70 Program features
Settings
Parameter group 23 Speed ctrl (page 176).
Diagnostics
Parameters 01.01 Motor speed rpm (page 112), 01.02 Motor speed % (page 112) and
01.14 Motor speed est (page 112).
Scalar motor control
It is possible to select scalar control as the motor control method instead of Direct
Torque Control (DTC). In scalar control mode, the drive is controlled with a frequency
reference. However, the outstanding performance of DTC is not achieved in scalar
control.
It is recommended to activate the scalar motor control mode in the following
situations:
• In multimotor drives: 1) if the load is not equally shared between the motors, 2) if
the motors are of different sizes, or 3) if the motors are going to be changed after
motor identification (ID run)
• If the nominal current of the motor is less than 1/6 of the nominal output current of
the drive
• If the drive is used without a motor connected (for example, for test purposes).
In scalar control, some standard features are not available.
Settings
Parameter 99.05 Motor ctrl mode (page 283).
IR compensation for a scalar controlled drive
IR compensation is active only when
the motor control mode is scalar. When
IR compensation is activated, the drive
gives an extra voltage boost to the
motor at low speeds. IR compensation
is useful in applications that require a
high break-away torque.
In Direct Torque Control (DTC), no IR
compensation is possible or needed.
Settings
Parameter 40.07 IR-compensation (page 220).
f (Hz)
Motor voltage
No compensation
IR Compensation
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