ABB ACS280, Firmware Manual, Page: 36 / 430

36 Program features
Settings and diagnostics
Parameter 99.13 ID run requested (page 291 ).
Events: -
 Scalar motor control
Scalar motor control is the default motor control method. It is suitable for
applications which do not require the control accuracy available in vector
control. In scalar control, you control the drive output frequency reference, and
you do not need to do any motor identification at the first start.
ABB also recommends to activate scalar motor control mode in the following
special 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
Note: Do not activate the motor phase loss fault (
31.19 Motor phase loss
) as
the drive cannot measure the motor current accurately.
• 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 features are not available.
See also section
Operating modes of the drive
on page
28
.
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 and diagnostics
Parameter group
28 Frequency reference chain
(page
169
). Paramters
97.13 IR
compensation (page 283 ) and 99.04 Motor control mode (page 288 ).
Events: -
Motor voltage
f (Hz)
IR compensation
No compensation