54 EZMotion User/Programming Guide
www.controltechniques.com Revision: A8
Servo Mode
Closed Loop Vector Mode - SM-EZMotion/Unidrive SP Only
In some cases, the certain motor parameters are handled differently based on the values entered by the user.
If the Stator Inductance is set to a value of zero, then the user MUST provide a value for the motor Rated Power Factor in order
to run the motor. That value specified by the user is written to parameter 5.10 and is used in the control algorithm. However, if the
user enters a non-zero value for Stator Inductance, then the Unidrive SP runs a background task that continuously calculates the
motor Rated Power Factor Value. In this case, the user-entered value for Power Factor is ignored.
Using the Auto-Tune Feature
The Auto-Tune feature in the Unidrive SP and Digitax ST can help us to measure certain motor parameters that are not provided by
the motor manufacturer or are not easily accessible. The following chart shows which parameters must be entered in order to run an
Auto-Tune, and which parameters are measured by the Auto-Tune.
Motor Parameter Required For
Operation
Required for Excellent
Operation
Motor Name Yes
Peak Current Yes Yes
Continuous Current Yes Yes
Motor Poles Yes Yes
Rotor Inertia Yes
Motor Ke Yes
Phase Resistance SP Yes
Transient Inductance SP Yes
Max. Operating Speed Yes Yes
Thermal Time Constant Yes
Encoder Phase Angle Yes Yes
Motor Parameter Required for
Operation
Required for Excellent
Operation
Motor Name Yes
Peak Current Yes Yes
Full Load Rated Current Yes Yes
Rated Voltage Yes Yes
Motor Poles Yes Yes
Rotor Inertia Yes
Rated Frequency Yes Yes
Phase Resistance SP Yes Yes
Transient Inductance Yes Yes
Max. Operating Speed Yes Yes
Full Load Rated Speed Yes Yes
Thermal Time Constant Yes
Rated Power Factor Yes
Stator Inductance Yes
Motor Kt Yes
Saturation Breakpoint 1 Yes
Saturation Breakpoint 2 Yes
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