Vega VEGABAR 21 Bedienungsanleitung PDF herunterladen (Seite 13)

VEGABAR 21 13

Mounting, electrical connection

2 Mounting

VEGABAR can be mounted in any position.

The cable entries have to point downwards to

avoid humidity ingress. For this purpose the

housing can be rotated by 330° against the

mounting part.

For mounting, a seal must be used corre-

sponding to the connection. This seal is either

supplied with VEGABAR or must be provided

by the customer.

Compensation of the atmospheric

pressure

The atmospheric pressure of instruments

used for overpressure measurements is

compensated via a breather facility inte-

grated in the housing.

3 Electrical connection

3.1 Connection information

The electronics in VEGABAR 21 requires a

power supply of 12 … 36 V DC. It is pro-

vided in two-wire technology, i.e. supply

voltage and current signal are led to the

terminals via the same two-wire connection

cable.

This external energy is provided via a sepa-

rate power supply unit:

- power supply unit, e.g. VEGASTAB 690

- processing unit with integral DC-current

source (e.g. active DCS-input)

- VEGAMET or VEGADIS 371

Observe that the external energy source is

reliably separated from the mains circuits

acc. to DIN VDE 0106, part 101. The above

mentioned VEGA-instruments meet this re-

quirement and protection class III is therefore

ensured.

The external energy source must supply a

terminal voltage of at least 12 V to the trans-

mitter. The actual terminal voltage on the

transmitter depends on the following factors:

- output voltage of the external energy

source under nominal load.

- Electrical resistors of the connected instru-

ments in the circuit (see connected instru-

ments, load resistor).

Note the following instructions for electrical

connection:

- The connection must be made acc. to the

specific installation standards (e.g. in Ger-

many according to the VDE-regulations).

- The terminal voltage must not exceed 36 V

to avoid damage of the electronics.

- The electrical connection is provided with a

reverse polarity protection.

- The wiring between VEGABAR and power

supply can be made with standard two-

wire cable.

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