Vega VEGABAR 25 Bedienungsanleitung PDF herunterladen (Seite 11)

VEGABAR 25 11

Mounting, electrical connection

2 Mounting

VEGABAR can be mounted in any position.

Cable entries must point downwards to avoid

humidity ingress. For this purpose the hous-

ing can be rotated by 330° in relation to the

mounting part.

A seal, appropriate for the connection, must

be used for mounting. 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 25 require 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 PLC-input)

- VEGAMET or VEGADIS 371

Note that the external energy source is reli-

ably separated from the mains circuits acc.

to DIN VDE 0106, part 101. The above-men-

tioned VEGA-instruments meet this require-

ment, 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:

- Connection must be made acc. to the spe-

cific installation standards (e.g. in Germany

according to the VDE-regulations).

- Terminal voltage must not exceed 36 V to

avoid damage to the electronics.

- Electrical connection is provided with re-

verse polarity protection.

- The wiring between VEGABAR and the

power supply can be carried out using

standard two-wire cable.

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