GB - 19
4.2.5
Hints for EMC Conform Wiring
• Install the cabinet or system correctly
• In order to prevent noise inter ferences
a) Mains / supply lines,
b) Motor lines from inverters and servo controllers
c) Control and data lines (low voltage levels < 48 V), must have a clearance
of at least 15 cm when intalled.
• 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, with a large
contact surface. Use earthing and equipotential lines with a section as large
as possible (min. 10 mm²) or use thick earthing strips.
• If external interference suppression filters are used, then these must be installed
as close as possible to (<30cmfrom) the interference source and in metal-to-
metal contact with the mounting plate, with a large contact surface.
• 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 lines work as active and passive antennas.
• Shielded cables should be used if the connecting lines between interference
suppression filter and commutating choke or commutating choke and R4-S-
regenerative unit are longer than 30 cm. The maximum length of this lines is
1 m.
• Keep connection cables straight (do not bundle). Connect all non-assigned
wire on both sides to the protective conductor.
• The flow and return circuit must be twisted when the lines are not shielded, in
order to dampen common-mode noise.
See the following pages for a correct intallation and wiring of an EMC control
cabinet.
Installation
