RDS TGSS MK3V Use and care manual

TGSS MK3V RADAR SENSOR
K/TGSS/MK3V and K/TGSS/ADAPT
Installation and Calibration Instructions
Doc. No. S/DC/500-10-702 : Issue 4 -2.8.12 Page 1UK702400.DOC
1
2
4
5
6
7
8
3
Introduction
The RDS True Ground Speed Sensor provides a forward speed signal for use with any of the range of RDS
instruments or to any other control or logging system. The sensor can be used on agricultural vehicles, on-road
vehicles, rail vehicles, and can be used over almost any surface (except a perfectly smooth, reflecting surface).
The sensor is classed as a "Low Power Microwave Device" operating at 24.125 GHz producing 5mW of power.
This meets performance specification MPT 1349 and complies with The Wireless Telegraphy (Exemption)
Regulations 1991 (S1 1991/1523). No operators Licence is required.
Kit Contents
The kit contains the following components ("#" -part not illustrated).
Item Part Number Description Qty
1S/SR/168-13-003 Mk3V Radar Sensor 24.125 GHz (Standard Weatherpack) 1
2S/BK/168-12-010 Mk3P/Mk3V Radar Sensor Bracket 1
3S/FR/500-6-070 M6 x 12 Hex Set Screw 3
4S/FSNR/301 M6 Spring Washer 3
5S/F715-004 M6 Plain Washer 3
6S/FSNR/940122 M8 x 45 Hex. Set Screw 2
7S/FR/500-5-006 M8 Plain Washer 2
87 S/FSNR/407 M8 Nyloc Nut 2
#S/CB/220-1-002 Extension lead 1
#S/DC/500-10-702 Instruction leaflet 1
#S/DC/500-10-704 Self-adhesive Mounting Template 1
Figure 1
Mounting Adaptor Kit -K/ TGSS/ADAPT (optional)
Item Part Number Description Qty
1S/BK/168-13-005 Adaptor Plate 1
2S/FR/500-6-071 M6 x 10 Socket Countersink Head Screw 3
3S/FR/500-6-055 M10 x 35 Hex. Set Screw 3
4S/FSNR/227 M10 Nyloc Nut 3

TGSS MK3V RADAR SENSOR
K/TGSS/MK3V and K/TGSS/ADAPT
Installation and Calibration Instructions
Doc. No. S/DC/500-10-702 : Issue 4 -2.8.12 Page 2UK702400.DOC
Installation
The sensor can be mounted directly to the vehicle chassis, or on its mounting bracket, so that it is pointing at a
depression angle of 37 degrees (± 2 degrees) from the horizontal. This angle is critical to the accuracy of the
instrument (but also see note under "Calibration"). The sensor should ideally point backwards but will work
equally effectively if pointing forwards. The mounting position must be chosen to provide a rigid fixing with a clear
view of the ground. Anything that moves or vibrates in the radar beam can generate a false speed signal. Please
note the beam spread shown in figure 4. The sensor should ideally be mounted such that the lens is between
30 cm (12”) and 100 cm (39”) above the ground / top of the crop, and is near to the vehicle’s centre of gravity.
This will minimise the effect of the vehicle roll and pitch.
Installation with the bracket
The correct mounting angle is provided using the bracket provided (#2 -fig.1). You can mount the sensor facing
forwards or rearwards, either to the left hand side or right hand side of the vehicle.
Ensure that the bracket is attached to the vehicle with the top edge parallel to the ground.
Figure 2: Mounting positions
Left side-forward / Right side-rearward Left side-rearward / Right side-forward
Replacing a Mk 3P TGSS with a Mk 3V TGSS
If you are replacing a Mk 3P TGSS with a Mk 3V TGSS mounted in the same position on the vehicle. Use Adaptor
Kit Ref. K/TGSS/ADAPT (available on request). Attach the sensor to the adaptor plate using the M6 x 10 Pozi-
Countersink Head screws supplied.
Figure 3 : Sensor mounting using Adaptor Plate
Left side-forward / Right side-rearward Left side-rearward / Right side-forward

