Vega SOLITRAC 31 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 16)

5 Connecting to power supply

SOLITRAC 31 • Probus PA

43834-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

The voltage supply is provided by a Probus DP /PA segment coupler.

The voltage supply range can dier depending on the instrument

version. You can nd the data for voltage supply in chapter "Technical

data".

Connection is made with screened cable according to the Probus

specication. Power supply and digital bus signal are carried over the

same two-wire connection cable.

Use cable with round cross-section. A cable outer diameter of

5 … 9 mm (0.2 … 0.35 in) ensures the seal eect of the cable gland.

If you are using cable with a dierent diameter or cross-section,

exchange the seal or use a suitable cable gland.

Please make sure that your installation is carried out according to the

Probus specication. In particular, make sure that the termination of

the bus is done with appropriate terminating resistors.

You can nd detailed information of the cable specication, installa-

tion and topology in the "Probus PA - User and Installation Guide-

line" on www.probus.com.

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.

Make sure that the cable screening and ground is executed accord-

ing to the Fielbus specication. If electromagnetic interference is

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

areas, we recommend to connect the cable screen on both ends to

ground potential.

In systems with potential equalisation, connect the cable screen

directly to ground potential at the power supply unit, in the connection

box and at the sensor. The screen in the sensor must be connected

Safety instructions

Voltage supply

Connection cable

Cable entry

Cable gland ½ NPT

Cable screening and

grounding

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