01/02 AWB8230-1415GB
Connecting to the mains
17
Mains choke
The mains choke (also called commutating choke or line reactor)
is connected to the mains side input cables L1, L2, L3. It reduces
the harmonics and therefore reduces the apparent mains current
by up to 30 %.
A mains choke also limits any current peaks caused by potential
dips (e.g. caused by p.f. correction equipment or earth faults) or
switching operations on the mains.
The mains choke increases the lifespan of the internal DC link
capacitors and therefore the lifespan of the frequency inverter. Its
use is also recommended:
• with derating (temperatures above +40 °C, sites of installation
more than 1000 m above sea level),
• with parallel operation of multiple frequency inverters on a
single mains supply point,
• with DC link coupling of multiple frequency inverters (intercon-
nected operation).
Mains chokes and their assignment to the DV6 frequency inverters
are listed in the appendix, Section “Mains choke“, Page 196.
Mains filters and radio interference filters
Mains filters are a combination of mains chokes and radio interfe-
rence filters in a single enclosure. They reduce the current harmo-
nics and dampen high frequency radio interference levels.
Radio interference filters only dampen high frequency radio inter-
ference levels.
Caution!
The mains phase failure detection (PNU b006) does not
operate correctly when a radio interference filter is
installed.
Caution!
When line filters or radio interference filters are used, the
leakage current to earth increases. Observe this point
when installing residual-current circuit breakers.
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