Feig Electronic VEK S4 User Manual
VEK S4 Manual
2009-03-31
S4_Handbuch_GB_090331.doc
Traffic Detector - VEK S4
Manual VEK S4
2 03/09 FEIG ELECTRONIC GmbH
Note
© Copyright 2009 by FEIG ELECTRONIC GmbH
Lange Straße 4
D - 35781 Weilburg
http://
www.feig.de
The specifications contained in this document may be changed without prior notice.
This edition replaces all earlier editions of the document.
The information in this guide has been compiled to the best of our knowledge and in good faith. FEIG
ELECTRONIC assumes no liability for the accuracy of the specifications in this guide. In particular FEIG
ELECTRONIC cannot be held liable for consequential damages resulting from improper installation.
Since errors can never be completely precluded in spite of all our efforts, we are always grateful for
corrections and suggestions.
The installation recommendations contained in this guide assume the most favorable circumstances. FEIG
ELECTRONIC assumes no liability for perfect function of the traffic detector in a foreign system environment.
Photocopying and reproduction of this guide in whole or in part as well as translation into other languages is
not permitted without prior written permission from FEIG ELECTRONIC. Also prohibited is storage of this
guide in whole or in part on modern storage devices for the purposes of further processing in data
processing systems.
Please read the user’s guide and safety advisories carefully and in full before starting up the traffic
detector!
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Contents
1 Functional Description ............................................................................................................................ 4
1.1 Vehicle detection................................................................................................................................. 5
1.2 Compensation..................................................................................................................................... 5
1.3 Classification of vehicles..................................................................................................................... 5
1.4 Possible outputs.................................................................................................................................. 6
1.5 Multiplexing methods .......................................................................................................................... 6
1.6 Synchronisation................................................................................................................................... 6
2 Settings ..................................................................................................................................................... 8
2.1 Frequency selection............................................................................................................................ 8
2.2 Multiplexing sequence......................................................................................................................... 8
2.3 Classification....................................................................................................................................... 8
2.4 Output modes.................................................................................................................................... 10
2.5 Time response of the output signals................................................................................................. 10
2.6 RS485 interface ................................................................................................................................ 11
2.7 CANopen interface............................................................................................................................ 11
3 Starting up............................................................................................................................................... 12
4 Display and Operation...........................................................................................................................14
4.1 Display elements............................................................................................................................... 14
4.2 (M)ode button.................................................................................................................................... 14
4.3 Factory settings................................................................................................................................. 15
4.4 Synchronisation display .................................................................................................................... 16
4.5 DIP switches ..................................................................................................................................... 16
5 Case......................................................................................................................................................... 18
5.1 Dimensions ....................................................................................................................................... 18
5.2 Opening the case.............................................................................................................................. 19
6 Technical data......................................................................................................................................... 20
7 Connector and pin assignment ............................................................................................................ 21
7.1 Power supply and interface screwless terminals.............................................................................. 21
7.2 Loop connections.............................................................................................................................. 22
7.3 2x5-pole pin connector for ribbon cables.......................................................................................... 22
7.4 Outputs.............................................................................................................................................. 22
7.5 PE connection................................................................................................................................... 22
8 Standard equipment, accessories........................................................................................................ 23
8.1 VEK M4D – connection kit ................................................................................................................ 23
8.2 VEK M4D accessories, 10 screwless terminals................................................................................ 23
8.3 Service software................................................................................................................................ 23
9 Safety instructions and warnings......................................................................................................... 24
10 4-channel functions ............................................................................................................................... 25
10.1 Scanning speed (4Ch) ...................................................................................................................... 25
10.2 Response sensitivity (4Ch)...............................................................................................................25
10.3 Hysteresis drop (4Ch)....................................................................................................................... 26
10.4 Holding time (4Ch)............................................................................................................................27
10.5 Direction recognition (4Ch)...............................................................................................................28
11 Notes........................................................................................................................................................ 36
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1 Functional Description
The VEK S4 traffic detector is a dual system for the inductive detection of vehicles. Information about the
speed, length and class of a vehicle can be provided using the measuring system (two loop principle) and its
evaluation. The data determined in this way are compiled in a report and provided to a higher level system
(host computer) for further evaluation.
