Lenze E82xVxxxKxxxxx - Manual (Page 104)

Electrical installation
Notes on project planning
Reduction of noise emissions
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104 EDS82EV903 EN 3.0
6.2.7 Reduction of noise emissions
Due to internal switching operations, every controller causes noise emissions which may
interfere with the functions of other consumers. Depending on the site of the frequency
inverter, European standard EN 61800−3 defines limit values for these noise emissions:
Limit class C2: Limit class C2 is often required for industrial mains which are isolated from
the mains of residential areas.
Limit class C1: If the controller is operated in a residential area, it may interfere with other
devices such as radio and television receivers. Here, interference suppression measures
according to limit class C1 are often required.
Limit class C1 is much more strict than limit class C2. Limit class C1 includes limit class C2.
For compliance with limit class C1 / C2, corresponding measures for the limitation of noise
emissions are required, e.g. the use of RFI filters.
There are no restrictions for the combinations of RFI filters and mains chokes and/or motor
filters. Alternatively, a mains filter can be used (combination of mains choke and RFI filter
in a common housing).
The selection of the frequency inverter and the corresponding filters, if applicable, always
depends on the application in question and is determined by e.g. the switching frequency
of the controller, the motor cable length, or the protective circuit (e.g. earth−leakage circuit
breakers).
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Note!
ƒ Some controllers must generally be operated with a mains choke or a mains
filter.
ƒ Some controller variants have a factory−set RFI filter (EMC filter) or mains
filter. Additional mains chokes or filters must not be used in conjunction
with a mains filter.
ƒ During operation with a mains choke or a mains filter, the maximally
possible output voltage does not reach the mains voltage value (typical
voltage drop at the rated point: 4 ... 6 %).