DOK-INDRV*-HCS02*UL
***-1803-EN-P
Bosch
Rexroth
AG
49/69
Rexroth
lndraDrive
Drive
Controllers
Power
Sections
HCS02
EMC Measures for Design and Installation
6 EMC Measures
for
Design
and
Installation
6.1
Rules
for
Design
of
Installations
With
Drive
Controllers
in
Com-
pliance
With
EMC
The following rules are the basics for designing and installing drives
in
compli-
ance with EMC.
Mains
Filter Correctly use a mains filter recommended by Rexroth for radio interference
suppression
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
surface 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 usi
ng
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
em.
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
groun-
ded 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. Sep-
arate the incoming and outgoing cables of the radio interference suppression
filter.
Interference
Suppression
Elements
Provide the following components
in
the control cabinet with interference sup-
pression combinations:
• Contactors
• Relays
• Solenoid valves
• Electromechanical operating hours counters
Connect these combinations directly at each coil.
Twisted
Wires
Twist unshielded wires belonging to the same circuit (feeder and return cable)
or keep the surface between feeder and return cable as small as possible. Wires
that are not used have to be grounded at both ends.
Lines
of
Measuring
Systems
Lines of measuring systems must be shielded. Connect the shield to ground at
both ends and over the largest possible surface area. The shield may not be
interrupted, e.g. using intermediate terminals.
Digital
Signal
Lines
Ground the shields of digital signal lines at both ends (transmitter and receiver)
over the largest possible surface area and with low impedance.
In
the case
of
bad ground connection between transmitter and receiver, additionally route a
bonding
co
nductor (min.
10
mm
2
) .
Braided shields are better than foil shields.
Analog
Signal
Lines
Ground the shields of analog signal lines at one end (transmitter
or
receiver)
over the largest possible surface area and with low impedance. This avoids low-
frequency interference current (in the mains frequency range)
on
the shield.
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