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D-TEK Vehicle Loop Detector - Operating Instructions

EMX-D-TEK-BOX Start Page (prices and ordering)
Technical Information || Front Indicators || Front Controls || Back Controls
Dip Switch Functions || Dip - Detector Functions || Troubleshooting || Technical Specifications

EMX has designed the new D-TEK vehicle loop detector with the following objectives in mind:

  1. Compact package to allow easy installation into small operator housings.
  2. All the controls are acccessible from the outside for easy installation and operation.
  3. Integral loop conditioner is provided, to enable detector operation with marginal loops.
  4. Provide all the features and controls necessary for a variety of applications.
  5. Use metal housing for maximum durability and RF blocking.
  6. Provide maximum surge protection on all inputs and outputs of the detector.

They took extra care to achieve and exceed these objectives. For example the controls are divided into two groups. The group on the front of the detector is for basic operation and the group on the back of the detector is for advanced settings. This way the more advanced settings are not visible to the casual user.

There is no skimping on the quality in the D-TEK detector. The housing is made from aircraft quality anodized aluminum. All the switches have gold plated contacts and are sealed for protection. The detector is protected by easily replaceable fuse, snubbing circuitry on the relay contacts, metal oxide varistor on the power input and triple protection on the loop input.

The D-TEK features are extensive and they include full loop diagnostics with frequency counter, 10 sensitivity settings, delay and extend features, “fail safe” and “fail secure” operation, automatice sensitivity boost, pulse or two presence relay operation and more.

Technical Information

Detector Connections

Pin Function Harness
1 Power White
2 Power Black
3 Relay N.O Orange
4 Ground Green
5 Presence Relay Comm. Yellow
6 Presence Relay N.O. Blue
7 Loop Gray
8 Loop Brown
9 Relay 2 Comm. Red
10 Presence Relay N.C. White/Blk or Pink
11 Relay 2 N.C. White/Red or Violet
Note: Functions on pins 6 and 10 are reversed if DIP 4 is set to OFF “Fail Secure” operation

Front Indicators

  1. Green Led is ON - the detector is powered.
  2. Red Led is ON- the detector detected a vehicle.
  3. Green Led is Blinking - the loop failed and is shorted or disconnected.
  4. Green Led is Blinking with two consecutive fast blinks - the loop failed in the past and now is working properly.
  5. Red Led is Blinking at the start of a vehicle detection - the Filter function is ON
  6. Red Led is Blinking at the end of a vehicle detection - the Extend function is ON
  7. Red Led is Blinking during a vehicle detection - 4 minute limited presence time has expired.
    Note: Functions on pins 6 and 10 are reversed if DIP 4 is set to OFF.

Front Controls

Reset This toggle switch when pused momentarily down will reset the detector
Frequency Counter this toggle switch when pushed momentarily up will count the frequency of the loop.  This count is displayed by the Red Led blinks, each blink represents frequency of 10K Hz. Count between 3 to 13 blinks confirms that the loop detector is tuned to the loop.
Frequency This toggle switch controls the loop frequency. Set different frequencies on adjacent loops. Verify frequencies with the frequency counter by counting the Red Led blinks.

Back Controls

Sensitivity

This rotary switch controls the detector sensitivity. During normal operation the sensitivity level is set to 3 or 4.

DIP Switch Functions

DIP OFF ON
1 Pulse on Relay II Presence on Relay II
2 Pulse on Detect Pulse on Un-detect
3 Constant presence 4 minute limited presence time
4 “Fail Secure” “Fail Safe”
5 Filter Off Filter ON
6 ASB Off Automatic Sensitivity Boost On
7 Extend detect 6 seconds
8 Extend detect 3 seconds

When DIP 7 and 8 are in ON position the extend time is 9 seconds.
Warning: Do not use limited presence setting and/or “Fail Secure” setting for reversing gates, doors or barriers.

