EDI LMD Series Manual de usuario

THIS MANUAL CONTAINS TECHNICAL INFORMATION FOR THE

LMD602, LMD602T, LMD604, and LMD604T SERIES INDUCTIVE LOOP MONITOR.

REVISION: MARCH 2012

pn 888-060X-001

LMD602 and LMD604

Series

Inductive Loop Monitor

Operations Manual

THE LMD602 AND LMD604 SERIES IS DESIGNED AND MANUFACTURED

IN THE USA BY EBERLE DESIGN INC.

PHOENIX, ARIZONA

EDI IS CERTIFIED TO ISO 9001:2008 QUALITY SYSTEMS STANDARDS.

INFORMATION CONTAINED HEREIN IS PROPRIETARY TECHNICAL INFORMATION

OF EBERLE DESIGN INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE OR

PART IS NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING.

DEFLECTOMETER IS A TRADEMARK OF EBERLE DESIGN

U.S. PATENT NO. 7,855,893

Table of Contents

Section 1 GENERAL ...............................................................................................................1

1.1 Description....................................................................................................................1

1.2 Overview.......................................................................................................................1

1.3 DEFLECTOMETER® Feature.....................................................................................1

Section 2 Installation and Adjustments...............................................................................3

2.1 Set the Sensitivity Level...............................................................................................3

2.1.1 Adjusting Sensitivity Using the DEFLECTOMETER (Recommended) ............3

2.1.2 Adjusting Sensitivity Directly..............................................................................3

2.1.3 Dynamic DEFLECTOMETER Display Operation..............................................4

2.2 Set the Operational Mode............................................................................................4

2.2.1 Output Call Test..................................................................................................4

2.2.2 Short Presence Mode (S)...................................................................................4

2.2.3 Long Presence Mode (L)....................................................................................4

2.2.4 Pulse Mode (P)...................................................................................................4

2.2.5 Call Mode (C) .....................................................................................................5

2.2.6 Off Mode (-) ........................................................................................................5

2.3 Set the Frequency........................................................................................................5

2.3.1 Displaying the Loop Frequency .........................................................................5

2.4 Set the Delay and Extend Timing (LMD602T and LMD604T Only)...........................5

2.4.1 Delay Timing.......................................................................................................5

2.4.2 Extend Timing.....................................................................................................5

2.4.2.1 Extend Always (default)............................................................................6

2.4.2.2 Extend on Green (EOG)...........................................................................6

2.4.3 Timer Control Inputs...........................................................................................6

2.5 Miscellaneous...............................................................................................................6

2.5.1 Channel Off.........................................................................................................6

2.5.2 Retune or Reset a Channel ...............................................................................6

2.5.3 Factory Default Settings.....................................................................................6

2.6 Loop Fault Monitoring..................................................................................................6

2.6.1 Current Fault.......................................................................................................7

2.6.2 Previous Fault.....................................................................................................7

Section 3 Loop Installation....................................................................................................8

Section 4 Specifications ......................................................................................................10

4.1 Mechanical .................................................................................................................10

4.2 Environmental ............................................................................................................10

4.3 Electrical.....................................................................................................................10

4.4 Tuning.........................................................................................................................10

4.4.1 Loop Inductance (Tuning) Range ....................................................................10

4.4.2 Environmental Tracking ...................................................................................10

4.4.3 Grounded Loop Operation ...............................................................................10

4.4.4 Lead-in Length..................................................................................................10

4.5 Loop Input (Lightning Protection) ..............................................................................10

4.6 Response Timing .......................................................................................................11

4.6.1 LMD602 Series Response Timing...................................................................11

4.6.2 LMD604 Series Response Timing...................................................................11

4.7 LMD602(t) Connector Pin Assignments....................................................................11

4.8 LMD604(t) Connector Pin Assignments....................................................................12

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 1

Section 1

GENERAL

1.1 DESCRIPTION

The LMD602 two channel and LMD604 four channel Nema TS-1 rack mounted inductive

Loop Monitor with DEFLECTOMETER® Series is built on the international card format with

double-sided 44 pin edge connectors for connection of power, loop inputs and call outputs.

The units meet or exceed all requirements for detectors as defined in Nema Standard

TS1-1989 (R2005). Each channel has individual controls for setting up sensitivity,

operational mode and frequency on the front panel. Two high intensity front panel LEDs

indicate vehicle detection, timing operation and fault monitoring status for each channel.

Call outputs are available in either relay or optically-isolated solid-state transistor form.

