Input chokes
Contents of this chapter
This chapter describes how to select and install input chokes for the drive. The
chapter also contains the technical data of the input chokes.
When is an input choke necessary?
Determine the need for an external input choke at the drive power input on a
case-by-case basis. The input chokes are used:
• to protect the drive in networks with high short-circuit capacity. Refer to Input
choke (page 167) in sectionElectrical power network specification (page 166).
• to reduce harmonic current emissions. Refer to Compliance with the harmonic
current limits in a public network (IEC/EN 61000 3-2, IEC/EN
61000-3-12) (page 177).
• to reduce the rms value of input current. Refer to Maximum input
current (page 205).
• to reduce supply disturbance and low-frequency interference
• in common DC configurations.
Maximum input current
Input current (
I
1
) of the drive depends on these items:
• motor actual shaft power and efficiency
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Input chokes 205
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