ABB ACS800-04 - Non-ABB Du;Dt Filter Selection; What this Chapter Contains; When a Du;Dt Filter Must be Used; Filter and Installation Requirements

Non-ABB du/dt filter selection 139
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Non-ABB d u /d t filter selection
What this chapter contains
This chapter contains guidelines for selecting and installing a non-ABB d u /d t filter
with the drive.
When a d u /d t filter must be used
A d u /d t filter must be used with drives of voltages from 500 V to 690 V according to
the
Requirements table on page 40.
Filter and installation requirements
1. The filter is an LCR filter or an L filter (a series inductor: three single-phase
inductors or one three-phase inductor).
Make sure that the approximate per-phase impedance of the filter inductor is
1.5% for drives of frame size R7 and 2% for drives of frame size R8 when
calculated as follows:
where
Z
L
impedance of the inductor divided by the nominal phase impedance of the motor, in
percentage
L per-phase inductance of the filter
f
N
rated motor frequency
I
N
rated motor current
U
N
rated motor voltage.
Z
L
2  f
N
L
3 I
N

U
N
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