Chapter 3 – Hardware Description
ACA 635 IGBT Supply Sections
3-5
ISU and DSU in Parallel
A diode supply unit must not be connected galvanically in parallel with
an IGBT supply unit in the same a.c. supply as the synchronisation
would fail. The parallel configuration is allowed only with a supply
transformer equipped with two secondary windings. This configuration
is beneficial when the motoring power is considerably higher than the
braking power and the brakings are short.
Start mode DC LEVEL START (Parameter 21.01 value 1) must be
used. During motoring the ISU is not modulating, only the free wheeling
diodes are conducting. The motoring current is flowing mainly through
the DSU diode bridge, because the line impedance of the ISU is a lot
higher than the impedance of the DSU diode bridge.
Diagram
An allowable parallel configuration of the ISU and the DSU is shown
below.
~
=
~
=
~
=
~
=
ISU
ICU
FIU
NAMC
NPBU
NDCU
~
=
DSU
~
=
ISU
Summary of Contents for ACS 600 MultiDrive
Page 4: ......
Page 8: ...Safety Instructions vi ACA 635 IGBT Supply Sections ...
Page 57: ...Chapter 7 Fault Tracing 7 8 ACA 635 IGBT Supply Sections ...
Page 99: ...Appendix B Circuit Diagrams B 2 ACA 635 IGBT Supply Sections H ...
Page 100: ...Appendix B Circuit Diagrams ACA 635 IGBT Supply Sections B 3 ...
Page 101: ...Appendix B Circuit Diagrams B 4 ACA 635 IGBT Supply Sections ...
Page 102: ...Appendix B Circuit Diagrams ACA 635 IGBT Supply Sections B 5 ...
Page 103: ...Appendix B Circuit Diagrams B 6 ACA 635 IGBT Supply Sections ...
Page 104: ...Appendix B Circuit Diagrams ACA 635 IGBT Supply Sections B 7 ...
Page 105: ...Appendix B Circuit Diagrams B 8 ACA 635 IGBT Supply Sections ...
Page 106: ...Appendix B Circuit Diagrams ACA 635 IGBT Supply Sections B 9 ...
Page 107: ...Appendix B Circuit Diagrams B 10 ACA 635 IGBT Supply Sections ...
Page 108: ......