LMD602 Two Channel

Model Channels Features

LMD602-R Two Channel Relay Outputs

LMD602T Two Channel Delay and Extension Timing

LMD602T-R Two Channel Delay and Extension Timing, Relay Outputs

LMD604 Four Channel

LMD604T Four Channel Delay and Extension Timing

1.2 OVERVIEW

A dynamic Overview of the LMD operation which includes an LMD Simulator is available on

the EDI Web Site; www.EDItraffic.com.

1.3 DEFLECTOMETER® FEATURE

The LMD Series Loop Monitor introduces a concept to the inductive loop detector field that

revolutionizes the process of installing and programming a loop detector. The new user

interface of the LMD Series provides the feedback necessary to the signal technician to

quickly and accurately program the parameters of the detector exactly to the loop plus lead-

in system characteristics.

Loop diagnostic capabilities incorporated within the LMD Series Loop Monitor enable the

detection of short or open circuit loops and sudden changes of inductance exceeding 25

Why guess when you can know!

The DEFLECTOMETER display shows the relative strength of the call while a

vehicle is in the detection zone. This provides feedback that the unit is

optimally tuned to detect vehicles of all sizes.

Setting the sensitivity level of the detector can be easily done in one step with

a “typical” vehicle parked in the detection zone. The DEFLECTOMETER

display updates dynamically as the sensitivity level is changed. See section

2.1.1.

The simple push-button interface is intuitive and eliminates many of the

reliability problems found with tiny DIP switches of conventional detectors.

Operational mode, Frequency, and Sensitivity are all programmed and

displayed using the push-button interface. Settings are stored in non-volatile

memory.

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 2

percent of the nominal inductance. Each type of fault is signified by the fault indicator

emitting a different flash sequence. This information can greatly assist the user in the

diagnosis of loop related problems.

The unit will detect inductance changes as small as 0.010% ∆L/L. Each channel is

sequentially energized and sampled so as to negate the possibility of crosstalk between

loops connected to different channels of the same detector.

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 3

Section 2

Installation and Adjustments

2.1 SET THE SENSITIVITY LEVEL

The DEFLECTOMETER (front panel 7-segment LED display) aids in setting the detector to

the most optimum sensitivity level to ensure the detection of all vehicles, including

motorcycles and high bed vehicles.

For typical vehicles (mid-size vehicle / small pick up) utilizing properly installed roadway

loops, when the Call Strength value 4, 5, or 6 (5 being optimum) is displayed on the

DEFLECTOMETER during the DETECT output period then the sensitivity level is set

correctly. For high profile vehicles (commercial trucks, 4x4’s, etc…), a DEFLECTOMETER

Call Strength value of 4 will be best. For low profile vehicles (sports cars, etc…), a

DEFLECTOMETER Call Strength value of 6 will be best.

2.1.1 ADJUSTING SENSITIVITY USING THE DEFLECTOMETER (RECOMMENDED)

The DEFLECTOMETER should read zero (0) with no vehicle over the roadway loop. With a

typical mid-sized vehicle in the detection zone (DET indicator On), the DEFLECTOMETER

will display the Call Strength value (1 - 9).

If a mid-size vehicle, located over the roadway loop causes the Call Strength value “7” to

be displayed on the DEFLECTOMETER, the sensitivity should be lowered two levels (7 – 2

= DEFLECTOMETER reading “5”). This is done by pressing the front panel SENS(down)

button twice.

If a mid-size vehicle, located over the roadway loop causes the value “2” to be displayed on

the DEFLECTOMETER, the sensitivity should be increased three levels (2 + 3 =

DEFLECTOMETER reading “5”. This is done by pressing the front panel SENS(up)

button three times.

NOTE: The DEFLECTOMETER dynamically updates after each Sensitivity Level

change, allowing changes to the Sensitivity setting while a vehicle remains in

the loop detection zone. Note that the Call Strength value may be different than

the actual Sensitivity Level setting.

2.1.2 ADJUSTING SENSITIVITY DIRECTLY

The LMD Series offers nine levels of sensitivity (1 to 9). The Sensitivity Level can be

manually set to any desired level by pressing the SENSor SENSfront panel buttons



While the LMD Series unit is in the Call state (DEFLECTOMETER = 1-9), the

DEFLECTOMETER displays the Call Strength (1 – 9). The Call Strength will

increase or decrease one step as the Sensitivity Level is increased or

decreased one step.

