Vega SOLITRAC 31 4 … 20 mA_HART - four-wire With SIL qu Bedienungsanleitung PDF herunterladen (Seite 16)

5 Connecting to power supply

SOLITRAC 31 • 4 … 20 mA/HART - four-wire

43387-EN-131119

5 Connecting to power supply

5.1 Preparing the connection

Always keep in mind the following safety instructions:

•

Connect only in the complete absence of line voltage

•

If overvoltage surges are expected, overvoltage arresters should

be installed

In this case, the instrument is designed in protection class II. To main-

tain this protection class, it is absolutely necessary that the ground

conductor be connected to the internal ground terminal. Take note of

the general installation regulations.

Supply voltage and current signal are carried on separate connection

cables if reliable separation is required. The supply voltage range can

dierdependingontheinstrumentversion.

Thedataforpowersupplyarespeciedinchapter"Technical data".

For power supply, an approved installation cable with PE conductor is

required.

The 4 … 20 mA current output is connected with standard two-wire

cable without screen. If electromagnetic interference is expected

which is above the test values of EN 61326-1 for industrial areas,

screened cable should be used.

Use cable with a round wire cross section. An outer cable diameter

of6…12mm(0.24…0.47in)ensuresthesealeectofthecable

entry.Ifcablewithadierentdiameterorwirecrosssectionisused,

exchange the seal or use an appropriate cable connection. Unused

cableentryglandsdonotprovidesucientprotectionagainstmois-

ture and must be replaced with blind plugs.

Generally provide all unused cable entries with suitable blind plugs.

The thin foam rubber washers in the cable glands only serve as a

dust cover during transport.

In the case of instrument housings with self-sealing NPT threads, it

is generally not possible to have the cable glands screwed in at the

factory. The openings for the cable glands are therefore covered with

red protective caps as transport protection.

Before setup you have to replace these protective caps with approved

cable glands or close the openings with suitable blind plugs. Unused

cableglandsdonotprovidesucientprotectionagainstmoistureand

must be replaced with blind plugs.

The suitable cable glands and blind plugs come with the instrument.

If screened cable is necessary, connect the cable screen on both

ends to ground potential. In the sensor, the screen must be connected

directly to the internal ground terminal. The ground terminal on the

outside of the housing must be connected to the potential equalisa-

tion (low impedance).

Safety instructions

Voltage supply via mains

voltage

Select connection cable

Cable entry

Cable gland ½ NPT

Cable screening and

grounding

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