Exu - Excitation Unit (Optional); Fig. 21. (A) Exu H4/T4 Frame Cabinet And (B) Exu H6 Frame Cabinet - 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): Uses a DCS880 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 DCT880 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.
A
1
2
2
Key:
(1) Ground fault detection device (optional)
(2) Fuses
(3) Control compartment
(4) Fan units

Fig. 21. (A) EXU H4/T4 frame cabinet and (B) EXU H6 frame cabinet

PRODUCT
ACS5000W gen. 2
3
4
5
DOCUMENT KIND
User manual
POWER ELECTRONICS AND CABINET FEATURES
B
3
7
(5) DCS880/DCT880 H4 unit
(6) Overvoltage protection (not shown in A)
(7) DCS880 H6 unit
DOCUMENT ID.
3BHS799208 E01
1
6
4
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