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5-34 Operation
MN1941
The analog demand output is controlled by a 12-bit DAC, which can create output voltages in the
range -10 V to +10 V. This means a maximum output of +10 V corresponds to a DAC value of
2048. The value of KVELFF is calculated by dividing 2048 by the number of quadrature counts
per servo loop, so:
KVELFF
=
2048 / 200
=
10.24
5. Click in the KVELFF box and enter the value.
The calculated value should give zero
following error at constant velocity. Using
values greater than the calculated value will
cause the controller to have a following error
ahead of the desired position. Using values
less than the calculated value will cause the
controller to have following error behind the
desired position.
6. In the Move Type drop down box, check that
the move type is set to Trapezoid.
7. Click in the Distance box and enter a distance
for the step move. It is recommended to set
a value that will cause the motor to make a
few revolutions, for example 10.
Note:
The distance depends on the scale set in section 5.5.4. If you set a scale so that
units could be expressed in revolutions (or other unit of your choice), then those are
the units that will be used here. If you did not set a scale, the amount you enter will
be in encoder counts.
8. Click
Go
.
The NextMove
e
100 will perform the move and the motor will turn. As the soon as the move
is completed, Mint WorkBench will upload captured data from the NextMove
e
100. The data
will then be displayed in the Capture window as a graph.
Note:
The graph that you see will not look exactly the same as the graph shown here!
Remember that each motor has a different response.
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