DOK-INDRV*-HCS02*UL
***-1803-EN-P
Bosch
Rexroth
AG
57/69
Rexroth
lndraD
r
ive
Drive
Controllers
Power
Sections
HCS02
EMC Measures for Design and Installation
Metal
Surfaces
Always use connection elements (screws, nuts, plain washers) with good elec-
troconductive surface.
Bare zinc-coated or tinned
metal surfaces have
good
electroconductive
prop-
erties.
Anodized, yellow chromatized, black gunmetal finish or lacquered metal surfa-
ces have
bad
electroconductive
properties.
Ground
Wires
and
Shield
Connec-
For connecting ground wires and shield connections,
it
is
not the cross section
tions
but the size
of
contact surface that
is
important, as the high-frequency interfer-
ence currents
mainly flow
on
the surface
of
the conductor.
Always connect cable shields, especially shields
of
the motor power cables, to
ground
potential over a large surface area.
6.4
Installing
Signal
Lines
and
Signal
Cables
Line
Routing
For measures to prevent interference, see the Project Planning Manuals of the
respective device.
In
addition,
we
recommend the following measures:
• Route signal and control lines separately from the power cables with a
minimum distance of
d5
=
100
mm
(see 6.2.2 Division
In
to Areas
(Zones), page
50
) or with a grounded separating sheet. The optimum way
is
to route them
in
separate cable ducts. If possible, lead signal lines into
the
control cabinet at one point only.
• If signal lines
are crossing power cables, route them
in
an
angle of goo
in
order to avoid interference injection.
• Ground spare cables, that are not used and have been connected, at least
at both ends
so
that they do not have any antenna effect.
• Avoid unnecessary line lengths.
•
Run
cables as close as possible to grounded metal surfaces (reference
potential). The ideal solution are closed, grounded cable ducts or metal
pipes which, however,
is
only obligatory for high requirements (sensitive
instrument
leads).
•
Avoid suspended lines or lines routed along synthetic carriers, because
they are functioning
like reception antennas (noise immunity) and like
transmitting antennas (emission of interference). Exceptional cases are
flexible cable tracks over short distances
of
a maximum
of
5 m.
Shielding
Connect the cable shield immediately at the devices
in
the shortest and most
direct
possible way and over the largest possible surface area.
Connect the
shield of
analog
signal
lines
at one end over a large surface area,
normally
in
the control cabinet at the analog device. Make sure the connection
to ground/housing
is
short and over a large surface area.
Connect the
shield of
digital
signal
lines
at both ends over a large surface area
and
in
short form.
In
the case
of
potential differences between beginning and
end of the
line, run
an
additional bonding conductor
in
parallel. This prevents
compensating current from
flowing via the shield. The guide value for the cross
section
is
10
mm
2
.
You absolutely have to equip separable connections with connectors with
grounded
metal housing.
In the case
of
non-shielded lines belonging to the same circuit, twist feeder and
return
cable.
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