Vega VEGAPULS C 21 User Manual

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5 Connecting to power supply
VEGAPULS C 21 • Modbus and Levelmaster protocol
58343-EN-200806
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•
Carryoutelectricalconnectionbytrained,qualiedpersonnel
authorised by the plant operator
Warning:
Only connect or disconnect in de-energized state.
The operating voltage and the digital bus signal are routed via sepa-
rate two-wire connection cables.
Thedataforpowersupplyarespeciedinchapter"Technical data".
Note:
Power the instrument via an energy-limited circuit (power max. 100 W)
acc. to IEC 61010-1, e.g.
•
Class 2 power supply unit (acc. to UL1310)
•
SELV power supply unit (safety extra-low voltage) with suitable
internal or external limitation of the output current
Thedeviceissuppliedwithaxedcable.Ifanextensionisrequired,
twisted two-wire cable suitable for RS 485 should be used for the
Modbus signal.
If electromagnetic interference is expected which is above the test
values of EN 61326-1 for industrial areas, shielded cable should be
used.
Make sure that the entire installation is carried out according to the
Fieldbusspecication.Inparticular,makesurethatthebusistermi-
nated with suitable terminating resistors.
We recommend to connect the cable screening to ground potential at
one end on the supply side when using shielded cable.
5.2 Wiring plan
5
1
2
3
4
Fig. 18: Wire assignment in permanently connected connection cable
Wire colour Function Polarity
1 Brown Voltage supply Plus (+)
2 Blue Voltage supply Minus (-)
Safety instructions
Voltage supply
Connection cable
Cable screening and
grounding
Wire assignment, con-
nection cable

Vega VEGAPULS C 21 Specifications

General

Brand	Vega
Model	VEGAPULS C 21
Category	Accessories
Language	English