Operation 5-23MN1903
Theanalog demand output is c ontrolled by a 12-bit DAC, which can create output v oltages in
therange -10Vto +10V. This means a maximum output of +10V c orresponds to a DAC value
of2048. The value of KVELFFis calculated by dividing 2048 by the number of quadrature
counts per servo loop, so:
KVELFF = 2048/ 200
=10.24
5. Clickin the KVELFF box andenterthe value.
Thecalc ulated value should give zero
followingerr or in normal operation. Using
values greater than the calculated value will
cause the controller to have a following
errorahead of t he desired position. Using
values less than the calculated value will
cause the controller to have following error
behindthe desired pos ition.
6. Inthe Move Type drop down box, checkthat
themove ty pe is set to Trapezoid.
7. Clickin the Distance box andentera distance
for the step move. It is recommended to set
a value that will cause the motor to make a
fewrev olutions, for example 10.
Note: Thedistance depends onthe s cale set in section 5.3.3. If you set a scale s o that
unitsc ould be expressed in revolutions (or other unit of your c hoice), then those
arethe units thatwill be us ed here. If you did not set a scale, the amount you
enterwill be in enc oder counts.
8. Click Go.
TheNex tMove PCI will perform the move and the motor will turn. As the soon as the
moveis completed, WorkBench v5 will download captured data from the NextMove PC I.
Thedata will then be dis played in the Capture window as a graph.
Note: Thegraph that you s ee will not look exactly the same as the graph shown her e!
Rememberthat eac h motor has a slightly different response.