ABB ACS6000 - Excitation Unit (EXU); EXU D4 Frame Cabinet (A) and EXU D5 Frame Cabinet (B)

3BHS212794 E01 REV M ACS6000 USER MANUAL 77/278
03 POWER ELECTRONICS AND CABINET FEATURES
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.
Note: For more information, see "Air-cooled excitation units, brush
brushless excitation technical data" (3BHS299399 E01).
Figure 3-30 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
AABB
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