Exu - Excitation Unit (Optional); Figure 3-19 Exu - ABB ACS5000 User Manual

3.7. EXU – Excitation unit (optional)
The EXU supplies a synchronous motor with excitation power. The EXU is available
for the following excitation methods:
– Brush excitation (DC excitation): Brush excitation uses a DCS800 AC-to-DC
converter (see figure below) which is supplied by the mains. The converter
controls the direct current for generating the magnetic field. Brushes and slip-
rings feed the DC current to the rotor.
– Brushless excitation (AC excitation): Brushless excitation uses a three-phase
DCS800 AC-power controller (see figure below). The power controller feeds an
exciter which is mounted on the shaft of the main motor. The rotating
armature of the exciter supplies a rectifier which generates the DC current for
producing the magnetic field in the synchronous motor.

Figure 3-19 EXU

1) AC-to-DC converter
2) Output disconnector (option)
PRODUCT
ACS5000W
1
DOCUMENT KIND
User manual
POWER ELECTRONICS AND CABINET FEATURES
3) AC power controller
DOCUMENT ID.
3BHS799208 E01
2
3
REV. LANG. PAGE
F en 51/178