH
The bargraph is a graphical representation of the relative change of inductance as seen by the detector. It
automatically takes into account the detector’s sensitivity setting, loop geometry, configuration, lead-in length, etc.
The first bar segment represents the minimum inductance change (set by the sensitivity level) necessary for the
detector to output a call. Each additional segment to the right represents the inductance change in excess of the
next se nsitivit y thresho l d. U s ua l l y, t he la r ge r the veh icle, the gr e at e r t he -∆L/L; thus, more and more segments are
displayed. The bargraph can be used as a precise indicator to select the proper sensitivity level.
The bargraph below shows the deflectio n ( 3 s e gme nts ) o f a v eh ic le w it h S e ns it ivi t y se t t o Le ve l 4 . T he ve hic le i n
the loop zone is causing a change of inductance greater than 1.28% -∆L/L or Sensitivity Level 2.
The bargraph below has the same vehicle in the loop zone causing the same inductance change as above. Since
the sensitivity setting was increased to Level 7, six segments are now displayed. If the bargraph displays 5 or 6
segme nts for a ve hicle in the loop and motorcycles are not a concern, the sensitivity has bee n set to the proper
range.
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Page 23
Step 1: Observe a
Step 2: Go to the
Step 3: Subtract the
Step 4: Verify that a
Step 5: A small
PRESENCE
1
PRESENCE
1
PRESENCE
1
1
SENSITIVITY
1
5.8 SETTING SENSITIVITY FOR MOTORCYCLE DETECTION USING THE
BARGRAPH
The bargraph can also be used to select the proper sensitivity level for small motorcycle detection. The relative
change of inductance caused by a motorcycle and a single automobile are proportional on any loop configura tion.
Selecting the sensitivity level that causes the bargraph to display the seventh segment for a single standard
automobile automatically sets the sensitivity to detect small motorcyc les. Follow the steps below:
single standard automob i l e in t h e loop
zone. Note the number
of segments displayed
on the bargraph. (4)
NOTE: This method applies to conventional loop configurations only. Other loop configurations, such as Quadrupole, will require a
different method to correctly set sensitivity for motorcycle detection. Increasing the sensitivity to detect motorcycles in some loop
configurations will make the loop sensitive to adjacent lane detection. If adjacent lane traffic is detected, the phase will max time
when no vehicles are present in the loop (see Option 5 - Phase Green Loop Compensation for a possible solution).
Program mode. Note
the sensit ivit y level.
(3)
actual number of
segments displaye d
from the desired
number of 7. (7 - 4 =
3) Increase the
sensitivity thr ee levels.
single standard automobile causes the
bargraph to move
seven segments.
motorcycle should be
detected causing a one
segment deflection.
5.9 FULL RESTORE TO FACTORY DEFAULT SETTINGS
Pressi ng al l three fron t pane l pus hbutto n switches si multaneously a nd continuously for five (5) se conds resets t he
detector and restores all the factory default settings. The countdown of the five second period is displayed on the
LCD. Releasing any of the switc hes before the countdown e nds abo rts the Full Restore operation. (See Section
3.5 for default settings.) NOTE: F ollowing a factory de fault reset, the detect or must be recalibrated. Refer to
Section 5.3 Option 4 - Training Mode for d etails .
5.10 DISPLAY TEST
Pressing any two of the front pa nel pushbutton switches simultaneously w ill turn on all possible symbols and
messages on the LCD.
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Page 24
Non-
Memory
Loop
Loop
Power
Input
Voltage
VS
GND
Front Panel
Pushbutton
32 MHz
Loop
Squaring Circuit
Buzzer
+5
Section 6 Block Diagram
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Loop
Inputs
Isolation
Supply
Oscillator
Capacitors
Count
Output
Micro Controller
volatile
Detect
LED
LCD
Switches
Oscillator
Detect
Output
Page 25
Section 7 Theory of Operation
The Reno A&E Model L-ATG detector digita lly measures c hanges in the resona nt frequency of the loop circuit to
determine if a vehicle has entered the detection zone. The Model L-ATG Series detector applies an excitation
volta ge to the loop circ uit resulting in the loop oscillating at its resonant frequency. The current flow in the loop
wire creates magnetic fields around the loop wire. When a vehicle passes over the loop area, the conductive metal
of the vehicle causes a loading of the loop’s magnetic fields. The loading decreases the loop inductance, which
causes the resonant f requency to increase. By continuo usly sampling the loop’s resonant frequency, the magnit ude
and rate of change can be determined. If the frequency change exceeds a selectable threshold (set by the sensitivity
settings), the detector will act ivate an output signal. If the rate of change is slow, typical o f environmental drift, the
detector will continuously track and compensate for the change. The Model L-ATG detector also monitors the
loop frequency for out of range conditions such as an open or shorted loop circuit.
