VEGA VEGABAR S 16 - Manual (Page 17)

3 .3
Mounting steps
Welding the socket
For mounting VEGABAR S 16, a welded socket is
required. You can find these components in the
VEGA line of accessories in the supplementary
instructions manual "Welded socket and seals".
4 C
onnecting to power supply
4 .1
Preparing the connection
Note safety instructions
Always keep in mind the following safety instruc-
tions:
l
Connect only in the complete absence of line
voltage
l
If overvoltages are expected, install overvolt-
age arresters
Select power supply
The supply voltage and the current signal are
carried on the same two-wire connection cable.
Provide a reliable separation between the supply
circuit and the mains circuits according to
DIN VDE 0106 part 101.
VEGA power supply units VEGATRENN 149AEx,
VEGASTAB 690, VEGADIS 371 as well as all
VEGAMETs meet this requirement. When using
one of these instruments, protection class III is
ensured for VEGABAR S 16.
Keep the following additional influences for the
operating voltage in mind:
l
Output voltage of the power supply unit can be
lower under nominal load (with a sensor
current of 20.5 mA or 22 mA in case of fault
message)
l
Influence of additional instruments in the circuit
(
see load values in chapter "Technical data")
Select connection cable
VEGABAR S 16 is connected with standard two-
wire cable. The outer cable diameter of 5 … 9 mm
ensures the seal effect of the cable gland. If strong
electromagnetic interference is expected,
screened cable should be used.
Cable screening and grounding
Connect the cable screen on both ends to ground
potential.
If potential equalisation currents are expected, the
connection on the processing side must be made
via a ceramic capacitor (e. g. 1 nF, 1500 V). The
low frequency potential equalisation currents are
thus suppressed, but the protective effect against
high frequency interference signals remains.
Select connection cable for Ex applications
Take note of the corresponding installation
regulations for Ex applications.
4 .2
Connection procedure
Connection via angle plug connector
Proceed as follows:
1 Loosen the screw on the rear of the plug
connector
2 Remove the plug connector and seal from
VEGABAR S 16
3 Remove the plug insert out of the plug housing
1
2
3
Fig. 9: Loosen the plug insert
1 Cable gland
2 Plug insert
3 Plug housing
4 Remove approx. 5 cm of the cable mantle, strip
approx. 1 cm insulation from the individual
wires
5 Lead the cable through the cable gland into the
plug housing
6 Connect the wire ends to the screw terminals
according to the wiring plan
VEGABAR S 16 17
Connecting to power supply
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