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DOK-INDRV*-HCS02*UL
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Rexroth lndraDrive Drive Controllers Power Sections HCS02
EMC Measures for Design and Installation
6.5
General
Measures
of
Radio
Interference
Suppression
for
Re-
lays,
Contactors,
Switches,
Chokes
and
Inductive
Loads
If,
in
conjunction with electronic devices and components, inductive loads, such
as
chokes, contactors, relays are switched by contacts or semiconductors, ap-
propriate interference suppression has to
be
provided for them:
• By arranging free-wheeling diodes
in
the case
of
d.c. operation
•
In
the case of a.c. operation, by arranging usual
RC
interference suppres-
sion elements depending
on
the contactor type, immediately at the induc-
tance
Only the interference suppression element arranged immediately at the induc-
tance does serve this purpose. Otherwise, the emitted noise level
is
too high
which can affect the function
of
the electronic system and of the drive.
If possible, mechanical switches and contacts should only
be
realized as snap
contacts. Contact pressure and contact material must
be
suited for the corre-
sponding switching currents.
Slow-acti
on
contacts should
be
replaced by snap switches or by solid-state
switches, because slow-action contacts strongly bounce and are
in
an
unde-
fined switching status for a long time which emits electromagnetic waves
in
the
case
of
inductive loads. These waves are
an
especially critical aspect
in
the
case
of
manometric or temperature switches.
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