Lenze EVF9333−xV - Manual (Page 89)

Wiring of the standard device
Notes on project planning
Optimisation of the controller and mains load
5
5.2
5.2.7
l
5.2−5 EDSVF9333V EN 6.2−04/2012
5.2.7 Optimisation of the controller and mains load
A mains choke is an inductance which can be included in the mains cable of
the frequency inverter. As a result, the load of the supplying mains and the
controller is optimised:
ƒ Reduced system perturbation: The curved shape of the mains current
approaches a sinusoidal shape.
ƒ Reduced mains current: The effective mains current is reduced, i.e. the
mains, cable, and fuse loads are reduced.
ƒ Increased service life of the controller: The electrolytic capacitors in the
DC bus have a considerably increased service life due to the reduced AC
current load.
There are no restrictions for the combinations of mains chokes and RFI filters
and/or motor filters. Alternatively, a mains filter can be used (combination
of mains choke and RFI filter in a common housing).
)
Note!
ƒ Some controllers must generally be operated with a mains
choke or a mains filter.
ƒ If a mains choke or a mains filter is used, the maximum
possible output voltage does not reach the value of the mains
voltage (typical voltage drop at the rated point 4 ... 6 %).