9000X AF Drives User Manual
6-6 For more information visit: www.eaton.com
MN04001004E
June 2009
Manual Tuning of the SVX9000/SPX9000
Proper tuning of the open loop speed control will give better torque control accuracy for
improved motor performance. The aim of tuning is to get the motor model as close to the
actual motor as possible through proper setting of parameters. Open loop tuning consists of
three functions, 1) V/f curve tuning, 2) stator resistance measurement, and 3) compensation
for slip.
Figure 6-1: Open Loop Tuning
U/f
Curve Midpoint
Frequency
Output Voltage
at Zero Frequency
V/f
Curve Midpoint
Voltage
Voltage at Field
Weakening Point
V
V
N
Programmable
Linear
fN
Field Weakening
Point
f
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