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MMLS3 OPERATOR’S MANUAL

The aim of the MMLS3 Operators
Manual

give

information

regarding safe and efficient techniques
in operating the MMLS3.

The  machine  is  a  scaled  down  heavy
vehicle  simulator  used  for  accelerated
trafficking  of  model-  or  full  scale
pavements.

Summary of Contents for MMLS3

Page 1: ...s Manual is to give information regarding safe and efficient techniques in operating the MMLS3 The machine is a scaled down heavy vehicle simulator used for accelerated trafficking of model or full sc...

Page 2: ...3 2 Setting up the machine on the pavement 13 3 2 1 Getting the machine into position 13 3 2 2 Adjusting the height 15 3 3 Running the machine 19 SECTION 4 MAINTENANCE 21 4 1 The yellow polyurethane g...

Page 3: ...Two link arms about 350mm long to link the machine to the base plates See fig 4 2 An electric orange control box 3 An electronic calibration unit to set the wheel load See Fig 3 This is packed in a w...

Page 4: ...crate by undoing all the screws on the top and remove the top plywood sheet Also remove at least one of the side panels Remove the straps and using a crane lift the machine from the pallet by the sin...

Page 5: ...MLS Test Systems Pty Ltd Revised April 2013 3 1 3 Inspect the machine for damage during transport Visually check for bent or broken parts If anything looks suspicious please contact the supplier...

Page 6: ...ns each with six guide wheels e The drive drum f The curved wheel guide g The mechanism for lateral displacement h Detachable castors for moving the machine over short distances i The control unit in...

Page 7: ...MLS Test Systems Pty Ltd Revised April 2013 5...

Page 8: ...n the pavement To simulate lateral spread of wheel loads on the pavement the entire machine is displaced in the lateral direction by an electric motor The motor is controlled in such a way that more w...

Page 9: ...LS Test Systems Pty Ltd Revised April 2013 7 however that under wet and dirty conditions faster than normal wear and tear will occur which may shorten the life of the machine or some of its components...

Page 10: ...under 3 2 2 Set the lateral displacement as described in 3 3 6 below Set the speed to a low value say 10 Hz as described in Appendix A below and press the green RUN button on the outside of the orang...

Page 11: ...of the vertical displacement of the wheel It is thus possible to set the wheel load beforehand and as long as it stays within the specified displacement range during operation rutting of the pavement...

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Page 14: ...e the wheel is pushed down than while letting it move back Turn the crank forwards and backwards about one revolution at a time and note the average reading 3 1 1 4 From time to time apply some MS gre...

Page 15: ...above 3 1 2 7 If the load is still not correct use the measured load increment and number of turns see 3 1 2 3 to calculate the required number of turns to arrive at the correct value and repeat the a...

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Page 17: ...top so that they engage with the four bearings on the two skateboards Under operating conditions it may be necessary to fix the base plates to the pavement to prevent them from moving around The best...

Page 18: ...rs move away from the metal frame The pavement now counteracts the force of the spring and the set wheel load is applied to the pavement To be sure that the correct load is applied to the pavement the...

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Page 20: ...fig 5 p16 and find the PVC measuring tool shaped like a human leg and foot The toe of the gauge is 8mm high increasing to 10mm where it is attached to the leg Holding the gauge by the leg measure the...

Page 21: ...t see appendix A 3 3 5 With the machine running press DISPL until the motor current is displayed in Amps IOUT led is on The current at full speed should stay below 4 6 A A higher current indicates exc...

Page 22: ...ped it may be necessary to stop the machine and readjust the suspension gaps as described under 3 2 2 above 3 3 8 To use the RUN and STOP buttons on the keypad instead of the green and red buttons on...

Page 23: ...onite guide rails to steer the bogies and link sections Although Vesconite is a good bearing material the wheels may wear under dusty or dirty conditions New wheels are 33mm wide Measure the width and...

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Page 25: ...d the rail ends should be between 0 2mm and 0 5mm measured with a feeler gauge at its narrowest point The shaft of the drum is mounted on horizontal slides and is spring loaded in the horizontal direc...

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Page 27: ...ing plate With a feeler gauge measure the gap between the drum and the upper guide rail end Adjust it to between 0 2 and 0 5mm at the narrowest position by turning the set crews It may be necessary to...

Page 28: ...re that the machine frame is square by measuring the diagonal distances from the bottom of the left hand side panel to the top of the right hand panel as well as from the bottom of the right hand pane...

Page 29: ...he rail end to give a smooth joint with the rail and lightly tighten the bolt on that side Then set the other end to obtain the required gap with the drum Tighten all the bolts and recheck the gaps 4...

Page 30: ...MLS Test Systems Pty Ltd Revised April 2013 28 end of the guide wheel axle Slide the trailing arm outwards so that the wheel shaft can be disengaged and the 300mm wheel removed...

Page 31: ...wdriver or something similar and push down the tyre with a lever action as indicated in the right hand picture below Work around the rim until the tyre is free from the rim Remove the upper rim half L...

Page 32: ...not rotate relative to the tyre as this will damage the valve 4 5 6 Inflate the tyre to about 200 kPa and then tighten the 5 cap screws to about 20 Newton meter 200 lbf inch To prevent damage to the...

Page 33: ...to an easily accessible position TO AVOID INJURY WHEN MOVING IT BY HAND ONLY HANDLE IT BY THE ROUND AXLES OF THE LINK SECTIONS Take a spare spacer and apply some MS grease to the thread of the spring...

Page 34: ...key to select the digit parameter you would like to change Next use the and V keys to select the parameter group sub group or number Modify the parameter value using the and V key and press the ENTER...

Page 35: ...ry defaults The following parameter have been changed from their factory default values Do not change any of these values before first consulting MLS Test Systems Please see section 1 Programming whic...

Page 36: ...12 Volt servomotor while the feedback signal runs through the cable with the small black 6 pin connector The maximum displacement is 75mm 3 to each side of the centre line This is infinitely adjustabl...

Page 37: ...he right hand rear guide wheel on bogie no 3 would thus be referred to as B3RR and the left hand centre wheel on link section no 2 would be L2LC etc Keep a record of measurements and observations Sett...

Page 38: ...C the inflation pressure P should be P 700 x 273 C 20 C 273 C 50 C 635 kPa Because the tires are small losing only a small amount of air can cause a significant drop in pressure When using a hand gau...

Page 39: ...me cracks are allowable but if bits of polyurethane starts to break off the wheel should be replaced The centre wheels on the bogies carries more load than the others Wheels which start to show signs...

Page 40: ...nds fig 6 If the ends are worn to a sharp or cracked edge that may damage the guide wheels they must be removed and ground or filed back to a blunt smooth edge about 0 5mm thick Use sandpaper to smoot...

Page 41: ...ire length of the strips 3 3 Check the hinge on the wheel guide Refer to fig 1B The bottom end of the wheel guide is hinged so that its tip can rest on the pavement guiding the rubber wheel smoothly d...

Page 42: ...MLS Test Systems Pty Ltd Revised April 2013 40 APPENDIX D Circuit diagrams...

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Page 47: ...on Tyre footprint area 34 cm2 Tyre contact pressure 750 kPa max Tyre model Vredestein 4 00 4 6PR V76 Tyre tube model Vredestein 4 00 4 TR87 Maximum speed 2 5 m s Maximum wheel loads hour 7200 Supply V...

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