RAE L-ATG Operations Manual

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

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 .

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

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.)

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.

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.

to 120 ft2). When activated, the detector’s Max

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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