MVP-D-TEK Vehicle Loop Detector
9 Volts DC to 240 Volts AC
Operating Instructions
We have designed the new MVP-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 accessible 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.
We 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 MVP-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 a thermal resettable fuse, snubbing circuitry on the relay
contacts, metal oxide varistor on the power input and triple protection on the loop input. The
MVP-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, automatic
sensitivity boost, pulse or two presence relay operation and more.
Technical Information
Detector Connections
Pin Function Harness
1 Power 9V DC - 240V AC White
2 Power Black
3 Relay 2 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. Pink
11 Relay 2 N.C. Violet
Note: Functions on pins 6 and 10 are reversed if DIP 4 is set to OFF "Fail Secure" operation
Technical Specifications
Power: The MVP detector operates across the 9V DC - 240V AC power
range.
Current Consumption: 19.2 mA @ 9 VDC 18.8 mA @ 12 VDC
17.3mA @ 24 VAC 9.5 mA @ 24 VDC
13.5 mA @ 115 VAC 11.0 mA @ 237 VAC
Temperature: -40F to + 180F
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: 1A/30V DC
Connector: 86CP11 compatible with 11pin Octal DIN rail mountable socket or
wire harness
Surge Protection: The detector is protected with neon discharge lamps, zenner diodes
and surge arrestors.
Loop Input: Transformer isotated
Grounded Loop: The loop isolation transformer allows operation with poor quality
loops.
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. DIP switch 4 set to fail
secure, Relay 2 may be used to act as loop failure output to control
board.
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: Set by ten position rotary switch
Frequency: Set by three position toggle switch
Infinite Presence Mode: DIP switch selectable presence
Limited 4 Minutes DIP switch selectable
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
Exteded Detection: DIP switch selectable 3, 6 and 9 seconds
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 correctly.
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.
Front Controls
Reset This toggle switch when pushed momentarily down will reset the detector
Frequency Counter This toggle switch when pushed momentarily up will count the frequency on
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
ONOFFDIP
Presence on Relay II Pulse on Relay II1
Pulse on Un-detect Pulse on detect2
3
presence
4 minute limited presence time Constant
"Fail Safe" "Fail Secure"4
Filter On Filter Off5
Automatic Sensitivity Boost On ASB Off 6
6 seconds Extend detect7
3 seconds Extend detect8
(When Dip7 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 additional
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 by 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
application 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 application 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 the 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.
Trouble Shooting
CorrectionPossible CauseSymptom
not ON
Green indicator
flashes
Green indicator
flashes with two
consecutive fast
blinks
Detector stays in
detect mode after
the car left the loop
and fails to
undetect.
Detector detects
intermittently even
when there is no
car on the loop.
No input voltageGreen indicator is
Loop wire shorted
or disconnected
Loop wire was
temporarily
shorted or
disconnected
1. Faulty loop
2. Poorly
crimped terminals
3. Loose
connections
1. Faulty loop
2. Poorly
crimped terminals
3. Loose
connections
4. Cross-talk
between adjacent
loop detectors
1. Check voltage on pins 1 and 2.
2. Replace internal fuse
3. Check wiring to detector
1. Check loop resistance on pins 7 and 8 it should be less
than 5 ohms and more than 0.5 ohms.
1. Check loop resistance 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.
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.
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.
Place
Address
Label
Here
Loading...