Nortech TD136 User manual

Nortech International (Pty) Ltd
PO Box 4099 32A Wiganthorpe Road
Willowton Hub Pietermaritzburg
Pietermaritzburg 3201 South Africa
3200 South Africa Reg. No: 98/1095
Tel: [phone] Int. Tel: [phone]
Fax: [phone] Int. Fax: [phone]
Email: [email protected] URL: www.nortech.co.za
TD136 Enhanced
Vehicle Detector
User Manual
Nortech International (Pty) Ltd
All rights reserved
Copyright © 2009
Document Number: 301UM0031_01
Date of Issue: September 2009
This document is for information only and unless otherwise indicated, is not to form part of any contract. In accordance
with the manufacturer’s policy of continually updating and improving design, specifications contained herein are subject
to alteration without notice.
APPROVALS
Originator: Unknown updated: K. Mbatha
Checked: ______________________________ Date: __________________
Engineering Manager: _____________________________
Approved: ______________________________ Date: __________________
Marketing: ____________________________
Checked and approved: ______________________________ Date: __________________
Date: dd/mm/yy Rev CRN No.
19/09/2009 00 2378
19/09/2009 01 2378

Nortech International (Pty) Ltd
PO Box 4099 32A Wiganthorpe Road
Willowton Hub Pietermaritzburg
Pietermaritzburg 3201 South Africa
3200 South Africa Reg. No: 98/1095
Tel: [phone] Int. Tel: [phone]
Fax: [phone] Int. Fax: [phone]
Email: [email protected] URL: www.nortech.co.za
TD136 Enhanced
Vehicle Detector
User Manual
Nortech International (Pty) Ltd
All rights reserved
Copyright © 2009
Document Number: 301UM0031_01
Date of Issue: September 2009
This document is for information only and unless otherwise indicated, is not to form part of any contract. In accordance
with the manufacturer’s policy of continually updating and improving design, specifications contained herein are subject
to alteration without notice.

301UM0031_01 TD136 Enhanced Vehicle Detector User Manual Page: 2 of 29
Table of Contents
1. INTRODUCTION.................................................................................................................................... 5
2. TECHNICAL DATA................................................................................................................................ 6
2.1 Functional Data................................................................................................................................... 6
2.2 Electrical Data..................................................................................................................................... 7
2.3 Environmental Data ............................................................................................................................ 7
2.4 Mechanical Data................................................................................................................................. 8
2.5 Approvals............................................................................................................................................ 8
3. OPERATING INSTRUCTIONS .............................................................................................................. 9
3.1 Hardware Set-up................................................................................................................................. 9
3.2 Switch Setting Selections.................................................................................................................... 9
3.2.1 Frequency Switch ........................................................................................................................ 9
3.2.2 Sensitivity................................................................................................................................... 10
3.2.3 Presence Time........................................................................................................................... 10
3.2.4 Delay Time................................................................................................................................. 11
3.2.5 Reset Switch.............................................................................................................................. 11
3.3 Front Panel Indicator......................................................................................................................... 11
4. PRINCIPAL OF OPERATION.............................................................................................................. 12
4.1 Detector Tuning ................................................................................................................................ 12
4.2 Detector Sensitivity........................................................................................................................... 13
4.3 Modes of Operation .......................................................................................................................... 13
4.4 Response Times............................................................................................................................... 13
5. INSTALLATION GUIDE....................................................................................................................... 14
5.1 Product Safety Requirements ........................................................................................................... 14
5.2 Operational Constraints .................................................................................................................... 14
5.2.1 Environmental Factors to Consider............................................................................................ 14
5.2.2 Crosstalk.................................................................................................................................... 15
5.2.3 Reinforcing................................................................................................................................. 15
5.3 Loop and Feeder Specification.......................................................................................................... 15
5.4 Sensing Loop Geometry ................................................................................................................... 16
5.5 Loop Installation................................................................................................................................ 16
6CONFIGURATION................................................................................................................................... 18
6.1 TD136 Enhanced – 120 V
AC
Vehicle Detector - Order number 305FT0004...................................... 18
6.2 TD136 Enhanced – 230 V
AC
Vehicle Detector - Order number 305FT0001...................................... 19
6.3 TD136 Enhanced – 12 to 24 V
AC/DC
Vehicle Detector - Order number 305FT0010 ........................... 19
7. APPLICATIONS................................................................................................................................... 20
8. CUSTOMER FAULT ANALYSIS ......................................................................................................... 21
8.1 Fault Finding..................................................................................................................................... 21
8.2 DU100 – DETECTOR DIAGNOSTIC UNIT....................................................................................... 22
8.2.1 Interpretation of DU100 readings............................................................................................... 22
8.2.1.1 Frequency........................................................................................................................................................22
8.2.1.2 Frequency drift...............................................................................................................................................23
8.2.1.3 Sensitivity.......................................................................................................................................................23
8.2.1.4 Time...............................................................................................................................................................23
8.2.1.5 Crosstalk........................................................................................................................................................24
8.3 Functional Test ................................................................................................................................. 24
APPENDIX A - FCC ADVISORY STATEMENT.............................................................................................. 25
APPENDIX B – INSTALLATION OUTDOORS............................................................................................... 26