The detector’s oscillator circuit supp lies a n exc itation volta ge that is coup led to t he loop c ircuit by a loop isolatio n
trans former. T he trans former provides high common mode isolation between the loop and detector electronics,
which allows the detector to operate on poor quality loops including a single s hort to ground. The transformer also
limits the amount of static energy (light ning) that can transfer to the detector electronics. A spark gap transient
suppression device is connected across the loop inputs connected to the isolation transformer. This device
dissipates static charges before they reach the transformer. A network of four capacitors is connected to the
detector side of the isolation transformer. Three of the capacitors can be switched in or out of the oscillator circuit
to shift the frequency of the loop oscillator c ircuit thus providing frequency separation between adjacent loops.
The three switchable capacitors are electronically switched using FETs and are selected when programming
parameter val ues with the front panel pushbutton swit ches.
The out p ut f ro m t he loo p o sc i llat or is fed int o a sq uar in g c irc u it. T he s ine wa ve fr o m the loop osc illator c ircuit is
squared to provide a precise zero crossing s ignal for the input to the microcontroller. This s ignal is called t he loop
sample . The lo op samp le is a n integr al numbe r of comp lete os cillat ions fro m the loo p osci llator c ircuit. The
number of loop oscillations counted is a function of the selected sensitivity setting for the detector. The required
number of loop oscillations needed for a loop sample increases as the sensitivity setting is increased. The
microcontrolle r uses the period of the loop sample for accumulating high-speed (32 MHz) crystal clock puls es
generated by the microcontroller’s internal high-speed crystal oscillator. The number of crystal clock pulses
accumulated during consecutive loop samples is compared to the internal reference number of crystal clock pulses
stored in the microcontroller ’s memory.
When a vehicle enters the loop zone the loop inductance decreases. This decrease in loop inductance causes an
increa se in t he loop osc illat or fre que ncy. I n turn, an increase in loop oscillator frequency results in a decrease of
the time period for the loop sample. Hence, when a vehicle enters the loop zone the number of crystal clock pulses
accumulated during a loop sample period decreases. By comparing the new count with the reference count, a
percentage change can be calculated that indirectly relates to the inductance change. If the magnitude of the
change exceeds a selectable threshold (sensitivity setting), the detector activates an output device. The rate of
change is also monitored. Slow rates of change caused by environmental fluctuations are tracked and
automatically compensated for.
The microcontroller uses the high-speed crystal clock count to calculate the loop inductance, frequency and
percentage of change. If selected, the values are displayed on the seven segment LCD. The microcontroller also
processes the pushbutton switch selections for the LCD and stores the operating parameters in non-volatile
memory. Stored parameters are only changed wit h the front pa nel switches a nd are unaffected b y loss o f power or
detector reset. The microcontroller continuously processes the loop samples and the detector operation is not
affected during the operation of the switches or the LCD. (NOTE: When either sensitiv ity or frequenc y is
changed, the detector is reset.)
In add ition, the microc ontrolle r condit ions the outputs b ased on t he progra mmed se ttings o f the var ious timer s
(Delay, Extension, and Max Presence) and opt ions (Option 3, O ption 5, and Option 6).
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Page 26
Symptom
Where To Start
No LCD display and LED not lit.
See Troubleshooting Power Problems.
LCD displays garbage and detector does not
respond to pushbutton presses.
Detector does not respond to pushbutton presses.
See Troubleshooting Initializatio n Pr oblems.
LCD continual ly displays L lo and LOO P F A IL
or L hi and LO OP FAIL.
The detect LED is flashing three times per
correctly.
Detector intermittently sta ys in the Call state.
See Troubleshooting Interm ittent De te cto r Lock U ps .
The sensitivity has been set to Call forcing the detector to
output a constant call.
Section 8 Maintenance and Troubleshooting
The Reno A&E Model L-ATG Detector requires no maintenance. If you are having problems with your Mode l
L-ATG detector, use the troubleshooting chart below to help determine the cause of the problem.
See Troubleshooting Initializatio n Pr oblems.
See Troubleshooting Loop Fail Problems.
second and detector appears to be working
LCD alw ays dis plays a flashi ng CALL.
See Troubleshooting Intermittent Loop Fail Problems.
8.1 TROUBLESHOOTING POWER PROBLEMS
Does the LCD display anything when the detector is powered up?
NO, Do any of the detectors in the cabinet display anything when powered up?
NO, Check the AC or DC Power Supp ly volta ge. Is it greater than 89 V AC and less than 135
VAC (120 VAC models) or greater than 18 0 VAC and less than 270 V AC (240 VAC mode ls)
or greater than 10 VAC and less tha n 30 VAC or grea ter than 10 VDC a nd less t han 30 VDC
(low vo lt a ge models) ?
NO, Determine why power is out of tolerance and have it corrected.
YES, Wiring from the Power Supply to detector is incorrect or defective.
