MLS MMLS3, Operator'S Manual

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MLS Test Systems Pty Ltd
Revised: April 2013
6
makes the wheel load practically independent (±5%) of displacement
within the 20mm range. When in operation, the suspension is kept
within its working range by adjusting the legs on the fixed frame. Care
should be taken not to overload the suspension by lowering the frame too
far.
The control unit is housed in a 400 x 500 x 200 “electric orange” IP65
(weather proof) metal box. It contains the following components:
1. The motor controller. See Appendix A for operating details.
2. Two counters to count the total number of wheel loads. One
counter is not resetable and its reading must be multiplied by
10, while the other one can be preset to stop the machine after a
set number of wheel loads.
3. The control system for the lateral displacement of the wheels on
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 wheel
loads are applied near the centre of the track, giving a Normal
(Raleigh) distribution of loads over the width of the track. See
Appendix B for more details.
The 6 amp. trip switch (marked DC) on the right hand side of
the main switch serves as an electronic shear pin and will switch
the machine. The total width of the lateral spread of the wheels
on the pavement can be set by the knob next to the counter.
Power supply to the machine is 220 Volt 50/60 Hz AC at about 1.5 kW
(7 Amp).
Using the machine on wet pavements
The MMLS3 may be used on wet pavements. Most parts of the machine
(including the ball bearings in all the wheels) are made of stainless steel
or other corrosion resistant material. The electric connectors and
enclosures are of the IP65 (weather proof) type. It must be kept in mind,