Nortech PD130TD136 User Manual

This document is for information

only and unless otherwise indicated, is not to form part of any contract. In accordance

to alteration without notice.

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: [e-mail] URL: www.nortech.co.za

PD130 Enhanced

Vehicle Detector

User Manual

NORTECH INTERNATIONAL (PTY) LTD
All rights reserved
Copyright © 2009
Document Number: 301UM0030_01
Date of Issue: September 2009

with the manufacturer’s policy of continually updating and improving design, specifications contained herein are subject

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.....................................................................................................................................7

2.5 Approvals................................................................................................................................................8

3.

OPERATING PROCEDURE......................................................................................................................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 Automatic Sensitivity Boost...........................................................................................................10

3.2.4 Filter Mode ....................................................................................................................................10

3.2.5 Pulse Relay ...................................................................................................................................10

3.2.6 Presence Time ..............................................................................................................................10

3.2.7 Reset Switch .................................................................................................................................11

3.3 Power Fail (Option)...............................................................................................................................11

3.4 Front Panel Indicator ............................................................................................................................11

4. PRINCIPAL OF OPERATION .................................................................................................................12

4.1 Detector Tuning....................................................................................................................................12

4.2 Detector Sensitivity...............................................................................................................................12

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

6.

CONFIGURATION...................................................................................................................................18

6.1 PD131 Enhanced Detector - Order number 301FT0119 .....................................................................18

6.2 PD132 Enhanced Detector - Order number 301FT0101 .....................................................................19

6.3 PD134 Enhanced Detector - Order number 301FT0122 .....................................................................19

7.

APPLICATIONS ......................................................................................................................................20

8.

CUSTOMER FAULT ANALYSIS ............................................................................................................21

8.1 Fault Finding.........................................................................................................................................21

8.2 DU100 – Detector Diagnostic Unit ......................................................................................................22

8.3 Interpretation of DU100 Readings........................................................................................................22

8.3.1 Frequency ......................................................................................................................................................22

8.3.2 Frequency drift ..............................................................................................................................................23

8.3.3 Sensitivity......................................................................................................................................................23

8.3.4 Time ..............................................................................................................................................................23

8.3.5 Crosstalk .......................................................................................................................................................24

8.4 Functional Test.....................................................................................................................................24

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APPENDIX A - FCC ADVISORY STATEMENT ................................................................................................25

APPENDIX B – INSTALLATION OUTDOORS..................................................................................................26

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 PD130 Enhanced Vehicle Detector is a single channel microprocessor based detector designed
specifically for parking and vehicle access control applications. The PD130 Enhanced Vehicle
Detector has been designed using the most up-to-date technology in order to meet the requirements
of a vast number of parking applications (in terms of operating conditions and 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 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 PD130 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 or a loop fault.

Related Documents:

Data Sheet Document No. 301DS0010
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 µH 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

Automatic Sensitivity Boost Switch selectable
Filter Switch selectable 2 second filter
Presence Relay Fail-safe
Presence Time Switch selectable: Limited presence

Permanent presence
Pulse Relay Switch selectable: Pulse on detect

Pulse on undetect
Pulse Output Duration 150 milliseconds
Response Times 100 milliseconds
Detect Outputs Relays rated – 5 A @ 230 VAC

Optional – Opto Isolated 50mA @ 30 VDC
Drift Compensation Rate Approx. 1 %∆L/L per minute
Visual Indications 1 x Power LED - Red

1 x Channel Status LED - Green
Reset Push button on front of enclosure
Surge protection Loop isolation transformer, gas discharge tubes and Zener

diode clamping on loop input
Power Fail (Option) 10 minutes memory retention of detector state on power

failure.

