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BUS データシート(PDF) 26 Page - Christian Bürkert GmbH & Co. KG

部品番号 BUS
部品情報  Bürkert System Bus
PDF  42 Pages
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メーカー  BURKERT [Christian Bürkert GmbH & Co. KG]
ホームページ  https://www.burkert.com/en
Logo BURKERT - Christian Bürkert GmbH & Co. KG

BUS データシート(HTML) 26 Page - Christian Bürkert GmbH & Co. KG

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Type büS
büS network shielding
26
11
11.1
büS NETWORK SHIELDING
Shielding of EDIP devices
Detailed shielding information for each device can be found in pin assignment of technical data sheet and
operating instructions. There are three types of device-internal shieldings:
Direct: Direct connection of shield to FE
Device
(Direct)
büS cable shield
Functional earth (FE)
RC: Parallel connection of resistor and capacitor to
FE
Device
(RC)
büS cable shield
Functional earth (FE)
None: No shield connection
Device
(None)
büS cable shield
Shield end
is floating!
Device has no
functional earth (FE)
to connect!
Tab. 6: büS network shielding
11.2
Comparison of shieldings
Shielding
Reasons for/when using
Restrictions for installation or disadvant-
ages
DIRECT
Connection of
shield to FE
▪ Best shielding effect
▪ Metal housing (e.g. stainless steel for
“clean design”)
Equipotential FE grounding system in
plant is mandatory.
RC
Parallel connection
of resistor and ca-
pacitor to FE
▪ Second best shielding effect
▪ Also practicable when FE quality is
poor
▪ Recommended shielding for safety
applications to prevent compensation
currents
Shielding effect may not be sufficient in
very rough H-field emitting environments.
NONE
No FE on device available (e.g. due to
customer requirement)
To have any shielding effect, cable shield
must always led near by device with no
significant stiches (stubs). The shielding
is carried out on subsequent or adjacent
devices.
Tab. 7: Comparison



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