Vega PLICSMOBILE T61 User Manual download pdf (Page 13)

5 Connecting to power supply

PLICSMOBILE T61 • External GSM/GPRS radio unit

37700-EN-130228

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 operating voltage of PLICSMOBILE T61 is connected with stand-

ard cable according to the national installation standards.

The sensor connection cable included in the delivery is used to con-

nect the sensor.

Connect the cable screen on the sensor side 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 sensor

housing must be connected to the potential equalisation (low imped-

ance).

Note:

Remember that only 4 … 20 mA HART two-wire sensors from the

plics

series with single chamber housing can be connected. The

connection is carried out via the I²C interface. Hence no additional ex-

ternal indication, such as e.g. VEGADIS 61, can be connected when

using PLICSMOBILE.

5.2 Connection options

Power can be supplied to the sensor and PLICSMOBILE in two ways:

With this version, only one voltage supply is required for both devices.

The voltage supply is connected to the PLICSMOBILE T61. In addi-

tion to the measured value, the sensor connection cable also carries

the voltage supply of the sensor. Hence there is no 4 … 20 mA signal

from the sensor electronics available for processing, e.g. via a PLC.

That's why the measured value transmission can only be carried out

exclusively via radio transmission through e-mail/SMS/WEB-VV.

With this version, the sensor and the PLICSMOBILE T61 are each

powered via a separate voltage supply. The measured values can

be transmitted via radio communication and the 4 … 20 mA signal

for processing, for example via a PLC, is available in parallel. If this

version is used, the two cores (no. 1/2) of the sensor connection

cable used for voltage supply are not required and must be isolated.

Two cable entries are now required on the sensor (1 x sensor con-

nection cable and 1 x external voltage supply). For this purpose, the

blind stopper on the sensor must be replaced by the attached cable

gland. Connection of the sensor supply is carried out according to the

respective operating instructions.

Note safety instructions

Select connection cable

Cable screening and

grounding

Common voltage supply

for sensor and PLICSMO-

BILE

Separate voltage supply

for sensor and PLICSMO-

BILE

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