Scalar Motor Control - ABB ACS280 Firmware Manual

36 Program features
Settings and diagnostics
99.13 ID run requested
Parameter
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 (
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.
Operating modes of the drive
See also section
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
compensation
(page
Events: -
(page
28 Frequency reference chain
283 99.04 Motor control mode
) and
291
).
31.19 Motor phase loss
28
on page
Motor voltage
IR compensation
No compensation
169
(page ). Paramters
(page
.
f
(Hz)
97.13 IR
288
).
) as