KEB COMBIVERT M4, Instruction Manual, Page: 54 / 80

GB - 16
3.5 Instructions for EMC-conform wiring
• In order to prevent noise crosstalk
a) Mains/supply lines
b) Motor lines from inverters and servo controllers
c) Control and data lines (low voltage levels < 48V)
must have a clearance of at least 15 cm when installed.
• In order to maintain low-resistance high frequency connections, earthing and
shielding, as well as other metallic connections (e.g. mounting plate, installed
units) must be in metal-to-metal contact with the mounting plate, over as large
an area as possible. Use earthing and equipotential lines with a section as
large as possible (min. 10mm
2 ) or use thick earthing strips.
• If external interference suppression filters are used, then these must be installed
as close as possible to (<30cm from) the interference source and in metal-to-
metal contact with the mouting plate, over as large an area as possible.
• Always equip inductive control elements (contactors, relays etc.) with
suppressors such as varistors, RC-elements or damping diodes.
• All connections must be kept as short as possible and as close as possible to
the earth, as free floating lines work as active and passive aerials.
• Keep connection cables straight (do not bundle). Install a non-assigned wire
on both sides of the protective conductor.
• The flow and return circuit must be twisted when the lines are not shielded, in
order to dampen common-mode noise.
• For shielded lines always use metal cable glands with shield lacing.
Installation