ABB ACS5000 - Page 38

03 POWER ELECTRONICS AND CABINET FEATURES
3BHS799208 E01 REV E ACS5000 WATER-COOLED USER MANUAL 38/186
VSI-MF
The VSI design employs DC-link capacitors and provides a switched
voltage waveform. As a result of the multilevel topology, the drive
produces an optimum number of switching levels - 9 levels, phase to
phase. The resulting output waveform permits the application of standard
motors without decreasing the reliability and efficiency of the motor.
Figure 3-2 Switching levels
Figure 3-3 Principle of 9-level topology
(1) Volts
(2) Amps
(3) 50 Hz operation point
(4) Voltage
(5) Current
1
2
3
4
5
6
7
8
9
10000 V
5000 V
- 5000 V
- 10000 V
1
2
3
4 5
15000
10000
5000
0
-5000
-10000
-15000
2000
1500
1000
500
0
-500
-1000
-1500
-2000