Lenze EVS9332xK - Manual (Page 86)

Wiring of the standard device
Notes on project planning
Reduction of noise emissions
5
5.2
5.2.8
l
5.2−6 EDSVS9332K EN 8.0−07/2013
5.2.8 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).
)
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 %).
The graphics below illustrates the maximum possible motor cable length
based on the type of filter and the resulting interference voltage category
according to EN 61800−3. Depending on the used motor cable, the used
controller, and its switching frequency, the mentioned maximum motor
cable lengths may vary.