VEGA VEGAPULS 45 VBUS - Manual (Page 30)

30 VEGAPULS 42, 44 and 45 – VBUS
Electrical connection
4 Electrical connection
4.1 Connection and connection
cable
Safety information
As a rule, do all connecting work in the com-
plete absence of line voltage. Always switch
off the power supply before you carry out
connecting work on the radar sensors. Pro-
tect yourself and the instruments.
Qualified personnel
Instruments which are not operated with
protective low voltage or DC voltage must
only be connected by qualified personnel.
Connection and grounding
A standard two or four-wire cable (sensors
with separate supply) with max. 2.5 mm
2 can
be used for connection. The earth conductor
terminal is galvanically connected with the
process fitting (thread or flange).
Ex protection
If an instrument is used in hazardous areas,
the respective regulations, conformity certifi-
cates and type approvals for systems in Ex
areas must be noted (e.g. DIN 0165).
Intrinsically safe circuits with more than one
active instrument (instrument delivering elec-
trical energy) are not allowed. Please note the
special installation regulations (DIN 0165).
Note!
In Ex applications, grounding on both ends is
not allowed due to potential transfer. If an
instrument is used in hazardous areas, the
respective regulations, conformity certificates
and type approvals for systems in Ex areas
must be noted (e.g. DIN 0165).
Note the approval documents and the in-
cluded safety data sheet attached to the Ex
sensors.
Connection cable
Please note that the connection cables are
specified for the expected operating conditions
in your systems. The cable must have an outer
diameter of 5 … 9 mm (1/2 to 1/3 inch). Other-
wise the seal effect of the cable entry will not be
ensured.
Cables for intrinsically safe circuits must be
marked blue and must not be used for other
circuits.