ABB ACS2000 User Manual page 74

Chapter 3 - Control system
3.2.1.4 Speed and torque control
Torque reference
or
Speed reference
Actual speed
Figure 3-6 DTC control platform
3-6 (26)
Main power supply
MV switchgear
ACS2000
Motor
Figure 3-5 Typical single-line drive system
The switchgear disconnects the power supply when required by the
process or when a fault occurs. Examples of switchgear compatible with
the ACS2000 are MV circuit breakers, fused vacuum contactors or motor
control centers.
On drives equipped with the integral input contactor disconnect option, the
MV switchgear is integrated within the drive.
See Appendix G - MV switchgear guide, located on the CD, for further
information.
See Appendix P - Integral Input Contactor Disconnect, located on the CD,
for further information on drives with this option.
The speed and torque of the motor is controlled by DTC (Direct Torque
Control). The DTC motor control platform, unique to ABB, provides
accurate speed and torque control with high dynamic speed response.
DTC is implemented on the AMC circuit board of the INU.
Torque-
reference
controller
Speed
controller
2UEA001270 Rev. F
MV switchgear
control interface
Higher level
control system
Local drive on/off
M
control
Torque
flux
comparator
Motor
model
Switching
logic
Switch
positions
Voltage
Current
M
ACS2000 User manual