TGSS MK3V RADAR SENSOR
K/TGSS/MK3V and K/TGSS/ADAPT
Installation and Calibration Instructions
Doc. No. S/DC/500-10-702 : Issue 4 -2.8.12 Page 3UK702400.DOC
Installation without the bracket
If you are mounting the sensor directly to the vehicle, a self-adhesive mounting template is provided in the kit, for
drilling the mounting holes at the correct spacing and position.
Ensure that the template is placed with the line marked parallel to the ground.
Wiring Connections
The sensor is fitted with an integral cable and 3-way Weatherpack connector.
Connector Pin Sensor Lead Extension Lead Function
ARed Brown +V
BGreen Yellow/Green Signal
CBlack Blue 0V
Calibration
The sensor output is calibrated at 128.5 pulses-per-metre travelled, when the sensor is mounted at the correct
angle from the horizontal (figure 4).
The normal RDS convention is that the "speed sensor factor" is either;
(i) the distance travelled over one interval between sensor pulses (all Pro-Series instruments and Wizard instruments
with software versions prefixed WZxxx / PSxxx.).
At a 37 degree mounting angle, the factor is 0.0078 metres.
NOTE: If the instrument does not have the display resolution to enter the metric factor, then set the display for Imperial
units first then enter a factor of 0.307" (inches). Return to the metric display and the instrument will calculate the
metric factor to the required accuracy.
(ii) the distance travelled over two intervals between sensor pulses -(UDM and Wizard instruments instruments with
software versions prefixed UDMxxx or UDJxxx).
At a 37 degree mounting angle, the factor is 0.0156 metres (or 0.613 ").
"AUTOCAL"
Many instruments have an “Auto Cal” facility for determining the correct Speed Sensor Factor. This is primarily
used where a conventional magnetic sensor is installed, however, note that with the radar sensor, the instrument
should accumulate 12,850 pulses over a 100 metre test run (11,740 pulses over 100 yards).
NOTE: Although the mounting angle for the sensor is specified nominally as 37 degrees from the horizontal, if the
angle is different (for example if mounting options are restricted by the design of the machine), then the
"Autocal" routine will automatically compensate for the different frequency output by the sensor. No
manual calculations are necessary.
Figure 4:
37

TGSS MK3V RADAR SENSOR
K/TGSS/MK3V and K/TGSS/ADAPT
Installation and Calibration Instructions
Doc. No. S/DC/500-10-702 : Issue 4 -2.8.12 Page 4UK702400.DOC
Environmental and Operating Specification
MODEL MK3V :-RDS Part No. S/SR/168-13-003
Velocity Range: 0.3 to 44 mph (0.5 to 70 km/hr)
Accuracy: < ± 3% for 0.3-2 mph (0.5-3 km/hr) < ± 1% for 2-44 mph (3-70 km/hr)
Beam Footprint: Elliptical, 16.4" (41.7 cm) major axis & 9.0” (22.9 cm) minor axis at 24” (61 cm)
mounting height
Beam Pattern: 12.5° in the vertical plane & 12° wide, symmetric around centerline of sensor
Mounting Angle: 37° depressed below horizontal, rear facing (preferred to reduce potential damage)
or forward facing
Mounting Height: 12” to 48” (0.3 to 1.2 m) above the ground or above the top of the crop, typical
mounting height 24” (0.6 m)
Mounting Fasteners: Three (3) of 1/4" -20 UNC cap screws or M6 screws
Overall Dimensions: 3.9” x 3.9” x 3.6” (9.9 cm x 9.9 cm x 9.2 cm)
Weight: Approximately 460 grms w/ cable
Materials : Enclosure : Black Nylon, glass reinforced
Cable: Cable: water resistant 18 AWG 4/C SJOW. Cable length: 16.5cm
Connector Standard: Weather Pack (3-way socket)
Pin A +12V DC (nominal 12V battery voltage)
Pin B Speed Signal Output
Pin C Ground
Mating Connector: Weather Pack (3-way pin)
Electrical Supply: Max. 120 mA @ 12 V DC +9 to 16V DC input voltage range
Output Frequency: 35.7 Hz km-1hr-1@ 37° mounting angle (128.5 pulses per metre)
57.5 Hz mph-1@ 37° mounting angle (3.26 pulses per inch)
Square Wave Output: VOH ˜VDCinput –0.6V –(IOH(mA) X 1kO)
VOL =1.0 V at 10 mA
IOH ˜16mA (Source)
IOL ˜35mA (Sink)
Electrical Protection: Electrical Signal to ground & signal to power supply protection.
Electrical transient protection per ASAE EP-455 Standard.
Step Response: =200 milliseconds delay
Start/Stop Delay: =12 inches (25 cm)
Microwave Freq.: 24.125 GHz (standard). Tolerance ± 50 MHz
Microwave Power: 500mW, EIRP
Fuse: Current Limiting device of 5A min. has to be installed
Approvals: RSS-210 (Industry Canada)
FCC (Part 15, USA)
Environmental
Compliance: EN ISO 14982
ASAE EP-455 which includes standards for reverse polarity, EMI, electrical transients
(such as load dump, inductive load switching), chemical corrosion, dust, salt spray,
rain, wash, mechanical shock, and vibration.
Operating Temp.: -40C to +85C (-40F to 185F)