VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) Profibus PA Approval according to LPR radio standard - Manual (Page 25)

5 Connecting to the bus system
5 .1 Preparing the connection
Always keep in mind the following safety instructions:
l Connect only in the complete absence of line voltage
l If voltage surges are expected, install overvoltage arresters
The voltage supply is provided by a Profibus DP /PA segment coupler.
The voltage supply range can differ depending on the instrument
version. You can find the data for voltage supply in chapter "Technical
data".
Connection is made with screened cable according to the Profibus
specification. Power supply and digital bus signal are carried over the
same two-wire connection cable.
Use cable with round cross-section. A cable outer diameter of 5 … 9 mm
(0.2 … 0.35 in) ensures the seal effect of the cable gland. If you are
using cable with a different diameter or cross-section, exchange the
seal or use a suitable cable gland.
Please make sure that your installation is carried out according to the
Profibus specification. In particular, make sure that the termination of
the bus is done with appropriate terminating resistors.
You can find detailed information of the cable specification, installation
and topology in the "Profibus PA - User and Installation Guideline" on
www.profibus.com.
With plastic housing, the NPT cable gland or the Conduit steel tube
must be screwed without grease into the threaded insert.
Max. torque for all housings see chapter "Technical data"
Make sure that the cable screening and ground is executed according
to the Fielbus specification. If electromagnetic interference is expected
which is above the test values of EN 61326-1 for industrial areas, we
recommend to connect the cable screen on both ends to ground
potential.
In this case with systems with potential equalisation, connect the cable
screen directly to ground potential at the power supply unit, in the
connection box and at the sensor. The screen in the sensor must be
connected directly to the internal ground terminal. The ground terminal
outside on the housing must be connected to the potential equalisation
(low impedance).
In systems without potential equalisation with cable screening on both
sides, connect the cable screen directly to ground potential at the
power supply unit and at the sensor. In the connection box or T-
distributor, the screen of the short stub to the sensor must not be
Safety instructions
Voltage supply
Connection cable
Cable gland ½ NPT
Cable screening and
grounding
VEGAPULS 62 • Approval according to LPR radio standard 25
5 Connecting to the bus system
41720
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EN
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