Input Filter; Basic Definitions - WEG CFW-11 RB User Manual

Installation and Connection
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
3
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 reactor). It is used an additional LC
BOOST
filter between the L and the power supply in order to eliminate the high frequency currents flow generated by
BOOST
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.
Input filter
Lf L
BOOST
R
AT/BT
U,V,W
Regenerative Output
Motor
C
converter inverter
U,V,W
Point of common
coupling
Panel
Figure 3.22: Filter simplified connection diagram
CFW-11 RB | 3-27