50 EZMotion User/Programming Guide
www.controltechniques.com Revision: A8
Phase Resistance SP
Specifies the phase resistance of the motor. You can determine this value by measuring the resistance between any motor phase
and ground with an ohm-meter. The range is 0.000 to 30.000 Ohms. The motor manufacturer will typically provide the
phaseResistance data.
NOTE
This parameter is not the same as the phaseResistance parameter found in the .ddf file used for En/Epsilon/MDS drives. Do not
copy this value from stdmotor.ddf.
Phase Inductance SP
Specifies the phase inductance of the motor. This is the inductance measured from phase to ground and NOT phase-to-phase. The
range is 0.00 to 5000.00 mH.
Max Operating Speed
Specifies the maximum operating speed of the motor. It is used by the drive to limit the Velocity Command. The valid range for this
parameter is 0.0 to 40,000.0 RPM.
Thermal Time Constant
Specifies the Thermal Time Constant of the motor. This parameter is used by the Unidrive SP/Digitax ST for thermal protection of the
motor. The drive models the temperature of the motor using a formula that generates an overload accumulator value. The formula is
a function of the Thermal Time Constant. When the accumulator reaches 100%, the drive can trip or foldback depending on other
drive settings. For more information on the Thermal Time Constant, please refer to the Unidrive SP Advanced User Guide or the
Digitax ST User Guide (parameters 4.15, 4.16, and 4.19).
Encoder Phase Angle
This is the angle between rising edge of the V commutation signal and the peak of VVW back EMF signal when rotating the motor in
the clockwise direction.
Reference for the clockwise direction is looking at the front end of the motor shaft. See Unidrive SP Advanced User Guide or Digitax
ST User Guide for more information (parameter 3.25).
8.2.4 Closed-loop Vector Motors- SM-EZMotion/Unidrive SP Only
When the user has selected Closed-loop Vector from the Drive mode list box, the user must either select one of the pre-configured
vector motors from the Motor Type list or create a new vector motor data file by editing the Motor Parameters column.
Following is list of parameters necessary for configuration of a Vector motor and a description of each:
Motor Name
The motor name is limited to 12 characters and must begin with an alpha character (non-numeric character). This is the motor name
that will appear in the Motor Type list box on the Drive/Encoder view in PowerTools Pro.
Peak Current
Specifies the peak current allowed by the motor. The valid range is 0.00 to 9999.99 Amps (rms). The motor manufacturer may or
may not provide the peak current data. If no value is provided by the manufacturer, a typical value to use can be 2 times the Full
Load Rated Current of the motor. For exact value for this parameter, it may be necessary to contact the motor manufacturer.
If a system is “drive limited” (meaning that the motor can handle more current than the drive can deliver), the peak current actually
used by the system may be lower than the value specified here.
Full Load Rated Current
This parameter specifies the rated continuous current for the motor. Motor data sheets refer to this as the Full Load Rated Current.
The valid range is 0.00 to 9999.99 Amps (rms). The motor manufacturer provides this information.
Some manufacturers refer to this value as Full Load Amps or F/L Amps.
NOTE
Since many induction motors can be wired to operate using either 200 V or 400 V supply ranges, it is important to use the Full
Load Rated Current at the desired Voltage Rating.
Rated Voltage
This parameter specifies the motors rated operating voltage. This value is usually printed on the motor nameplate as well as on a
motor data sheet provided by the motor manufacturer. The range for this parameter is dependant upon what drive is being used. For
Unidrive SPs rated for 200V, this parameter ranges from 0 Vac to 240 Vac. For Unidrive SPs rated for 400 V, this parameter ranges
from 0 Vac to 480 Vac.
NOTE
Since many induction motors can be wired to operate using either 200V or 400V supply ranges, it is important to use the proper
nameplate ratings based on the selected supply voltage.
Motor Poles
Specifies the number of magnetic poles on the motor. The supported values are 4 to 120. The motor manufacturer typically provides
the motor pole information.
If the manufacturer does not provide the motor poles information, there is a simple calculation that allows you to determine the # of
poles based on several known parameters. The calculation is as follows:
# of Poles = (2 * Rated Frequency * 60) / Motor Synchronous Speed
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