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Appendix B.1 IEC 60950-22:2005 – Outdoor cabinet............................................................................... 26
Appendix B.2 IEC 60950-22:2005 - Northern Europe............................................................................... 26
Appendix B.3 IEC 60950-1:2005 – Overvoltage Category........................................................................ 26
APPENDIX C –REQUEST FOR TECHNICAL SUPPORT FORM................................................................... 27

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WARNING: 1. This unit must be earthed!
WARNING: 2. Disconnect power before working on this unit!
WARNING: 3. Installation and operation by service personnel only!
WARNING: 4. No user serviceable parts inside. Only service personnel
may open the unit to change internal settings. Warranty
void if cover removed !
WARNING: 5. Always suspend traffic through the barrier area during
installation and testing that may result in unexpected
operation of the barrier.
WARNING: 6. USA
FCC Advisory Statement – Refer to Appendix A at the
end of this document.
WARNING: 7. Europe
Disposing of the product:
This electronic product is subject to
the EU Directive 2002/96/EC for
Waste Electrical and Electronic
Equipment (WEEE). As such, this
product must not be disposed of at
a local municipal waste collection
point. Please refer to local
regulations for directions on how to
dispose of this product in an
environmental friendly manner.

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1. INTRODUCTION
The TD136 Enhanced Vehicle Detector is a single channel microprocessor based detector designed
specifically for traffic control applications. The TD136 Enhanced Vehicle Detector has been designed using the
most up-to-date technology in order to meet the requirements of a vast number of traffic applications in terms
of operating conditions and functional options available to the user.
The primary function of the detector is to detect vehicle presence by means of an inductance change caused
by the vehicle passing over a wire loop buried under the road surface. The detector has been designed for
ease of installation and convenience.
The detector has been designed for ease of installation and convenience. The various modes are selected by
changing the positions of the switch on the front of the unit.
The switches allow for different loop frequency settings, sensitivity settings and mode settings.
The TD136 Enhanced Vehicle Detector provides visual output (LED) on the front of the enclosure and relay
change-over contacts are taken on the 11 pin connector at the rear of the enclosure. The LED indicates the
power has been applied to the unit, that a vehicle is present over the loop and if there is a fault on the loop.
The Presence relay is fail-safe and will close on a vehicle detect or in the event of power failure. The TD136
Enhanced Vehicle Detector is also provided with an integral fault relay, which will provide an output in the
event of a loop fault condition.
Related Documents:
TD136 Enhanced Vehicle Detector Data Sheet Document No. 305DS0002
Installation Leaflet Document No. 300LF0006
Diagnostic Unit DU100 User Manual Document No. 895UM0001

