Vega VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) standpipe ver. Fou Bedienungsanleitung PDF herunterladen (Seite 15)

5 Connecting to the bus system

VEGAPULS 62 standpipe version • Foundation Fieldbus

36510-EN-121011

5 Connecting to the bus system

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 instrument requires a operating voltage of 9 … 32 V DC. Operat-

ing voltage and the digital bus signal are carried on the same two-wire

connection cable. Power is supplied via the H1 power supply.

Connection is carried out with screened cable according to Fieldbus

specication.

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.

Make sure that the entire installation is carried out according to the

Fieldbus specication. In particular, make sure that the bus is termi-

nated with suitable terminating resistors.

With plastic housing, the NPT cable gland or the Conduit steel tube

must be screwed without grease into the threaded insert.

Max. torque for all housings see chapter "Technical data"

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.

With 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

directly to the internal ground terminal. The ground terminal outside

on the housing must be connected to the potential equalisation (low

impedance).

In systems without potential equalisation with cable screening on

both sides, connect the cable screen directly to ground potential at

the power supply unit and at the sensor. In the connection box or

T-distributor, the screen of the short stub to the sensor must not be

connected to ground potential or to another cable screen. The cable

screens to the power supply unit and to the next distributor must be

connected to each other and also connected to ground potential via a

ceramic capacitor (e.g. 1 nF, 1500 V). Low-frequency potential equali-

sation currents are thus suppressed, but the protective eect against

high frequency interference signals remains.

Safety instructions

Voltage supply

Connection cable

Cable gland ½ NPT

Cable screening and

grounding

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