MLS MMLS3, Operator'S Manual

Page: 21 / 48

MLS Test Systems Pty Ltd
Revised: April 2013
19
3.3 Running the machine
3.3.1 Set the machine up as described under 3.2 above.
3.3.2 Connect the control unit to a 220 VAC supply and connect the
three cables to the machine. The red plug feeds 3-phase power
to the AC motor, the blue plug feeds power to the DC
servomotor for lateral displacement and the black plug handles
the counter and control circuits. Total consumption is about
1.5 kW.
3.3.3 Always first run the machine at a slow speed (10 Hz) for at least
one revolution of the bogie chain to make sure that nothing is in
the way and the machine is clear to run.
3.3.4 The motor speed is set by the small round knob on the motor
controller. Set to 48 Hz to obtain 7 200 axles/hour (2
axles/sec.) For more details on the operation of the motor
control unit, 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
excessive friction somewhere. Stop the machine and
investigate. The unit will trip at about 5.5A, displaying oL3.
3.3.6 The lateral displacement system automatically switches on when
the main motor runs at more than about 20 Hz and switches off
when it is stopped or slowed down to below that speed. The
maximum displacement is 75mm (3”) to either side of the centre
line of the track (150mm (6”) total). This distance is
continuously adjustable down to zero by the multi-turn control
knob to the right of the counter in the control box. The
maximum setting on the control knob is 75, which gives the
maximum displacement. Setting the knob at a higher value will
not increase the displacement, but will distort the lateral spread
pattern of the wheels. See Appendix B for more details on the
lateral displacement system.