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Settings
Parameters
20.25 Jogging enable
(page 240),
20.27 Jogging 2 start source
22.43 Jogging 2 ref
time jogging
(page 260).
Scalar motor control
It is possible to select scalar control as the motor control method instead of DTC
(Direct Torque Control). In scalar control mode, the drive is controlled with a speed or
frequency reference. However, the outstanding performance of DTC is not achieved
in scalar control.
It is recommended to activate scalar motor control mode
• 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, or
• in multimotor drives, if
•
the load is not equally shared between the motors,
•
the motors are of different sizes, or
•
the motors are going to be changed after motor identification (ID run)
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 step-up
applications, voltage cannot be fed
through the transformer at 0 Hz, so an
additional breakpoint is available for
defining the compensation near zero frequency.
In Direct Torque Control (DTC), no IR compensation is possible or needed as it is
applied automatically.
(page 240),
(page 253),
23.20 Acc time jogging
Standard program features 99
20.26 Jogging 1 start source
(page 241),
22.42 Jogging 1 ref
(page 260) and
(page 43).
Motor voltage
IR compensation
No compensation
(page 253),
23.21 Dec
f (Hz)
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