The Call Strength value will depend on the size and type of vehicle in the

detection zone as well as the Sensitivity Level setting of the channel. The

optimum value for a mid-sized vehicle is 5.

The procedure in section 2.1.1 provides a quick and simple way to program

the Sensitivity Level to the optimum setting to ensure all classes of vehicles

are reliably detected with one simple step.

The resulting Sensitivity Level can be then be displayed using the procedure

in section 2.1.2. While the LMD Series is in the No-Call state

(DEFLECTOMETER = 0

), the DEFLECTOMETER will display the Sensitivity

Level (1 – 9) when either SENS button is pressed once.

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 4

when a vehicle is NOT over the roadway loop. The Sensitivity Level will be now displayed

on the DEFLECTOMETER. Pressing the SENSor SENSbutton once will display the

Sensitivity Level without changing the setting. After pressing the SENSor SENS

buttons to display the Sensitivity Level, the setting can then be modified by pressing the

SENSor SENSbuttons again. The display will automatically return to the normal

display after three seconds. The factory default Sensitivity Level is 6.

Sensitivity

∆L / L

Sensitivity

∆L / L

0.01%

0.32%

0.02%

0.64%

0.04%

1.28%

0.08%

2.56%

0.16%

Note that each change of the Sensitivity Level while in this “direct adjust” mode causes the

LMD Series to retune.

2.1.3 DYNAMIC DEFLECTOMETER DISPLAY OPERATION

While the LMD Series is in the Call state (DEFLECTOMETER = 1-9), the

DEFLECTOMETER displays the Call Strength (1 – 9). When the Call terminates (DET

indicator Off) the Call Strength will be displayed for an additional three seconds. Pressing

the SENSor SENSbutton during this interval will modify the Sensitivity Level as

described in section 2.1.1, with the DEFLECTOMETER display remaining in the Call

Strength mode.

Pressing the SENSor SENSbutton when the LMD Series is not in the Call state

(DEFLECTOMETER = 0) will display and modify the Sensitivity Level directly as described

in section 2.1.2. In this case the DEFLECTOMETER displays the actual Sensitivity Level.

2.2 SET THE OPERATIONAL MODE

Operational mode can be set to Short Presence, Long Presence, Pulse, Call or Off mode.

Pressing the MODE button once will display the Operational Mode without changing the

setting. After pressing the MODE button to display the current Operational Mode, the

setting can then be changed by pressing the MODE button again. The display will

automatically return to the normal display after several seconds.

Changing the Operational Mode will cause the channel to retune.

2.2.1 OUTPUT CALL TEST

When the MODE button is pressed and held for one second, the unit will generate a pulsed

(125 ms) Call state (true) output every 1500 ms. This operation can be used to quickly

verify that a Call output is being received by the Controller Unit.

2.2.2 SHORT PRESENCE MODE (S)

The Short Presence mode will tune out a continuous Call after 30 minutes. Use Short

Presence unless the detection zone is expected to be continuously occupied for periods of

time in excess of 30 minutes.

2.2.3 LONG PRESENCE MODE (L)

The Long Presence mode will tune out a continuous Call after 120 minutes.

2.2.4 PULSE MODE (P)

The Pulse mode will provide a 125 ms ± 25ms width output pulse for each vehicle entering

the loop.

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 5

2.2.5 CALL MODE (C)

The Call mode will set the channel output to the Call state (True). This mode can be used

to provide a continuous Call state to the Controller Unit regardless of the state of the

detection zone. Loop fault conditions are ignored in this mode.

2.2.6 OFF MODE (-)

The Off mode will set the channel output to the No Call state (False). This mode can be

used if the channel is not used or not connected to a loop. Loop fault conditions are ignored

in this mode.

2.3 SET THE FREQUENCY

Pressing the FREQ button once will display the Frequency

Level (1 – 4) without changing the setting. After pressing

the FREQ button to display the current Frequency Level,

the setting can then be changed by pressing the FREQ

button again. The display will automatically return to the

normal display after several seconds.

The Frequency level needs to be changed only if

interference occurs between adjacent loops connected to

different sensor units. Interference or crosstalk may manifest itself as chattering of the call

output or a detect call occurring at the same time as an adjacent unit when there is no

vehicle present. If crosstalk is suspected, try to separate the frequencies of the channels

causing the problem. A minimum of 5 KHz separation is recommended. Four frequency

levels are available on each channel to assist in alleviating interference affecting more than

two units.

Changing the Frequency Level will cause the channel to retune.