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2.2 Electrical Data

Power requirements 12 V -10% to 24 V +10% (PD134)
120 V
230 VAC ± 10% (48 to 62Hz)
Requirement: 1.5 VA Maximum @ 230 V

Relay Contact Rating Relays rated – 5 A @ 230 V
Optional – Opto Isolated 50mA @ 30V

Maximum current as per graph below

2.3 Environmental Data

± 10% (48 to 62Hz)

AC

AC

DC

For ambient temperatures above 60°C De-rate the rel ay

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

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 80mm (D)

77.7 mm

80 mm

40.6 mm

75.9 mm

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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 PROCEDURE

3.1 Hardware Set-Up

The PD130 Enhanced Vehicle single channel parking detector is 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, switches No. 1 and 2. There are four frequency
selections:

SW2 SW1
Off Off High
On Off Medium-High
Off On Medium-Low
On On Low

The frequency switches allows the operating frequency of 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 cross­talk (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.

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3.2.2 Sensitivity

The sensitivity of the detector allows the detector to be selective as to the change of inductance
necessary to produce a detect. There are four sensitivity selections:

SW4 SW3
Off Off High
On Off Medium-High
Off On Medium-Low
On On Low

3.2.3 Automatic Sensitivity Boost

Automatic sensitivity boost is a mode which alters the un-detect level of the detector. This mode is
selected by Switch No. 5 on the front of the enclosure:

SW5
Off Disabled
On Enabled

Automatic sensitivity boost causes the sensitivity level to be boosted to a maximum on detection of a
vehicle, irrespective of current sensitivity level and maintained at this level during the entire presence
of the vehicle over the loop. When the vehicle leaves the loop and the detection is lost, the sensitivity
level reverts to the pre-selected level.

3.2.4 Filter Mode

The filter mode is selected with the mode Switch No. 6 shown below. The filter produces a delay turn­on time of two seconds when a vehicle occupies the loop. This is to enable small, unwanted objects to
pass over the loop without being detected. The filter option may be used on any sensitivity setting.

SW6
Off Disabled
On Enabled

3.2.5 Pulse Relay

The pulse relay may be made to operate on detect (entry) or on undetect (exit) of a vehicle. This option
is selected with Switch No. 7:

SW7
Off Pulse on Detect
On Pulse on Undetect

3.2.6 Presence Time

The presence time may be set to permanent presence or to limited presence. In permanent presence
mode the detector will continuously compensate for all environmental changes whilst there is a vehicle
present over the loop. The presence mode is set with Switch No. 8:

SW8
Off Limited Presence
On Permanent Presence

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3.2.7 Reset Switch

The detector automatically tunes to the inductive loop connected to it when the power is applied,
whether on initial installation or after any break in power supply. Should it be necessary to retune the
detector, as may be required after changing any of the switches or after moving the detector from one
installation to another, momentary operation of the RESET switch will initiate the automatic tuning
cycle.

3.3 Power Fail (Option)

The detector is able to retain the output state for a power failure of not greater than 10 minutes. Thus,
when the power is restored, the detector will not re-tune but return to the detect state prior to the
power failure. If a vehicle was on the loop during power failure, it will remain detected when power is
restored.

3.4 Front Panel Indicator

While the detector is tuning, the ON (Red) LED will glow .The OUTPUT LED (Green) will extinguish
when the system is tuned. The green LED will flash at a rate of 1 Hz during tuning. This is used to
indicate the frequency of the loop to the user. Every flash of the LED is equivalent to 10 kHz. It will
stop when the operating frequency is reached. This operation is also performed whenever the reset
button is depressed.

The ON (Red) LED will glow permanently to indicate that the unit is functional. The red LED also
serves as an optical interface to the DU100 Diagnostic Unit.

If faults exist with the loop the green LED will come on and flash off at the rate of 2Hz indicating the
fault. If the fault is self-healing the detector will continue to operate but the LED will remain on,
indicating to the user that a fault has occurred. The LED will go off for a moment during an undetect
indicating this, thereafter returning on. This condition can be restored by removing the power or by
depressing the reset button.

The green LED will also glow whenever a vehicle is detected passing over the inductive loop.

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4. PRINCIPAL OF OPERATION

The inductive loop vehicle detector senses the presence of a vehicle over an area defined by a loop of
two or more turns of wire, laid under the road or pavement surface. This loop of wire is connected to
the detector by a twisted pair of wires called a loop feeder.

