3
Installation and Connection
CFW-11 RB | 3-27
CFW-11 RB nº1 CFW-11 RB nº2 CFW-11 RB nºN CFW-11 RB nº1 CFW-11 RB nº2
Internal cabinet ground
bus bar
Figure 3.21: Grounding connections with multiple converters
3.2.6 Input Filter
3.2.6.1 Basic Definitions
The proper operation of the regenerative converter demands the use of a three-phase reactance between the input
and the power supply. This three-phase reactance is known as L
BOOST
(boost reactor). It is used an additional LC
filter between the L
BOOST
and the power supply in order to eliminate the high frequency currents flow generated by
the IGBTs switching to the power supply. In this manual, the components connected between the power supply
and the regenerative converter are identified as filters.
The input filter is the connection of two three-phase inductances (L1 and L2) between the power supply and the U, V and
W terminals of the regenerative converter. Among these inductance is a branch with capacitors and damping resistors.
Regenerative
converter
Point of common
coupling
Output
inverter
AT/BT
Panel
High voltage power supply
Low voltage power supply
Outras cargas
Motor
Input filter
L
BOOST
Lf
R
U,V,W
C
U,V,W
Figure 3.22: Filter simplified connection diagram
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