User guide

Configuring an Application www.controltechniques.com 35
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.
Rotor Inertia
This parameter specifies the inertia of the motor rotor. The
range is 0.000010 to 90.000000 kg*m^2. The
SM-EZMotion module uses this parameter to interpret the
“Inertia Ratio” parameter found on the Tuning view. “Inertia
Ratio” is specified as a ratio of reflected load inertia to
motor inertia.
Motor Ke
Specifies the Ke of the motor. The units are Vrms/ kRPM.
The line-to-line voltage will have this RMS value when the
motor is rotated at 1000 RPM. The range is 1.0 to 5000.0.
The motor manufacturer will typically provide the Ke data.
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.
N
ote
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 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 (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 backEMF 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 for more information (parameter 3.25).
7.2.1.3.1.2 Closed-loop Vector Motors
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.
N
ote
Since many induction motors can be wired to
operate using either 200V or 400V 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
SP’s rated for 200V, this parameter ranges from 0 to
240VAC. For Unidrive SP’s rated for 400V, this parameter
ranges from 0 to 480VAC.