A vehicle passing over a sensing loop causes a small reduction in the inductance of the loop, which is
sensed by the detector. The sensitivity of the detector is adjustable to accommodate a wide range of
vehicle types, as well as different loop and feeder combinations.

Upon detection of a vehicle passing over the loop the detector operates its output relays, which may
be used to indicate controls associated with the installation.

4.1 Detector Tuning

Tuning of the detector is fully automatic. When power is applied to the detector upon installation of the
system, or when a reset is initiated, the detector will automatically tune itself to the loop to which it is
connected. The detector will tune to any loop with an inductance in the range 20 to 1500 micro-henries
(µH).

This wide range ensures that all loop sizes and feeder combinations will be accommodated in the
tuning range of the detector.

Once tuned, any slow environmental change in loop inductance is fed to a compensating circuit within
the detector, which keeps the detector correctly tuned.

4.2 Detector Sensitivity

Sensitivity of the detection system is dependent on factors such as loop size, number of turns in the
loop, feeder length and the presence of metal reinforcing beneath the loop.

The nature of the application determines the required sensitivity, which may be adjusted by means of
the sensitivity switches on the front of the enclosure.

Sensitivity levels of the PD130 Enhanced Vehicle Detector have been carefully optimised for parking
and vehicle access control applications. The detection of small unwanted objects such as bicycles and
trolleys can be eliminated by selecting lower sensitivity levels whilst high-bed vehicles and
vehicle/trailer combinations will not lose detection by using A

utomatic Sensitivity Boost (ASB) option.

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ASB operates as follows: When ASB is disabled, the un-detect level is dependent on
the sensitivity setting of the detector. Hence as the detector is made less sensitive, the un-detect level
will reduce accordingly. When the ASB is enabled the un-detect level is fixed irrespective of the
sensitivity setting and will be equivalent to the un-detect level when the sensitivity is on maximum
setting.

4.3 Modes of Operation

In the presence mode the detector will give a continuous output during the presence of a vehicle over
the inductive loop. As the detector is designed with the permanent presence feature, the detector will
indicate vehicle presence for an unlimited period of time. If the permanent presence is not selected,
then the detect time will be dependent on the change of inductance. The presence time on the limited
presence setting will be approximately 1 hour for 3% ∆ L/L.

The pulse relay outputs a pulse of 150 milliseconds duration. When set to “pulse on detect” the
detector will give a pulse on detection of a vehicle. When set to “pulse on un-detect” the detector will
give a pulse output when the vehicle leaves the loop.

The presence output is known as a fail-safe output. This implies that in the event of a power failure the
detector will give a detect output. The pulse outputs are not fail safe and will not operate if a failure
occurs.

4.4 Response Times

The response time of the detector is the time taken from when a vehicle moves over the loop to when
the detector gives an output.

The response times of the PD130 Enhanced Vehicle Detector has been adjusted to prevent false
operation in electrically noisy environments, but retain adequate response to vehicles in parking and
vehicle access control applications.

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5. INSTALLATION GUIDE

Optimum functioning of the detector module is largely dependent on factors associated with the
inductive sensor loop connected to it. These factors include choice of material, loop configuration and
correct installation practice. A successful inductive loop vehicle detection system can be achieved
bearing the following constraints in mind, and strictly following the installation instructions. The detector
must be installed in a convenient weatherproof location as close as possible to the loop.

5.1 Product Safety Requirements

• WARNING: The unit must be EARTHED.

• WARNING: Disconnect the power before working on the unit.

• WARNING: On 120 VAC and 230 VAC models a readily accessible disconnect device

must be incorporated into the mains wiring (as per EN60950 Section 1.7.2).

• WARNING: On all models the power supply to the unit MUST have short circuit protection
and over current protection installed at the power supply source (As per EN
60950 section 1.7.11). Typically this will be a 5 Amp Magnetic Circuit Breaker
for AC models and a fuse for DC models.

• WARNING: This product must be installed in an enclosure as the IP rating of the detector
is IP 30.

• WARNING: No user serviceable parts inside. Warranty void if cover removed.
ONLY SERVICE PERSONNEL MAY OPEN THE UNIT TO CHANGE THE
INTERNAL SETTINGS.

