Program features 73
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, such as
positive displacement pumps, 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
) and
(page
)
).
Vector control
Vector control is the motor control mode that is intended for applications where high
control accuracy is needed. It offers better control over whole speed range, in
particular in applications where slow speed with high torque is needed. It requires an
identification run at startup. Vector control cannot be used in all applications, eg when
sine filters are being used or there are multiple motors connected to single drive.
The switching of the output semiconductors is controlled to achieve the required
stator flux and motor torque. The reference value for the torque controller comes from
the speed controller.
Stator flux is calculated by integrating the motor voltage in vector space. Rotor flux
can be calculated from stator flux and the motor model.Motor torque is produced by
controlling current 90 degrees from the rotor flux.By utilizing the identified motor
model, the rotor flux estimate is improved. Actual motor shaft speed is not needed for
the motor control.
See also section
(page
Settings
•
Menu - Primary settings - Motor - Control mode
• Parameters
(page
) and
(page
).
Motor voltage
f
(Hz)
IR compensation
No compensation
Summary of Contents for ACQ580
Page 1: ...ABB drives for water Firmware manual ACQ580 pump control program ...
Page 4: ... 2017 ABB Oy All Rights Reserved 3AXD50000035867 Rev C EN EFFECTIVE 2017 06 21 ...
Page 30: ...26 Start up control with I O and ID run ...
Page 40: ...36 Default configuration ...
Page 304: ...300 Parameters ...
Page 340: ...336 Additional parameter data ...