By parameter 60.64, data sets 24 and 25 can be selected instead of data sets 32
and 33.
The update intervals of the data sets are as follows:
• Data sets 10…11: 2 ms
• Data sets 12…13: 4 ms
• Data sets 14…17: 10 ms
• Data sets 18…25, 32, 33: 100 ms.
Settings and diagnostics
Parameter groups: 60 DDCS communication (page 489), 61 D2D and DDCS transmit
data (page 505) and 62 D2D and DDCS receive data (page 510).
Events: 7581 DDCS controller comm loss (page 670) and A7CA DDCS controller comm
loss (page 685).
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 101).
Settings and diagnostics
Parameters: 99.4 Motor control mode (page 621) and 99.13 ID run
requested (page 624).
Program features 83
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