• WARNING: Only use CE approved 11 pin relay bases such as Nortech Part No.
CTR119090 or equivalent.

As an alternative to the 11 pin relay base, Nortech has a 11 pin wiring
harness, Nortech Part No. 301FT0041, which can only be used in SELV
voltage (less than 60 VDC or less than 42 VAC) applications.

5.2 Operational Constraints

5.2.1 Environmental Factors to Consider

Even though the PD130 Enhanced Vehicle parking detectors are housed, the system integrator MUST
ensure that the detector is installed in a housing/fire enclosure to protect it from the environment.

The PD130 Enhanced Vehicle parking detectors are rated to operate over the industrial temperature
range but the rate of temperature change MUST not exceed 1°C per minute. This system integrator
MUST ensure that the housing used complies with this rate of temperature change requirement.

For installation Outdoors refer to Appendix B.
For additional information on Environmental Factors refer to the section “Environmental Influences

to Design Parameters” in the “Loops and Loop Installations” Manual, Nortech Document No. MKT05.

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5.2.2 Crosstalk

When two loop configurations are in close proximity, the magnetic fields of one can overlap and disturb
the field of the other. This phenomenon, known as crosstalk, can cause false detects and detector
lock-up.

Crosstalk between adjacent loops operating from different detector modules can be eliminated by:

1. Careful choice of operating frequency. The closer together the two loops, the further apart the
frequencies of operation must be.

2. Separation between adjacent loops. Where possible a minimum spacing of 2 metres between
loops should be adhered to.

3. Careful screening of feeder cables if they are routed together with other electric cables. The
screen must be earthed at the detector end only.

4. Running feeder cables in their own slots, separated by at least 300mm
For additional information on Crosstalk refer to the section “Crosstalk Prevention” in the

DU100 Diagnostic Unit User Manual Nortech Document No. 895UM0001.

5.2.3 Reinforcing

The existence of reinforced steel below the road surface has the effect of reducing the inductance,
and therefore the sensitivity, of the loop detection system. Hence, where reinforcing exists 2 turns
should be added to the normal loop, as referred to in section 5.4.

The spacing between the loop and steel reinforcing should be greater than 150 mm, although this is
not always practically possible. The slot depth should be kept as shallow as possible, taking care that
the feeder remains exposed after the sealing compound has been applied.

5.3 Loop and Feeder Specification

Extensive studies have been undertaken over the years by various agencies around the world in order
to ascertain the optimum loop installation materials.

As an insulated conductor is a prerequisite, PVC covered cable has been used for many years as a
first choice, but tests have shown, in fact, that this is unsuitable for long term installations. The PVC
tends to become porous with the result that adjacent loops become electrically coupled to one
another, with resultant crosstalk implications. Instability and susceptibility to electrical interference can
also result.

The insulation must withstand wear and abrasion from the shifting streets, moisture, and attack by
solvents and oils, as well as withstand the heat of high temperature sealants.

Silicone insulated cable has emerged as one of the preferred insulation materials. Other insulation
materials are rubber, thermoplastic, synthetic polymer and cross linked polyethylene.

Stranded loop wire is preferred over solid wire. Because of its mechanical characteristics, a stranded
wire is more likely to survive bending and stretching than a solid.

A heavy gauge conductor is definitely desirous in order to maintain the loop Q-factor. The loop and
feeder should preferably constitute a single length of insulated multi-stranded copper conductor, with
no joints and with the copper having a minimum cross section 1.5 mm2. The feeder is twisted to
minimise the effect of electrical noise.

Joints in the loop or feeder are not recommended. Where this is not possible, joints are to be soldered
and terminated in a waterproof junction box. This is extremely important for reliable detector
performance. Other forms of joins such as those available in kits, where the joint is properly sealed
against moisture, are also permitted.

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5.4 Sensing Loop Geometry

NOTE: 1) The circumference of the loop must not exceed 30 m.

2) The area of the loop must not exceed 30 m² and must not be less than 1 m².

