Settings and diagnostics
Parameters: 1.102 Line current (page 140)…1.164 LSU nominal power, 5.111 Line
converter temperature…5.121 MCB closing counter, 6.36 LSU Status Word…6.43 LSU
CW user bit 3 selection, 6.116 LSU drive status word 1…6.118 LSU start inhibit status
word, 7.106 LSU loading package name…7.107 LSU loading package version, 30.101
LSU limit word 1…30.149 LSU maximum power limit, 31.120 LSU earth fault…31.121
LSU supply phase loss, 95.20 HW options word 1 (page 504) and 96.108 LSU control
board boot (page 518).
Parameter groups: 60 DDCS communication (page 441), 61 D2D and DDCS transmit
data (page 457), 62 D2D and DDCS receive data (page 462) and 94 LSU control (page 496).
Events: 7580 INU-LSU comm loss (page 557), 7584 LSU charge failed (page 557), AF80
INU-LSU comm loss (page 576) and AF85 Line side unit warning (page 576).
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 63).
Settings and diagnostics
Parameters: 99.4 Motor control mode (page 528) and 99.13 ID run requested (page 531).
46 Program features
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