YES, Swap the detector with a working detector. Did the problem follow the swapped
detector?
NO, Confirm correct wiring of the harness and that the pins in the connector are not
damaged.
YES, The swapped unit is defective. Replace the unit.
YES, Probably not a power related problem.
8.2 TROUBLESHOOTING I NITIALIZATION PROBLEMS
Does t he LCD display the Model and Firmware version whe n powered up?
NO, Replace the detector with a known good unit. Does the LCD displa y the Mode l and Fir mware
version when powered up?
NO, The connector or wiring harness is defective. Confirm correct wiring of the harness and
that the connector is not defective or damaged. Check for unexpected voltages on any pin.
YES, Replaced unit was defective.
YES, After two seconds, are three dashes (- - -), CALL, OFF, o r a LOOP FA IL mess age dis pla yed on
the LC D ?
NO, Replace the detector with a known good unit. After two seconds, are three dashes (- - -),
CALL, OFF, or a LOOP FAIL message d isplayed on the LCD?
NO, The connector or wiring harness is defective. Confirm correct wiring of the
harness and that the connector is not defective or damaged. Check for unexpected
volta ges on any pin.
YES, Replaced unit was defective.
YES, The unit is initializing correctly.
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Page 27
8.3 TROUBLESHOOTING LOOP FAIL PROBLEMS
Does the LCD d isplay L hi and LOOP FAIL?
NO, Does the LCD display L lo and LOOP FAIL?
NO, The detector has tuned up to the existing loop / lead-in circuit and it is within acceptable
limits.
YES, There is probably a short in the loop / lead-in circuit. Disconnect the loop from the
terminal block in the cabinet. Does the status now show L hi and LOOP FAIL?
NO, The problem is in the cabinet. Replace the detector with a known good unit.
Does t he status now show L hi and LOOP FA IL?
NO, The detector is not the problem. Measure the resistance from each
loop te rminal t o the pin i n the conne ctor. It s hould read less tha n 0.5
Ohms for both terminals. Check all wiring from terminal block to the
connector in the harness. Also, check that the connector itself is not
defective.
YES, The replaced unit was defective.
YES, The problem is in the field, either a short in the loop / lead-in circuit or
insufficient inductance in the loop / lead-in circuit. Leave the loop disconnected in
the cabinet. Connect a MegOhm meter set to 500 volts to one of the loop wires and
earth ground. I s the resistance greater than 50 megOhms?
NO, There is leakage to earth ground in the loop / lead-in circuit.
Disconnect the loop from the lead-in cable as close as possible to where
the loop enters the pavement. Measure the resistance between one o f the
loop wires and earth ground. Is the resistance greater than 50 megOhms?
NO, The loop is damaged. Replace the loop.
YES, The lead-in cable is defective. Replace lead-in cable.
YES, The problem is insufficie nt inductance in the loop / lead-in circuit.
This i ndicates to o few turns in the loop itself or s ome of the turns are
shorted to each other. In either case, the loop must be replaced to correct
the problem.
YES, If the detector is not being used, you will see this display if the detector has not been turned off. Is
there a loop connected to the detector?
NO, Chan ge the sens itivit y settin g to OFF and the LOOP FAI L message will no longer be
displayed.
YES, There is an open or high resistance in the loop / lead-in circuit. Short across the loop
inputs on the terminal block in the cabinet. Does the status now show L lo and LOO P F A IL?
NO, The problem is in the cabinet. Replace the detector with a known good unit.
Does t he sta tus now s how L lo and LOOP F AIL with the short st ill applied at t he
loop termina ls?
NO, The detector is not the problem. Measure the resistance from each
loop terminal to the pin in the connector. It s hould read less than 0.5
Ohms for both terminals. Check all wiring from terminal block to the
connector in the harness. Also, check that the connector itself is not
defective.
YES, The replaced unit was defective.
YES, The open or high resistance is in the field. With the loop still disconnected,
measure the resistance of the loop / lead-in circuit (from one lead of the loop to t he
other). Is the resistance below five Ohms?
NO, Measure the resistance as close as possible to where the loop enters
the pavement. Is the resistance below two O hms?
NO, The loop is probab ly damaged. Re place the loop.
YES, The lead-in cable is defective. Check all splices. Replace
the lead-in cable if necessary.
YES, The problem is probably excessive inductance. Are there several
loops connected in series for the loop / lead-in circuit?
NO, This is typically c aused by having too many tur ns in a
large loop. Replace the loop with one that has an inductance of
less than 2000 microhenries.
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Page 28
YES, If possible, connecting each loop t o its own detector is
preferred. Or tr y a parallel wir ing arrangement for the loops if
separate detector is not possible.
8.4 TROUBLESHOOTING INTERMITTENT LOOP FAIL PROBLEMS
Have you been able to see the detector display while the loop failure was occurring?