2.3.1 DISPLAYING THE LOOP FREQUENCY

The current loop frequency is displayed by after pressing the FREQ button to display the

current Frequency Level. The frequency is shown in KHz with a “-“ symbol displayed both

before and after the numeric digits shown on the DEFLECTOMETER.

For example, after pressing the FREQ button once the display sequence might show:

“3” “-“ “2” “7” “-“

This sequence would indicate Frequency Level “3” and a loop reference frequency of 27

KHz.

2.4 SET THE DELAY AND EXTEND TIMING (LMD602T AND LMD604T ONLY)

2.4.1 DELAY TIMING

For each channel, a delay time of 1 to 63 seconds can be set via the DELAY DIP switches.

The numeric sum of the switches in the On position is equal to the Delay time. Call Delay

time starts counting down when a vehicle enters the loop detection area. During the Delay

time the DET indicator will flash two times per second and the DEFLECTOMETER will

display the letter “d”. Delay time can be overridden by a True signal at the Timer Control

input.

2.4.2 EXTEND TIMING

For each channel, an extend time of 0.25 to 15.75 seconds can be set via the EXTEND DIP

switches. The numeric sum of the switches in the On position is equal to the Extend time.

Frequency

Level 4

High

Level 3 Medium

High

Level 2 Medium

Low

Level 1

Low

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 6

2.4.2.1 EXTEND ALWAYS (DEFAULT)

Call Extend time starts counting down when the last vehicle clears the loop detection zone.

During the Extend time the DET indicator will flash four times per second and the

DEFLECTOMETER will display the letter “E”. Any vehicle entering the loop detection zone

during the Extend time period causes the Extend timer to be reset and the output

maintained. The Timer Control input has no effect on this mode.

2.4.2.2 EXTEND ON GREEN (EOG)

Call Extend time starts counting down when the last vehicle clears the loop detection zone

if the Timer Control input is True (low). During the Extend time the DET indicator will flash

four times per second and the DEFLECTOMETER will display the letter “E”. Any vehicle

entering the loop detection zone during the Extend time period causes the Extend timer to

be reset and the output maintained.

The Extend on Green mode is enabled by a factory installed jumper located at E6 on the

pcb. Consult the factory for details.

2.4.3 TIMER CONTROL INPUTS

Timer Control inputs are provided for each channel to modify the operation of the Delay

and Extend Timing functions. The application of a True (low) state voltage will inhibit the

Delay timing function and/or enable the Extend timing function as described in sections

2.4.1 and 2.4.2.2. When the Timer Control Input is True (low) the decimal point of the

channel DEFLECTOMETER display will illuminate.

Timer Control inputs are primarily provided for downward compatibility.

2.5 MISCELLANEOUS

2.5.1 CHANNEL OFF

If a channel is not to be used, it may be switched off (disabled) by setting the Operational

Mode to OFF. See section 2.2.6.

2.5.2 RETUNE OR RESET A CHANNEL

Press the MODE and FREQ buttons simultaneously to reset the channel. This will clear any

previous loop fault indication and cause the channel to retune.

2.5.3 FACTORY DEFAULT SETTINGS

Press the Channel 1 MODE and FREQ buttons simultaneously while first applying power to

the unit to reset all channels to the factory default settings.

Factory Defaults

Sensitivity Level

Operational Mode

Short Presence

Frequency Level

High

2.6 LOOP FAULT MONITORING

The LMD Series Loop Monitor continuously checks the integrity of the loop. The system is

able to detect open circuit loops, shorted loops, or sudden changes in inductance

exceeding 25% of the nominal inductance.

LMD602 and LMD604 Series

Operations Manual

Eberle Design Inc. Page 7

2.6.1 CURRENT FAULT

If a fault is detected, both the DET (Red) and FLT (Yellow) LEDs continuously emit a

sequence of flashes and the DEFLECTOMETER will display the letter “F”. Each type of

fault is identified by a different flash sequence followed by a one second pause:

Flash Sequence

Fault

1 flash Open Circuit Loop (or Inductance too high)

2 flashes

Shorted Circuit Loop (or inductance too low)

3 flashes

>25% Change in Inductance

2.6.2 PREVIOUS FAULT

If the fault condition is removed, the DET indicator and the channel output will return to

normal operation. The FLT indicator will continue to flash indicating that a fault had

previously occurred. This Previous Fault indication may be reset by momentarily pressing

the MODE and FREQ buttons simultaneously. See section 2.5.2.

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