Features:
• 4-channel induction loop detector
• two classification modules (for vehicle classification of, e.g. two lanes)
• automatic speed and length measurement
• vehicle classification in 8+1 classes according to TLS guidelines 2002
• vehicle detection and classification in both directions
• recording of the net time gap (time distance between two vehicles)
• loop dimensions according to TLS guidelines
1
• signal output can be adjusted using Open Drain in the case of excessive speed
• automatic adjustment of the system after switching on
• continuous readjustment of frequency drifts for largely eliminating environmental influences
• sensitivity independent from the loop inductance
• frequency band adjustment
• long loop supply lines possible (up to 300 m)
• simple installation using ribbon cable connection
• RS485 interface
• 4 Open Drain outputs
Other features:
• compact plastic case, mounting on DIN rail
• avoidance of reciprocal influencing of the channels using multiplexing methods
• avoidance of reciprocal influencing of several detectors using synchronisation
• LED display of the loop conditions
• insulation between loop and electronics
• gas surge arrester for improved surge resistance
• CANopen Interface
Setting options:
• five fixed frequency bands independent from the loop inductance
• head gap of the loops per classification module
• sensitivity adjustment of the loop pair per classification module
• adjustment of the vehicle length per classification module
• classification modules can be disconnected by deactivating the detector channels
• output can be set as presence signal, direction signal or general fault indicator, signal for excessive
speed, class-selective signal output
• hardware addresses 2 x (0-15) can be set using DIP switch and address offset via RS485 interface
• other setting options (4-channel functions) actuation threshold per channel in 256 stages
• hysteresis drop of 20-80% per channel
• holding time 1-255 minutes and indefinite per channel
• scanning speed
• direction logic
Compatibility
• downwards compatible to the TLS and FEIG protocol of the VEK S3-1
1
The publisher of the TLS (Technical delivery conditions for route stations) is the Federal Highway Research Institute
(BASt), Bergisch Gladbach
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1.1 Vehicle detection
It is established using an LC oscillator whether a metallic vehicle is in the loop area. The output of the
channel is switched depending on the selected output function.
Loop head gap and loop length are freely selectable and adjustable (see 6 Technical data ). The optimum
loop position must be determined with appropriate measuring methods for laying the loops over reinforced
roadbeds. The laying recommendations must be observed. It is recommended to use the widespread loop
geometry according to TLS II.
1.2 Compensation
A calibration is performed each time the detector is powered up or by pressing the button for longer than 1 s.
After a power interruption, automatic calibration is performed only if the supply voltage was absent for at
least 0.5 s. The calibration time is approx. 1 s if during this time no vehicles have passed through the loop.
Longer calibration times are caused by frequency instabilities; their causes must be determined and
remedied.
1.3 Classification of vehicles
The VEK S4 detector has two classification modules for the vehicle recording. These can be parameterised
independently from each other.
1.3.1 Vehicle data
The typical frequency change for vehicles and its time course on two induction loops with known geometric
dimensions are used for deriving the following factors:
• vehicle class
• vehicle speed
• vehicle length
• net time gap between the vehicles
• occupied time of the loops
• travel direction
The vehicles are classified in 8+1 classes according to TLS guidelines 2002:
• car
• car with trailer
• truck
• truck with trailer
• van
• bus
• motorcycle
• articulated vehicle
• non-classifiable vehicles, e.g. lane changers
1.3.2 Traffic Jam Detection
The detector signals a traffic jam if the traffic is flowing too slowly <10km/h. In this state, a dummy vehicle
with (Other, l = 4.0 m, v = 5 km/h) is reported. Every individual vehicle is also recognised and reported for
traffic queues if the gap between the vehicles enables both loops. The jam signal will be reset when both
loops become free.
Note: A correct detection of driving direction is not guaranteed for all traffic jam situations.
1.3.3 Recording in the case of loop fault
Speed and length measurement and classification is not possible in the case of a defective loop. A dummy
vehicle (Other, l = 4.0 m, v = 0 km/h) is reported for every vehicle which crosses the intact loop in the case of
loop malfunction.
Note: A loop fault is not reported if one or both loops have been intentionally deactivated as the classification
module concerned in this case is completely switched off.
