Vega Capacitive electrodes EK Profibus PA Bedienungsanleitung PDF herunterladen (Seite 20)

20 Capacitive electrodes EK - Profibus PA

Electrical connection

3 Electrical connection

3.1 Connection instructions

Note

Switch off the power supply before starting

connection work.

Connect the supply voltage acc. to the

following connection diagrams.

Note

If strong electromagnetic interference is

expected, we recommend using screened

cable. The screening of the cable should only

be earthed at one end (sensor end).

Always connect the instrument to vessel

ground (PA): For this purpose, there is a

terminal on the side of the housing. This

connection is also used to supply the ground

reference potential as well as to drain off

electrostatic charges.

The electronics module CAP E34 PA requires

a supply voltage of 12...36 V DC. The supply

voltage and the digital output signal are led

via the same two-wire connection cable to the

terminals. The external energy is provided by

a segment coupler.

Note the following instructions for electrical

connection:

- Connection must be made according to

the country-specific installation standards

(e.g. in Germany acc. to the VDE

regulations).

- The electrical connection must have a

protective measure against polarity

reversal.

- The connection of field instruments is

generally made via T-adapters on stubs.

- Screened cable is recommended for

connection (cable types, see chapter "1.3

Technical data"). The shielding must be

connected on both ends (on the T-adapter

and on the instrument).

- For use in Ex areas, the installation

regulations must be noted.

3.2 Wiring plan

Note

The oscillator is independent of the electrode

and can be exchanged on site.

12 5678

PROFIBUS

+-

EEx ia IIC

see certificate

on

87654321

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Segmentkoppler

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