Eaton SPI9000 User Manual Page 60

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50 9000X AF Drives MN04001004E—May 2011 www.eaton.com
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.
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
f
N
Field Weakening
Point
f
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