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1.3.4 Tailgating
If a vehicle is driving to close to the car in front a dummy vehicle (Other, l = 4.5 m, v= last vehicle) is reported
with the vehicle speed of the car in front.
Note: A correct detection of driving direction is not guaranteed for all tailgating situations.
1.4 Possible outputs
Two Open Drain outputs each are assigned to every classification module. One of the functions listed below
can also be assigned to each output:
- no function (output deactivated)
- presence of a vehicle on the loops
- direction pulse signal
- pulse for vehicle crossing with vehicle class selection
- exceeding speed limit with vehicle class selection
- speed limit compliance with vehicle class selection
The function setting is made via the serial port using PC / Laptop with service program or host computer.
1.5 Multiplexing methods
The connected induction loops are switched on and off in rapid sequence, so that current flows only through
one loop at a time. This prevents mutual interference between the loops of a detector. All loops connected to
a detector can thus operate at the same loop frequency.
Kls-
modul 2
Kls-
modul 1
VEK S4
Time window 1
1 2 3 4
Inductance loops at a detector
1
2
3 4
1 2 3 4
1 2 3 4
Time window 2
T
ime window 3
Time window 4
1.6 Synchronisation
To prevent mutual interference between induction loops of multiple detectors, the latter can be synchronized
with each other using a connection in the front-side ribbon cable. All detectors connected via the
synchronous line process the multiplexing sequence synchronously. Only loops which are active in the same
time window can affect each other. Assigning the loops to the time windows is done by setting the multiplex
sequence.
Note:
• Adjacent loops should be assigned to different time windows.
• Loops in the same time window should be located physically as far away from each other as possible.
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1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
VEK M4D
Induction loops on
multiple detectors
a) Example without synchronization:
Loop 2 of Detector Nr. 3 can in the
worst case affect all the loops of
Detectors 1,2,4 and themselves be
affected by these loops.
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
VEK M4D
Induction loops on
multiple detectors
b) Example with synchronization:
Loop 2 of Detector No. 3 can in the
worst case only affect loops in the same
time window of detectors 1,2,4 or be
affected by these loops.
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2 Settings
The settings described in the following are performed either on the RS485 interface or the CAN interface. It
is recommended that the system be equipped with an operating unit for setting the detectors. The settings
can also be made from a laptop. Setup programs are available from FEIG ELECTRONIC. An appropriate
interface converter is also required.
2.1 Frequency selection
The working frequency is set in order to prevent cross-coupling.
Cross-coupling may occur with adjacent loops or loop lines on other detectors. It is therefore important that
two or more detectors do not operate on the same frequency. A frequency separation of at least 10 kHz
should be maintained for neighboring loops which are not connected to the same detector.
The detector operates in five frequency bands:
Band Frequency range
0 automatic frequency setting (Factory default setting)
1 30 - 40 kHz
2 45 - 55 kHz
3 60 - 75 kHz
4 80 - 100 kHz
5 105 - 140 kHz
It is recommended that all four loops of one detector be set to the same frequency band. Multiplexing
prevents cross-coupling between the 4 loops of a detector.
Note:
For loops whose inductance lies outside the recommended range (see Section 6 Technical data), the
frequency band setting can be restricted. The detector may calibrate to a different frequency than shown in
the above table. This is not a problem as long as there is no cross-coupling with other loops. The currently
set frequencies should therefore be checked.
For long loop supply lines it is recommended to use band 2..4 for frequency setting.
If automatic frequency setting is activated, the VEK S4 uses the device address to choose one of the
frequency range above. Please check the real frequency, because it can differ from the nominal frequency.
For additional notes on preventing cross-coupling Æ see Section 1.6 Synchronisation
2.2 Multiplexing sequence
The default multiplexing sequence is 1-2-3-4. To prevent cross-coupling with neighboring loops of another
detector in exceptional cases, you may change the sequence (e.g. 1-4-2-3). Æ see also Section 1.6
Synchronisation
2.3 Classification
Both classification modules of the VEK S4 detector have separate loop parameters so that relevant
parameters per classification module can be set for the vehicle recording. The loop parameters include the
head gap, the amplitude factor for the sensitivity, the constant for the length adjustment and the loop length.
