Lenze Inverter EMC - Manual (Page 14)

Arrangement according to EMC requirements
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EDBEMV EN 1.3
6.2 In the control cabinet
6.2.1 Mounting plate characteristics
z Use mounting plates with an electrically conductive surface (zinc-coated or V2A).
z Varnished mounting plates are unsuitable, even if the varnish is removed from the contact
surfaces.
z When using several mounting plates, make a conductive connection over a large surface (e.g.
using grounding strips).
6.2.2 Mounting of the components
z Connect the controller and RFI filter to the grounded mounting plate with a surface as large as
possible.
z No DIN rail mounting!
6.2.3 Correct cable installation
z Control cables and mains cables must be separated from the motor cable.
z Install terminals for the motor cables e.g. at the control cabinet entry with a minimum
distance from the other terminals of at least 100 mm.
z The cables must always be installed close to the mounting plate (reference potential), as
loose cables act like aerials.
z The cables must be routed in a straight line to the terminals (avoid “ tangle of cables” )!
z Use a separate cable duct for mains cables and control cables. Do not mix different cable
types in one cable duct.
z Never lay motor cables in parallel with mains cables and control cables.
z Cross the motor cable vertically with mains cables and control cables.
z Twist unshielded cables of the same circuit (go-and-return line) and ensure that the area
between go-and-return-line is as small as possible.
z Reduce coupling capacitances and inductances due to unnecessary cable lengths and
reserve loops.
z Short-circuit cable ends of unused cables to the reference potential.
6.2.4 Earth connection
z Connect all components (controller, RFI filter, filter, chokes) to a central earthing point (PE rail).
z Set up a star-shape earthing system.
z Comply with the corresponding minimum cable cross-sections.
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