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2. TECHNICAL DATA
2.1 Functional Data
Tuning Fully Automatic
Self-tuning range 20 to 1500 µH
Sensitivity Four step switch selectable
High 0.02 %∆L/L
Medium High 0.05 %∆L/L
Medium Low 0.10 %∆L/L
Low 0.50 %∆L/L
Frequency Four step switch selectable
Frequency dependent on loop size
Relay Outputs Presence Relay
Fault Relay
Presence Relay Fail-safe
Presence Time Switch selectable:
1 Second
4 Minutes
40 Minutes
No fixed time-out (dependant on inductance change) Approx.
1 hour for 3 %∆L/L
Delay Time Switch selectable:
0 Seconds
10 Seconds
20 Seconds
30 Seconds
Fault Output Separate fault monitor output relay
Operates under the following conditions:
1. Loop open/short circuit
2. Detector/power fault
Response Times Turn – on 60 milliseconds
Turn – off 60 milliseconds
Drift Compensation Rate Approx. 1 %∆L/L per minute
Visual Indications 1 X Power LED - Red
1 x Channel Status LED - Green
Reset Reset by push button on front of enclosure
Surge protection Loop isolation transformer, gas discharge tubes, and Zener
Diode clamping on loop input

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2.2 Electrical Data
Power requirements 12 V -10% to 24 V +10% DC/AC 48 to 62 Hz
120 V
AC
±10% (48 to 62 Hz)
230 V
AC
±10 % (48 to 62 Hz)
Requirement: 1.5 VA Maximum @ 230 V
Relay Contact Rating Relays rated – 5 A @ 230 V
AC
Optional – Opto Isolated 50mA @ 30V
DC
For ambient temperatures above 60°C De-rate the relay
Maximum current as per graph below
2.3 Environmental Data
Storage Temperature -40°C to +80°C
Operating Temperature -40°C to +70°C
Humidity Up to 95% relative humidity without condensation
Circuit protection Conformal coating over the PCB and all components
IP Rating IP30

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2.4 Mechanical Data
Housing Material ABS blend
Mounting Position Shelf or DIN rail mounting
Connections 11-pin Submagnal (JEDEC No. B11-88)
Size of Housing 78mm (H) X 41mm (W) X 78mm (D)
80 mm
75.9 mm 77.7 mm
40.6 mm
2.5 Approvals
CE Regulations: EN 301 489-3 Equipment Type: III Class of Equipment: 2
EN 50293 Performance Criteria B
Safety IEC / EN 60950-1

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3. OPERATING INSTRUCTIONS
3.1 Hardware Set-up
The TD136 Enhanced Vehicle Detector is a single channel traffic detector designed to be shelf or DIN
rail mounted with the controls and visual indicators at the front and wiring at the rear of the enclosure.
The power, loop and relay outputs are all connected to the single 11-pin plug, which is mounted at the
rear of the enclosure.
3.2 Switch Setting Selections
3.2.1 Frequency Switch
The frequency switches are the lower two switches, numbered 1 and 2. There are four frequency
selections and are set out as follows:
SW2
SW1
Off
Off
High
On
Off
Medium
-
High
Off
On
Medium
-
Low
On
On
Low
The frequency switches allows the loop to be shifted higher or lower depending on the switch position.
The frequency of the loop is determined by the loop size, and the frequency of the switch simply
causes a frequency shift on the loop.
Where more than one detector is used the detectors must be set-up to ensure that there is no cross-
talk (interference) between the detectors. This can be achieved by ensuring that the loops of the two
detectors are spaced sufficiently apart (approximately 2 metres between adjacent edges) and also
ensuring that the detectors are set to different frequencies.
As a general rule, the detector connected to the inductive loop with the greatest inductance should be
set to operate at the lowest frequency. Loop inductance increases as loop size, number of turns in the
loop and feeder length increases.