DIP- Detector Functions

  1. Presence function is provided always by the presence relay output on pins 5, 6, and 10. These outputs are active when the detector detects a car. If there is a need for an addtional presence output the Relay 2 can be configured as a second presence output by setting DIP 1 to ON position.
  2. Pulse function is provided by the Relay 2 output on pins 3, 9, and 11. To obtain pulse on Relay 2 set DIP 1 to OFF position. The pulse of about 0.5 second can be generated when the car enters the loop or when it exits. To generate pulse on vehicle entry to the loop set DIP 2 to OFF position. To generate pulse on vehicle exit from the loop set DIP 2 to ON position.
  3. The presence relay provides constant output as long as the car is detected on the loop. To obtain constant presence time set DIP 3 to OFF position. In some applications limited presence time is required. To obtain limited presence time of approximately 4 minutes set DIP 3 to ON position. Be aware that the detector relay will be released after 4 minutes even if the vehicle is still detected by the detector. This may be a serious hazard in applications where gates, doors or barriers are reversed, therefore never use this option in these applications.
  4. When DIP 4 is set to ON position the detector works in “Fail Safe” mode of operation the detector will issue a detect signal when a car is detected, loop is disconnected or shorted, or when the power to the detector is interrupted. It is strongly recommended to use the detector in this mode.
    In some applications there is a need to ignore the loop or power failures and only to provide the detect signal when a car is detected on the loop. To ignore loop or power failures set the detector to “Fail Secure” by setting DIP 4 to OFF position. Do not use this setting for applications where gates, doors or barriers have to be reversed. NOTE: Functions on pins 6 and 10 are reversed if DIP 4 is set to OFF.
  5. In some applications it is necessary to filter out short detections such as cross traffic or short burst of radio frequency such as keying of a CB transmitter. To ignore these short detections set DIP 5 to ON position. This will cause any detection that is shorter than 2 seconds to be ignored.
  6. To increase detection height when detecting high bed vehicles set DIP 6 to ON position. This setting will cause the sensitivity to automatically increase once the front axle of a truck is detected. The sensitivity will go back to the normal level once the truck left the loop.
  7. To extend the presence output for 6 seconds after the vehicle left the loop set DIP 7 to ON position.
  8. To extend the presence output for 3 seconds after the vehicle left the loop set DIP 8 to ON position.
    NOTE: If DIP 7 and DIP 8 are set to ON position the presence output will be extended 9 seconds after the vehicle left the loop.

Troubleshooting

Symptom Possible Cause Correction
Green indicator is not ON No input voltage
  1. Check voltage on pins 1 and 2
  2. Replace internal fuse
  3. Check wiring to detector.
Green indicator flashes Loop wire shorted or disconnected
  1. Check loop resistance on disconnected pins 7 and 8 it should be less than 5 ohms and more than 0.5 ohms.
Green indicator flashes with two consecutive fast blinks Loop wire was temporarily shorted or disconnected
  1. Check loop resistance pins on pins 7 and 8 while driving over the loop, it should be less than 5 ohms and more than 0.5 ohms. The reading should be steady
Detector stays in detect mode after the car left the loop and fails to undetect.
  1. Faulty loop
  2. Poorly crimped terminals
  3. Loose connections
  1. Perform megger test between loop lead and ground the reading should be larger than 100 megaohms.
  2. Check that loop is tightly connected to proper terminals.
  3. Check that splices are tightly soldered and sealed against moisture.
Detector detects intermittently even when there is no car on the loop.
  1. Faulty loop
  2. Poorly crimped terminals
  3. Loose connections
  4. Cross-talk between adjacent loop detectors
  1. Perform megger test between loop lead and ground.  The reading should be larger than 100 megaohms.
  2. Check that loop is tightly connected to proper terminals.
  3. Check that splices are tightly soldered and sealed against moisture.
  4. Set adjacent loops on different frequencies.

Technical Specifications

Power: the detector is available in the following voltages, 12V AC/DC, 24V AC, 24V DC, 110V AC, 220V AC. maximum current draw 100mA.
Temperature: -40 to +180 F
Environmental Protection: Circuit board is conformally coated
Enclosure: Extruded anodized aluminum Height = 3.25 inches 83 mm
Width = 2.56 inches 40 mm
Depth = 3.65 inches 90 mm
Output Relays: 5A/125 V AC standard version, 1A/125 V AC low current version
Connector: 86CP11 compatible with 11 pin Octal DIN rail mountable socket or wire harness
Surge Protection: The detector is protected with neon discharge lamps, zenner diods and surge arrestors.
Loop Input: Transformer is isotated
Grounded Loop: The loop isolation transformer allows operation with poor quality loopers
Loop Inductance Range: 20 to 2000 microhenries with Q factor of 5 or higher.
Tuning: Detector automatically tunes to the loop after power application or reset.
Tracking: Detector automatically tracks and compensates for environmental changes
Power Indicator: Green LED solid light indicates power
Loop Failure Indicator: Green LED blinks indicates loop problem
Loop Failure Memory: Green LED blinks with fast consecutive blinks indicates past loop problem that healed
Detect Indicator: Red LED solid light indicates detection
Extend Indicator: Red LED blinks after a car left the loop indicates time extend feature
Sensitivity: is set by 10 position rotary switch
Frequency: is set three position toggle switch
Infinite Presence Mode: DIP switch selectable presence

Limited 4 minutes
Presence Time:

DIP switch selectable
Second Presence Relay: DIP switch selectable
Pulse on Exit/Entry: DIP switch selectable
Fail Safe/Secure: DIP switch selectable
Filter: DIP switch selectable 2 seconds
Extended Detection: DIP switch selectable 3, 6 and 9 seconds.