Lenze Inverter EMC - Manual (Page 9)

EMC interference injections
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EDBEMV EN 1.3
4 EMC interference injections
The injection of EMC interference is characterised by different coupling mechanisms. The
respective coupling mechanism is the “ transmission path“ between interference source and
potentially susceptible equipment.
There are 4 different coupling mechanisms:
E l e c t r o m a g n e t i c e n v i r o n m e n t
( i n t e r f e r e n c e s o u r c e )
R e c e i v e r ( p o t e n t i a l l y
s u s c e p t i b l e e q u i p m e n t )
C o n d u c t i v e
c o u p l i n g
C a p a c i t i v e
c o u p l i n g
I n d u c t i v e
c o u p l i n g
R a d i a n t
c o u p l i n g *
* Combination of capacitive and inductive coupling
Fig. 4 EMC: Coupling mechanisms
The degree of intensity of the interference injection may be reduced by various different measures:
At the transmitter
• Shielding
• Filters
I n t e r f e r e n c e s o u r c e
( e m i t t e r )
P o t e n t i a l l y s u s c e p t i b l e
e q u i p m e n t ( r e c e i v e r )
C o u p l i n g m e c h a n i s m
( p a t h )
At the coupling mechanism
• Shielding
• Topology
• Optical waveguide (electrical isolation)
I n t e r f e r e n c e s o u r c e
( e m i t t e r )
P o t e n t i a l l y s u s c e p t i b l e
e q u i p m e n t ( r e c e i v e r )
C o u p l i n g m e c h a n i s m
( p a t h )
At the receiver
• Shielding
• Filters
• Circuitry arrangement
I n t e r f e r e n c e s o u r c e
( e m i t t e r )
P o t e n t i a l l y s u s c e p t i b l e
e q u i p m e n t ( r e c e i v e r )
C o u p l i n g m e c h a n i s m
( p a t h )
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