3) The loop must be constructed as detailed below.

Sensing loops should, unless site conditions prohibit, be rectangular in shape and should normally be
installed with the longest sides at right angle to the direction of traffic movement. These sides should
ideally be 1 metre apart.

The length of the loop will be determined by the width of the roadway to be monitored. The loop should
reach to within 300mm of each edge of the roadway.

In general, loops having a circumference measurement in excess of 10 metres should be installed
using two turns of wire, while loops of less than 10 metres in circumference, should have three turns
or more. Loops having a circumference measurement less than 6 metres should have four turns. It is
good practice at time of installation to construct adjacent loops with alternate three and four turn
windings.

For additional Information on loop geometry refer to the following documents:

• “INDUCTIVE LOOP VEHICLE DETECTION” - Nortech Doc. No. MKT01.

• “TRAFFIC DETECTION CONCEPTS” - Nortech Doc. No. MKT02.

• “PARKING APPLICATION MANUAL” – Nortech Doc. No. MKT03

5.5 Loop Installation

All permanent loop installations should be installed in the roadway by cutting slots with a masonry
cutting disc or similar device. A 45° crosscut shou ld be made across the loop corners to reduce the
chance of damage that can be caused to the loop at right angle corners.

NOMINAL SLOT WIDTH: 4 mm
NOMINAL SLOT DEPTH : 30 mm TO 50 mm

A slot must also be cut from the loop circumference at one corner of the loop, leading to the roadway
edge to accommodate the feeder.

A continuous loop and feeder is obtained by leaving a tail long enough to reach the detector before
inserting the cable into the loop slot. Once the required number of turns of wire are wound into the slot
around the loop circumference, the wire is routed again via the feeder slot to the roadway edge. A
similar length is allowed to reach the detector and these two free ends are twisted together to ensure
they remain in close proximity to one another. (Minimum 20 turns per metre) Maximum recommended
feeder length is 100 metres. It should be noted that the loop sensitivity decreases as the feeder length
increases, so ideally the feeder cable should be kept as short as possible.

The loops are sealed using a “quick-set” black epoxy compound or hot bitumen mastic to blend with
the roadway surface.

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300mm

+/- 2 m Depending on Road Width

SAW CUTS

MIN DISTANCE APART -

MAX DISTANCE APART -

-

-

2 m (Road Width = 2 m)

3 m (Road Width = 4 m)

No Limit

300mm

m
1

m
1

CURB/ROAD
EDGE

45° CROSSCUT TO PROVIDE STRESS RELIEF

TRAFFIC DIRECTION

Figure 5.1 Adjacent loops connected to different detector modules

Figure 5.2 Slot Details

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6. CONFIGURATION

WARNING: 8. The connector PIN assignments vary from model

to model. Refer to the label on the side of the unit
for connector PIN assignment.

NOTE 1: The tables below show the PIN assignments for Nortech’s standard PD130 Enhanced

models. On other models the pin assignments may change.

WARNING: 9. The wiring harness is only rated for SELV

voltages (less than 60Vdc or less than 42Vac).
If the relays are to switch higher voltages use

CE LVD approved 11 pin sockets

NOTE 2: All relay contact descriptions refer to the tuned and undetected state.

6.1 PD131 Enhanced Detector - Order number 301FT0119

11-pin connector wiring for PD131 DETECTOR - Order number 301FT0119

301FT0045
Wiring Harness
Wire COLOUR

Red 1 Live
Black 2 Neutral
Grey 3 Pulse Relay N/O
Green 4 Earth
Brown 5 Presence Relay N/O
Yellow 6 Presence Relay Common
Blue 7 Loop
White 8 Loop
Violet 9 Pulse Relay Common
Pink 10 Presence Relay N/C
Orange 11 Pulse Relay N/C

11 PIN
Connector
Pin No.

FUNCTION

Power supply
120V 10% 50/60 Hz

Twist this
Pair

WARNING: 10. The wiring harness wire colour to PIN No.

assignment only applies to wiring harness Part
No. 301FT0045. Other wiring harnesses will have
different wire colour to PIN No. assignments.

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