Wika DPT-10 User Manual download pdf (Page 30)

5 Connecting to power supply

5.1 Preparing the connection

Always keep in mind the following safety instructions:

l Connect only in the complete absence of line voltage

l If overvoltage surges are expected, overvoltage arresters should

be installed according to Proﬁbus speciﬁcations

In hazardous areas you should take note of the appropriate

regulations, conformity and type approval certiﬁcates of the sensors

and power supply units.

Power is supplied via a Proﬁbus DP/PA segment coupler. The power

supply range can diﬀer depending on the instrument version. The

exact range is stated in the "Technical data".

DPT10 is connected with screened cable according to the Proﬁbus

speciﬁcation. 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 eﬀect of the cable gland. If you are

using cable with a diﬀerent 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

Proﬁbus speciﬁcation. In particular, make sure that the termination of

the bus is done with appropriate terminating resistors.

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 sens or. 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, 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). The low

frequency potential equalisation currents are thus suppressed, but the

protective eﬀect against high frequency interference signals remains.

The total capacitance of the cable and of all capacitors must not exceed

10 nF in Ex applications.

Note safety instructions

Take note of

safety instruc-

tions for Ex ap-

plications

Select power supply

Selecting connection

cable

Cable screening and

grounding

30 Diﬀerential pressure transmitter DPT10 - metal measuring diaphragm • Proﬁbus PA

5 Connecting to power supply

37245-EN-100120

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 95 96

Comments to this Manuals

No comments

Wika DPT-10 User Manual Page 30

Comments to this Manuals

Related products and manuals for Measuring instruments Wika DPT-10