User guide

38 www.controltechniques.com SM-EZMotion Module User Guide
Figure 55: AutoTune Window Example
Entering Motor Data
When entering motor data parameters, some parameters
are absolutely crucial to fundamental motor operation,
while others are necessary only for optimum performance.
The following chart defines the level of necessity for each
motor data parameter.
Servo Mode
Closed Loop Vector Mode
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 AutoTune Feature
The AutoTune feature in the Unidrive SP 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 and auto tune, and which parameters are
measured by the AutoTune.
Motor Parameter
Required For
Operation
Required for Excellent
Operation
Motor Name •
Peak Current • •
Continuous Current • •
Motor Poles • •
Rotor Inertia •
Motor Ke •
Phase Resistance SP •
Transient Inductance SP •
Max. Operating Speed • •
Thermal Time Constant •
Encoder Phase Angle • •
Motor Parameter
Required for
Operation
Required for Excellent
Operation
Motor Name •
Peak Current • •
Full Load Rated Current • •
Rated Voltage • •
Motor Poles • •
Rotor Inertia •
Rated Frequency • •
Phase Resistance SP • •
Transient Inductance • •
Max. Operating Speed • •
Full Load Rated Speed • •
Thermal Time Constant •
Rated PowerFactor • *
Stator Inductance •
Motor Kt •
Saturation Breakpoint 1 •
Saturation Breakpoint 2 •