User guide

36 www.controltechniques.com SM-EZMotion Module User Guide
N
ote
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
The synchronous speed of the motor is the rated speed
without slip taken into account.
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.
Rated Frequency
This parameter specifies the Rated Frequency of the
motor. The applied frequency will directly affect the speed
of the motor. 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 0.0
to 1250.0 Hz.
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 ohmmeter. 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 motor files created for En, Epsilon, or
MDS drives.
Transient Inductance
Specifies the phase inductance of the motor. This is the
inductance measured from phase to ground, NOT
phase-to-phase. The range is 0.00 to 5000.00 mH.
Max Operating Speed
This parameter specifies the maximum speed of the motor
when used with a variable speed drive to achieve velocities
over the rated base speed of the motor.
This parameter is not to be confused with the Full Load
Rated Speed of the induction motor. The motor
manufacturer typically provides this value. The range for
the Max Operating Speed is 40000.0 rpm (depending on
encoder resolution).
Full Load Rated Speed
This parameter specifies the rated speed of the motor that
would be achieved if the motor were attached directly to the
rated line voltage. The motor manufacturer typically
provides this information. The range for the Full Load
Rated Speed is 0.0 to 40000.0 rpm (depending on encoder
resolution).
Some manufacturers refer to this parameter as Base
Speed, Base 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).
Rated Power Factor
This parameter specifies the motor rated full load power
factor. Power Factor is the angle between the motor
voltage and motor current vectors. This parameter can be
provided by the user, or can be measured using the
AutoTune feature of the Unidrive SP (described later). The
range for the Power Factor parameter is 0.000 to 1.000.
Stator Inductance
This parameter specifies the motor stator inductance and
is defined as the inductance of the motor stator when rated
flux is applied. This parameter is used to create velocity
loop gains for the SM-EZMotion module and Unidrive SP.
This value can be provided by the motor manufacturer, or
can be measured using the AutoTune feature of the
Unidrive SP (See “Run Auto Tune Button” on page 37).
The range for the Stator Inductance is 0.00 to 5000.00 mH.
Motor Kt
This parameter specifies the torque constant of the motor,
which is defined as the amount of torque produced per
Amp. The units for this parameter are (N*m) / Amp. This
parameter can be provided by the motor manufacturer, or
can be measured by using the Unidrive SP AutoTune
feature (explained later). The range for this parameter is
0.00 to 500.00 Nm/A.