• Head gap
The correct setting of the head gap is relevant for the accuracy of the speed measurement and the vehicle
length.
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• Amplitude factor
The loss of sensitivity due to abnormal loop dimensions, long loop lines or road surface reinforcements is
largely compensated for using the amplitude factor. Automatic evaluation of this factor is also available.
• Length adjustment
The measured vehicle length is corrected with the length adjustment. No vehicle length adjustment is usually
required for normal loops according to TLS with loop lines up to 100 metres.
• Loop length
The loop type of the connected loops is adjusted using the loop length. Currently only the loop types TLS I
and TLS II according to the TLS 2002 guidelines are supported. The loop type TLS II is assumed for a length
up to 125 cm. The loop type TLS I is set for lengths of more than 125 cm.
loop
llenght
Kopfabstand
loop 3
loop 4
loop 1
loop 2
Classifaction-
modul 1
Classifaction-
modul 2
Signals
OpenCollector 3
Counter ever class
and directoin
OpenCollector 4
OpenCollector 1
OpenCollector 2
Loop allocation
is firm
Counter ever class
ans direction
Augangszuordnung
is firm
• Output signals
As already described in 1.4 Possible outputs, each classification module can control two outputs. Refer to
the diagram above for their assignment. One of the five available functions can be set for each output.
Outputs can also be deactivated.
• Vehicle counter
Each classification module has a 16-bit counter per vehicle class and travel direction which can be invoked
via the RS485 interface. It must be noted that the counters roll over at 65535 (2
16
) and restart from 0. It is not
recommended to reset the counters otherwise vehicles can be lost at the time of the reset. The counters in
the detector are not protected against power failure. The detectors must either be buffered with a UPS
system or the counter readings must be regularly read and stored in the higher level system for long-term
counting.
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2.4 Output modes
The following output modes can be set for the four open collector outputs:
Output mode Description
Standard output Normal output mode for presence or direction detection
Group fault message Output indicates loop faults from all loops
always off Output always turned off
always on Output always turned on
Simulation Output switches constantly, e.g. for testing purposes
Inverted or non-inverted signal output can be selected for all output modes.
In the case of standard output the loop faults of the respective channel can be output together with the
logical signal. Which fault is additionally indicated can be set to loop fault (break/short), loop frequency
outside frequency band and calibration procedure.
Factory default setting: Standard output,
Signals not inverted,
Respond to loop fault
The interface can be used to temporarily turn the outputs on or off. This allows you to implement control
tasks such as controlling traffic lights or variable message signs.
In simulation mode the output is constantly repeated according to the following scheme:
- The signal duration corresponds to the set minimum on duration
- The pause time corresponds to the set on delay. If no on-delay is set (0 ms), an idle time of 20s is
assumed.
For the factory set time behavior of the output signals this means a pulse signal of 200 ms duration and an
idle time of 20 s.
2.5 Time response of the output signals
On-delay, minimum on duration and off-delay for the hardware output signals can be set in 100 ms
increments over a range of 0...25500ms.
Factory default setting: On-delay 0 ms
Off-delay 0 ms
Minimum on duration 200 ms
Loop busy
Output signal
t
on
td ≥ t
dmin
t
off
ton: On delay
t
off
: Off delay
t
dmin
: Minimum on duration
t
d
: Signal duration
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2.6 RS485 interface
Baud rates: 9.6, 19.2, 38.4 kbaud
Parity: no, even, odd parity
Factory default setting: 9.6 kbaud, even parity
Refer to the RS485 documentation for the VEK S4 for the specification of the interface protocols.
The VEK S4 is downwards compatible with the interface protocols defined for the VEK S3. The
protocols based on the TLS defined in the VEK S3 are also supported. In these cases, one VEK S4
behaves like two separately addressable VEK S3 units. Mixed operation of VEK S3 and VEK S4 on
a common bus is not recommended.
Default or factory setting: 100 kBit/s
2.7 CANopen interface
The CANopen standard 301 according to CiA is supported
Baud rates: 100, 125, 250, 500, 800, 1000 kbps
Refer to the CANopen documentation for the VEK S4 for the specification of the CANopen protocols.
Please look for CANopen basics in the specifications from the CiA (CAN in Automation)
organisation.
Default or factory setting: 250 kbps
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