POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
67/266
3.3.5. Excitation unit (EXU)
The EXU supplies a synchronous motor with excitation power. The EXU is available
for the following excitation methods:
– Brush excitation (DC excitation): Uses a DCS800 AC-to-DC converter 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): Uses a three-phase DCS800 AC-power
controller. 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.
For more information, see “Air-cooled excitation units, brush brushless excitation
technical data” (3BHS299399 E01).
Figure 3-25 EXU D4 frame cabinet (A) and EXU D5 frame cabinet (B)
1) Ground fault detection device (optional)
2) Fuses
3) Control compartment
4) Fan units
5) DCS800 D4 unit
6) Overvoltage protection (not shown in A)
7) DCS800 D5 unit
1
1
2
2
5
6
7
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