
BA Intellidrive User’s Manual
Getting Started
Version 1.4
Aerotech, Inc.
2-27
The user can stop adjusting “Ki” and start adjusting “Kpos.”
6.
Adjust the Position Loop using “Kpos.” Use a starting value of 500-1000 for
Kpos. As the user increases Kpos, it will be observed that the position error is
reduced The main objective is to adjust Kpos until the position error is within
user’s tolerance or starts to oscillate; whatever comes first.
As previously mentioned, if Kpos is too high, the user will encounter a high
frequency oscillation (stage vibrates strongly). This will cause the BAI to have a
RMS Current Trap, which essentially means that too much current is being sent
to the motor (the RMS Current Trap acts the same way as a fuse).
Shown in Figure 2-33 is a plot of a good Kpos. From this graph it can be seen
that there is little settling time. In other words, the position error ends near
the same time the Velocity Command ends; so the move is “in position” at the
end of the commanded move. For comparison, Figure 2-34 illustrates a plot
where Kpos is too high.
Figure 2-33.
Plot Showing an Appropriate Value for Kpos
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