Scalar Motor Control - ABB ACS580 Firmware Manual

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Scalar motor control

Scalar motor control is the default motor control method. In scalar control mode, the
drive is controlled with a frequency reference. However, the excellent performance of
vector control is not achieved in scalar control.
It is recommended to activate scalar motor control mode in the following situations:
• If the exact nominal motor values are not available or the drive needs to run
different motor after the commissioning phase
• If a short commissioning time is needed or no ID run is wanted
• 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)
• If the drive runs a medium-voltage motor through a step-up transformer.
In scalar control, some standard features are not available.
See also section Operating modes of the drive
IR compensation for scalar motor control
IR compensation (also known as
voltage boost) is available 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 vector control, no IR compensation is
possible or needed as it is applied
automatically.
Settings
• Menu - Primary settings - Motor - IR compensation
• Parameters 97.13 IR compensation
(page 317)
• Parameter group 28 Frequency reference chain
(page 89).
Motor voltage
IR compensation
No compensation
(page 314) and 99.04 Motor control mode
(page 213).
Program features 103
f (Hz)