Selecting the du/dt filter
9
Selecting the du/dt filter
What this chapter contains
The chapter instructs in selecting a du/dt filter for your drive.
Filter selection procedure
1)
For the ACS800 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
.
Applicability checks of the pre-selected filter
Long or several parallel motor cables, or special cable types may cause excessive
temperature rise in the filter. Therefore, check that the pre-selected filter fulfils these
general requirements valid for every installation:
•
The motor cable length does not exceed the maximum allowed length. The
maximum length is given in the
Hardware manua
l of the drive. For some filter
types the length is still restricted independent on the drive type. Check the
maximum values in section
General notes and restrictions
.
•
The energy loss in the du/dt filter does not exceed the maximum heat dissipation
capacity of the filter (
E
max
dissipation capacity of the filter
below. The energy loss is calculated as follows:
E
= ½ · C · (
U
dc
)
2
where
•
The current through the filter does not exceed the maximum value given in
subsection
Maximum current and heat dissipation capacity of the filter
below
.
Step
What to do
More information
1.
Check whether a du/dt filter
is needed in the installation.
The requirements are specified in the drive
Hardware
manual
. See chapter
Planning the electrical installation
,
section
Selecting the motor
, and chapter
du/dt filter
.
1)
2.
Pre-select a filter according
to the drive type.
Filter selection tables are in the drive
Hardware manual
.
1)
The pre-selected filter is suitable for most applications.
3.
Check that the pre-selected
filter is suitable for your
application.
Applicability checks of the pre-selected filter
below.
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.
E
energy loss in the du/dt filter
C
total capacitance of the motor cable(s), i.e. the product of the capacitance/length value
given in the cable catalogue and the length of the motor cable. In case of parallel motor
cables, the total capacitance is the sum of the individual cable capacitance.
U
dc
average intermediate circuit DC voltage of the drive = approximately 1.35 ·
U
N
U
N
supply voltage.
=
=
=
=
Содержание NOCH0070-6 Series
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Страница 6: ...About this manual 6 ...
Страница 14: ...Installation 14 Power connection diagrams NOCH0260 60 NOCH0400 60 NOCH0760 60 NOCH0400 60 ...
Страница 16: ...Installation 16 NOCH0760 60 ...
Страница 17: ...Installation 17 NOCH0400 60 ...
Страница 18: ...Installation 18 NOCH0400 60 ...
Страница 19: ...Installation 19 AOCH0400 70 AOCH0260 70 ...
Страница 25: ...Dimension drawings 25 AOCH0400 70 single phase filter du dt kit includes 3 pieces of single phase filters ...
Страница 27: ...Dimension drawings 27 NOCH0120 60 NOCH0260 60 and NOCH0400 60 du dt kits include 3 filters ...
Страница 28: ...Dimension drawings 28 NOCH0760 60 Weight 43 kg 95 lbs 1 1 2 1 1 2 2 2 du dt filter kit includes 3 filters ...
Страница 29: ...Dimension drawings 29 ...