Danaher Motion SuperDrive ACS24 Series, User Manual

Page: 53 / 99

26.04.2005
Configuration & control of the AC SuperDrive
6.5
B
EST PERFORMANCE CURVE
O
PTION
6.5.1.1 G
ENERAL
The Best Performance Curve functionality is implemented after the Speed Ramp and before the
Speed PI controller, as can be seen in the
Figure 22. Speed Control. The purpose of the Best
Performance Curve, or the 8-point curve as it also is called, is to save battery lifetime and get an
optimal efficiency out of the ACS-motor system. The Best Performance Curve limits the torque
(i.e. Torque Current) as a function of the motor speed (Actual Speed).
An example of a Best Performance Curve is shown in Figure 25 . 8 points specify the curve and
between the points a linear interpolation is used. A Torque Current and a Speed give each point.
Figure 25. Best Performance Curve
Option
.
6.5.2 S
PEED
PI
CONTROLLER
The Speed PI controller is a normal PI controller with two inputs, the Internal Speed Reference
and the Actual Speed, and one output, the Torque Current. Depending on if speed ramps are
used or not the PI controller works a bit differently. If no ramps are used, there is only one I-gain
used (one for each parameter set). If ramps are used, there are a total of three I-gains (three for
each parameter set). This is summarized in
Table 9 where also the other parameters that apply
for the Speed PI Controller are described.
6.6 T
ORQUE CURRENT LIMITATION
The amplitude and derivate of the unlimited Torque Current, which is the output of the Speed PI
controller, is checked and if necessary limited in the Torque Current Limitation block (see
Figure
22 ).
User's Guide 1.0 Item No.
89Y05120A
53