Schaffner Group
User and Installation Manual
LCL Filter
May 2018
13/21
3.7 LCL filter FN6840 footprint
Figure 3: Mechanical Data of FN 6840
Table 2: Dimensions of all frame sizes
3.8 LCL Filter performance
The LCL filter can achieve it’s performance, if the LCL filter FN6840 specification is suitable to the
application requirements. Additional prerequisites are that the line side is supplied by a main isolation
transformer and that the grid impedance is
≥
1%. Under those conditions and within the kept filter
specifications the remaining ripple current is < 5% (max.ripple current
pk-pk
vs fundamental
pk-pk
)
.
THDi according EN61000-3-12 is <5% in any case. This value shall be used just for reference only as
that standard is not applicable for LCL filter applications.
Schaffner strongly recommends, that the LCL filter version with damping module/resistors are used in
case the AFE motor drive or AIC has no active damping function. Only in case the drive has a working
active damping function, an LCL filter without a damping module would be tolerable.
3.9 Drive settings
The performance (stability, ripple current, phase shift) is highly dependent on the control parameters.
The setting of the parameter must be advised or done by a technical expert.
It is not Schaffner’s responsibility to set up the drive correctly to make the system work properly.
INS 1008766 A0
INS 1008766 A0
INS 1008766 A
