6 EMC Measures for Design and Installation
6.1 Rules for Design of Installations With Drive Controllers in
Compliance With EMC
The following rules are the basics for designing and installing drives in compliance with
EMC.
Mains Filter
Correctly use a mains filter recommended by Rexroth for radio interference suppres‐
sion in the supply feeder of the drive system.
Control Cabinet Grounding
Connect all metal parts of the cabinet with one another over the largest possible sur‐
face area to establish a good electrical connection. This, too, applies to the mounting of
the mains filter. If required, use serrated washers which cut through the paint surface.
Connect the cabinet door to the control cabinet using the shortest possible grounding
straps.
Line Routing
Avoid coupling routes between lines with high potential of noise and noise-free lines;
therefore, signal, mains and motor lines and power cables have to be routed separately
from another. Minimum distance: 10 cm. Provide separating sheets between power and
signal lines. Ground separating sheets several times.
The lines with high potential of noise include:
● Lines at the mains connection (incl. synchronization connection)
● Lines at the motor connection
Lines at the DC bus connection
Generally, interference injections are reduced by routing cables close to grounded
sheet steel plates. For this reason, cables and wires should not be routed freely in the
cabinet, but close to the cabinet housing or mounting panels. Separate the incoming
and outgoing cables of the radio interference suppression filter.
Interference Suppression Elements
Provide the following components in the control cabinet with interference suppression
combinations:
● Contactors
● Input and output reactors
● Input filters
● Ferrite magnetic ring
Connect these combinations directly at each coil.
Bosch Rexroth AG
EMC Measures for Design and Installation
DOK-RCON01-REX*F*UL***-IN01-EN-P
Rexroth Frequency Converters
54/65
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