NO, Loop Fail problems tend to be bad splices in the loop / lead-in circuit, shorts in the loop / lead-in
circuit, shorts to earth ground in the loop / le ad-in circuit, or loose co nnections or bad s older joints in the
signal cabinet. If you have any splices that are not soldered and sealed with an a dhe si ve he at s hr ink o r
epoxy resin, replace the splice with one that is. Using a MegOhm meter, measure the resistance from
one of the loop wires to earth ground. It should be greater t han 50 megOhms. I nspect the loop. Look
for exposed wires or debris pressed into the saw cut. Tighten all screw terminals in the signal cabinet
that the loop circuit uses. Check solder joints in the loop circuit, especially on the harness itself.
Disconnect and reconnect any connector used in the loop c ircuit and check for loose pins a nd sockets in
these c onnect ors. If your ca binet ha s ligh tning or surge s uppres sion de vices on the lo op inp uts in the
cabinet, remove or replace them. Check for places in the field where the loop wire or lead-in cable ma y
be pinc hed or chaffed. Look for w ires pinched under junc tion box covers and w here the wire enters a
conduit, especially where the loop wire leaves the saw cut and enters a conduit. After checking all of the
above items, you could swap out the detector but this type of failure is rarely ever related to the detector.
YES, Did t he display show L hi?
NO, The display must have bee n L lo then. This indica tes an intermittent s horted loop or -
25% inductance change. Using a Me gO hm meter, measure the resistance from one of the loop
wires to earth ground. It should be greater than 50 megOhms. Inspect the loop. Look for
exposed wires or debris pressed into the saw cut. Check for places in the field where the loop
wire or lead-in cable may be pinched or chaffed. Look for wires pinched under junction box
covers and where the wire enters a conduit, especially where the loop wire leaves the saw cut
and enters a conduit. If your cabinet has lightning or surge suppression devices on the
loop inputs in the cabinet, remove or replace them.
YES, This indicates an intermittent open loop or +25% inductance change. If you have any
splices that are not soldered and sealed with an adhesive heat shrink or epoxy resin, replace the
splice with one that is. Tighten all screw terminals in the s ignal cabinet that t he loop circuit
uses. Check solder joints in the loop circuit, especially on the harness itself. Disconnect and
reconnect any connector used in the loop c ircuit and check for loose pins and socke ts in these
connectors.
8.5 TROUBLESHOOTING INTERMITT EN T D ET EC TO R LO CK UPS
Have you been able to see the detector display while the loop was locked up?
NO, See Troubleshooting Intermittent Loop Fail Problems and follow the path for unable to see the
detector display while the loop failure was occurring.
YES, Were more than t wo segments lit in the bargraph o n the LCD?
NO, Problems of this type tend to be difficult to isolate due to the many pos sible causes and
the short duration of the symptom (usually less t han 30 minutes). If the prob lem occurs more
frequently in the morning or when raining, s uspect a short to ea rth ground in t he loop / lead -in
circuit. This can usually be verified by testing with a MegOhm meter but not always.
Vibration can also be a possible cause. Loop w ires may be moving slightly in a conduit due to
vibrations from truck traffic. Utility lids in the street near the loop may also be a source of
problems. Ensure that lids near a loop are bolted down so that they cannot move. Check that
each set of loop wires is twisted together in each pull box and that lengths are not excessive.
And also see
loop failure that displays L lo on the LCD .
YES, See Troubleshooting Intermittent Loop Fail Problems and follow the path for a loop
failure that displays L lo o n the LCD.
Troubleshooting Interm ittent Loop Fail Proble ms and follow the path for a
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Page 29
8.6 THINGS TO KNOW ABOUT LOOPS
Always use a wire with cross-linked Polyet hylene insu la tion (ins ulation type XLPE) for loop wire.
Typical sensing height is ⅔ of the shortest leg of a loop. Therefore, a 6΄ x 6΄ loop will have a detection height of 4΄.
The inductance of a conventional four-sided loop can be estimated using the formula:
L = P x (T2 + T) / 4 Where: L = Loop Inductance in microhenries
P = Loop Perimeter in feet
T = Number of Turns of Wire.
Therefore, a 3΄ by 6΄ loop with 4 turns would have an inductance of:
L = (3 + 6 + 3 + 6) x (42 + 4) / 4
L = 18 x (16+ 4) / 4
L = 18 x 20/ 4
L = 18 x 5
L = 90 microhenries.
Loop Feeder cable typically adds 0.22 microhenrie s of inductance per foot of cable.
Total inductance of loops connected in series: L
Total inductance of loops connected in parallel: L
= L1 + L2 + L3 + . . . + LN.
TOTAL
= 1 / [ (1 / L1) + (1 / L2) + (1 / L3) + . . . + (1 / LN) ].
TOTAL
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