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3.3 Electro-magnetic Compatibilty Standards
The regulated standard in accordance with conformity of electromagnetic compatiibilty is summarized in
Italian Regulation CEI EN 61800 (complete).
MiniAx conformity is assured only if it is installed following the precise assembly criteria expressed below:
The fundamental assembly characteristics are summarized below:
1) Use of appropriate network filters to filter the line (transformer input), from disturbances conducted or
produced by the drive.
A series of filters released by CONTROL TECHNIQUES are available for this purpose.
2) Use of shielded cables, both for power connection (to the transformer and the motor), and for signal
connection (also to the controller).
3) Using the separation of cables technique. (Separate power cables from signal cables).
4) the correct ground connection of predisposed parts.
Network filters
Of all of the mentioned sistems, the use of network filters is without a doubt fundamental in suppressing
disturbances.
During product testing Control Techniques found optimal solutions for their products. Other eveutual choices
of filtering by End-Users cannot be guaranteed by CONTROL TECHNIQUES.
Below is a graphic example of disturbance levels measured with and without using the type of filter indicated
in the following pages.
These filters are produced by SCHAFFNER. Other products with the same characteristics may be sufficient,
but have not been tested or evaluated by CONTROL TECHNIQUES.
In choosing the filter, we also considered the current absorption of its connecting devices. CONTROL
TECHNIQUES recommends connecting the filter before the power supply transformer. This method,
besides offering better disturbance suppression results, also allows for the use of filters capable of
supporting a lot less current, consequently they're cheaper.(takes advantage of the transformers ratio).
Follow the formula below for the filter dimensions for use with the MiniAx.
I(A)= P tot. / ( 1.73 * 380 )
Where:
--I is the net current expressed in Amperes for the necessary filter.
--380 is the 3 Phase Transformer primary voltage.
--P tot. is the motor's max. power absorption in VA.
P(VA)=Motor 1 power absorption + Motor 2 power absorption + .....etc.
Withou t filter
With filter
Rule Lim it
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