VEGA VEGALOG 571 - Manual (Page 28)

28 VEGALOG 571
Electrical connection
3 Electrical connection
3.1 General connection instructions
For electrical connection you should generally
observe the following instructions:
- the connection must be made according to
the appropriate national installation stand-
ards (e.g. in Germany acc. to the VDE-
regulations).
- the wiring between the input cards and the
sensors can be made with standard two-
wire cable.
- if strong electromagnetic interferences are
expected, screened cable is recom-
mended. The screening must be earthed at
one sensor end.
- the line resistances stated in the technical
data must not be exceeded.
- when several ultrasonic or radar sensors
are powered via the EV-card, the neces-
sary wire cross-sections must be main-
tained.
- if overvoltages are expected, we recom-
mend a sensors electronic with integral
overvoltage protection or the installation of
VEGA-overvoltage arresters.
- the power supply of the VEGALOG-cards
must be made with low voltage to keep
protection class II. When using VEGASTAB
593, a reliable separation of the mains
circuits acc. to DIN/VDE 0106, part 101 is
achieved.
- if the power supply is not taken over by
VEGASTAB 593, the supply line must be
looped via the supplied NF-filter (type:
Schaffner FN660-10/06) (see figure).
- the supply line after the filter (24␣ V␣ DC)
should be a loop with the biggest possible
distance from the signal lines in order to
avoid coupling.
- secure the connected cables or lines by a
strain relief which is available from VEGA.
This is also used as earth terminal for
screened lines.
NF-filter
Signal lines
Supply lines