Bosch REXROTH IndraControl VEH 30.2, Руководство по планированию проекта

Страница: 47 / 112

Gerät
Schellen für
Schirmkontaktierung
Netzfilter
Netzkabel außerhalb
des Gerätes (geschirmt
oder ungeschirmt)
Schirm ist in diesem Abschnitt erforderlich!
L, N und PE - möglichst kurz!
an das Gehäuse
flächig kontaktiertes
Netzfilter
Fig.4-7: Correct connection of a compact line filter within the device
If the line filter is placed outside the shielded housing, the device connection
line must be shielded from the line filter through to the shielded housing of
the device and the cable shield must be contacted on both ends. This pre‐
vents interference produced by the device from being transmitted externally
where it could penetrate other systems. It also prevents the penetration of in‐
terference signals back into connection wires that have already been filtered.
Netzkabel
(ungeschirmt)
flächig kontaktiertes
Netzfilter
Netzfilter
Schellen für
Schirm-
kontaktierung
L, N und PE -
möglichst kurz! Schirm ist in diesem
Abschnitt erforderlich!
Gerät
Schirmgehäuse
des Gerätes
Fig.4-8: Correct connection of a compact line filter outside the device
When connecting line filters, attention should first be paid to the frequency
ranges to be filtered. If frequencies in the MHz range are also to be filtered,
such a line filter must feature a metal housing. Line filters with plastic hous‐
ings are normally not suitable for this purpose.
Current-compensated chokes
Device manufacturers sometimes specify the use of current-compensating
chokes or the installation of ferrite loops in the power supply line. Many ex‐
amples of this can be found in motor lines that are fed by frequency inverters.
Such chokes (see fig. 4-9 "Current flow of a current-compensating choke" on
page 46 ) suppress common-mode interference currents (I
S
) and allow the
operating currents (I
B
) to pass unhindered. Observe that the operating cur‐
rents in the core produce self-cancelling magnetic fields so that the operating
current does not saturate the ferrite cores. Such throttles must also be placed
at the inlet to the shielded housing of the device.
DOK-SUPPL*-VEH*30.2***-PR03-EN-P
Rexroth IndraControl VEH 30.2 Hand-Held Terminal Bosch Rexroth AG 45/109
Technical Data