ABB ACS880 Manual page 26

26 Planning the drive system
The diagram below shows a test bench setup for electric vehicle motor converters. The
converter and motor under test (EUT) is fed from a multidrive drive system through a DC/DC
converter (DDC) that simulates a battery. The load motor is controlled by an inverter unit
(INU) in the same drive system. The braking energy received from either motor is fed back
to the DC bus of the drive, and is available for the other motor. In normal operation, the
IGBT supply unit (ISU) only needs to compensate for the internal losses within the drive,
and can be dimensioned for a lower power rating than the INU (or the ISU in the previous
example). However, in an emergency stop situation, the ISU must be able to handle the
power that is needed for stopping the motors unless other means (such as a brake chopper)
are present. The ISU must also be able to supply enough power for the motors for a
successful identification (ID) run.
ACS880
DC bus
–
ACS880-207-... ACS880-107-... ACS880-1607-...
INU DDC
ISU
BLHF
3
EUT
Load motor
3
M
M
Enc
AC supply
3~