Basics for wiring according to EMC
Installation in the control cabinet
6
Basic unit wiring
6.3
6.3.3
L
6.3-4
EDS82EV903-1.0-11/2002
l
Control cables and mains cables must be separated from the motor cable.
l Install separate terminals for the motor cables at the control cabinet entry
with a minimum distance from the other terminals of at least 100 mm.
l The cables must always be layed close to the mounting plate (reference
potential), as loose cables act like aerials.
l The cables must be routed in a straight line to the terminals (avoid “tangle
of cables”)!
l Use a separate cable duct for mains cables and control cables. Do not mix
up different types of cables in one cable duct.
l Never lay motor cables in parallel with mains cables and control cables.
l Cross the motor cable vertically with mains cables and control cables.
l 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.
l Minimise coupling capacitances and inductances due to unnecessary cable
lengths and reserve loops.
l Short-circuit cable ends of unused cables to the reference potential.
l Connect all components (controller, RFI filter, filter, choke) to one central
ground point (mounting plate of the control cabinet).
l Set up a star-shape grounding system.
l Comply with the corresponding minimum cable cross-sections.
Optimum cable routing
Grounding system
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