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group
94 LSU
control. A regenerative supply unit will also send actual signals to
the inverter unit which are visible in parameter group
Settings and diagnostics
Parameters:
1.102 Line current (page 138)...1.164 LSU nominal
converter temperature...5.121 MCB closing
LSU CW user bit 3
status
word,
7.106 LSU loading package name...7.107 LSU loading package
30.101 LSU limit word 1...30.149 LSU maximum power
fault...31.121 LSU supply phase
LSU control board boot (page
Parameter groups:
data (page
423),
62 D2D and DDCS receive data (page 430)
control (page
504).
Events:
7580 INU-LSU comm loss (page
AF80 INU-LSU comm loss (page 588)
Motor control
￭
Direct torque control (DTC)
The motor control of the ACS880 is based on direct torque control (DTC), the ABB
premium motor control platform. 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, DC voltage
controller or directly from an external torque reference source.
Motor control requires measurement of the DC voltage and two motor phase
currents. Stator flux is calculated by integrating the motor voltage in vector space.
Motor torque is calculated as a cross product of the stator flux and the rotor
current. By utilizing the identified motor model, the stator flux estimate is
improved. Actual motor shaft speed is not needed for the motor control.
The main difference between traditional control and DTC is that torque control
operates on the same time level as the power switch control. There is no separate
voltage and frequency controlled PWM modulator; the output stage switching is
wholly based on the electromagnetic state of the motor.
The best motor control accuracy is achieved by activating a separate motor
identification run (ID run).
See also section
Scalar motor control (page
Settings and diagnostics
Parameters:
99.4 Motor control mode (page 536)
requested (page
539).
selection,
6.116 LSU drive status word 1...6.118 LSU start inhibit
loss,
95.20 HW options word 1 (page 513)
526).
60 DDCS communication (page
1 Actual
counter,
6.36 LSU Status Word...6.43
limit,
405),
568),
7584 LSU charge failed (page
and
AF85 Line side unit warning (page
88).
and
99.13 ID run
Program features 77
values.
power,
5.111 Line
31.120 LSU earth
and
61 D2D and DDCS transmit
and
94 LSU
version,
96.108
568),
588).
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