Vega D90 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 13)

Pressure transmitter D90 (Profibus PA) 13

Electrical connection

3 Electrical connection

3.1 Connection instructions

The electronics in pressure transmitter D90

requires a supply voltage of 9 … 32 V DC.

The supply voltage and the digital output

signal are led via the same two-wire cable to

the terminals. The external energy is pro-

vided via a segment coupler.

Note the following instructions for electrical

connection:

- Connection must be made according to the

specific installation standards (e.g. in Ger-

many acc. to the VDE regulations).

- Electrical connection must have a protec-

tive measure against polarity reversal.

- The connection of field instruments is gen-

erally made via T-adapters on stubs..

- Screened cable is recommended for con-

nection (cable types see chapter "1.3

Technical data"). The shielding must be

grounded on both ends (on the T-adapter

and on the connection housing of D90).

- For use in Ex areas, the installation regula-

tions must be observed.

Safety information for Ex applications

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 sensors. Protect

yourself and the instruments.

Qualified personnel

Instruments used in Ex areas must be con-

nected only by trained and qualified person-

nel. The qualified personnel must observe

and understand the mounting regulations

and the supplied type approval certificates

and conformity certificates.

If an instrument is used in hazardous areas,

the respective regulations, conformity certifi-

cates and type approvals of the sensors,

separators or safety barriers must be noted

(e.g. DIN VDE 0165).

Sensors used in Ex areas must be operated

only on intrinsically safe circuits. The permis-

sible electrical values are stated in the con-

formity certificate or the type approval certifi-

cate.

Intrinsically safe circuits with more than one

active instrument (instrument delivering elec-

trical energy) are not allowed. Please note the

special installation regulations (DIN VDE

0165).

Certain pressure transmitters are provided

with a warning label informing of measures to

be taken to avoid the danger of electrostatic

discharge. Note the content of the warning

label.

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