ABB FOCH, Hardware Manual, Page: 13 / 38

Selecting the d u /d t filter
Contents of this chapter
The chapter instructs in selecting a d u/dt filter for your drive.
Filter selection procedure
More information What to do Step
The requirements are specified in the drive hardware manual.
See chapter Planning the electrical installation.
1)
Check whether a d u/dt filter
is needed in the installation.
1
Filter selection tables are in the drive hardware manual.
1)
Pre-select a filter according
to the drive type. 2
See section Applicability checks of the pre-selected filter. Check that the pre-selected
filter is suitable for your ap-
plication. 3
If the checks are passed, use the pre-selected filter. If any of the
conditions is not met, choose a bigger filter, use two filters in
series or change the motor cabling.
2)
1) For the ACS880 drives, the data can be found either from the appropriate Technical catalog or Hardware manual.
The PDF files are available at www.abb.com/drives .
2) FOCH0260-7x cannot be replaced with a bigger filter due to the higher inductance in the FOCH0260-7x.
Applicability checks of the pre-selected filter
Long or several parallel motor cables, or special cable types may cause additional
temperature rise in the filter. Therefore, check that the filter selected on the basis of
the filter selection table fulfils the application requirements:
• The motor cable is not longer than the maximum allowed motor cable length given
in the drive hardware manual.
• The energy loss in the d
u/dt filter is not higher than the maximum allowed value
( E
max
) given in subsection Maximum values table (page 14) below. The energy loss
is calculated as follows:
3
Selecting the d u/dt filter 13