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Bosch Rexroth AG
Technical Data
Preventing couplings
4.13.4
EMC MeasuresIndraControl VEH 30.2
①
Supply lines
②
Ferrite loop
I
Interference current
S
I
Operating current
B
Fig.4-9:
Current flow of a current-compensating choke
Ferrite
Ferrites operating via data lines work in a similar way like current-compensat‐
ing chokes. The wanted signals (see figure) can pass unhindered and the in‐
terference signals are attenuated. A fundamental difference from current-
compensating chokes is that in the case of ferrites the field of application
takes place at higher frequencies. Therefore the material losses are responsi‐
ble for the attenuation and the interference is not reflected, as in the case of
inductance, but is converted into heat.
①
Ferrite
②
Data line
I
Interference current
S
I
Operating current
B
Fig.4-10:
Current flow for ferrites
Coupling between interference sensitive signals (e.g. analog signals) and the
lines that carry the interference signals (e.g. motor lines) can be reduced by
laying cables separately.
The IndraControl VEH 30.2 is designed for industrial applications. Considera‐
ble electromagnetic and electrostatic interference can occur in this environ‐
ment. For this reason special emphasis was placed on noise immunity and
data security in the design of the device. The EMC design implemented and
described below considers all the above named sources of interference and
the possible coupling paths.
DOK-SUPPL*-VEH*30.2***-PR03-EN-P
Rexroth IndraControl VEH 30.2 Hand-Held Terminal
I
B
I
S
I
S
I
I
B
I
S
Σ
I =0
B
I
B
I
S
I
S
I
B
1
1
2
1
2
2
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