Vega PLICSMOBILE T61 User Manual download pdf (Page 21)

6 Battery operation and power saving mode

PLICSMOBILE T61 • External GSM/GPRS radio unit

37700-EN-130228

The solar module comes ready to use with a 5 m connection cable.

The free cable end is led through the screw connection into the

electronicschamberofthePLICSMOBILE.Yo u canndthedetailson

connectioninchapter"Connecting to power supply".Theblackcore

is connected to terminal 1(+), the brown core to terminal 2(-).

Note:

Make sure that the two cores of the connection cable are energized

when the solar module is not covered. Avoid a shortcircuit during

mounting and conenction. This should also be avoided when shorten-

ing the cable, if necessary.

6.5 Battery sizing

When selecting an external battery/accumulator, the following points

must be observed:

Power consumption in power saving mode:

If a battery or an accumulator is used which cannot be automatically

charged cyclically, then the power saving mode should be activated.

With an operating voltage of e.g. 12 V, a standby power consump-

tion of 0.3 mW must be taken into account. With an assumed lifetime

of e.g. one year, the requirement is approximately 2.6 Wh, which

corresponds to a battery capacity of 0.22 Ah at 12 V. The standby

powerconsumptionwithspecicoperatingvoltagesisstatedinthe

"Technical data".

Power requirement complete measurement cycle incl. meas-

ured value transmission:

A measurement cycle lasts approximately 60 to 120 seconds (de-

pendent on sensor type and network quality) and includes automatic

switching on of the sensor (HART multidrop mode with 4 mA),

recording of the measured value, measured value transmission and

a return to the power saving mode. During this time, approximately

20 mWh of energy is required. For example, with one measurement

per day, this adds up to approx. 9.6 Wh per year, which corresponds

to a battery capacity of approx. 0.8 Ah at 12 V.

Examples for battery capacity depending on the number of

transmission cycles

Number of mes-

sages/day

Annual consumption PLICSMOBILE

Standby energy

demand

Energy demand

for message

transmission

Required battery

capacitance with

12 V

1 2.6 Wh 9.6 Wh 0.8 Ah

2 2.6 Wh 16.8 Wh 1.4 Ah

4 2.6 Wh 32.4 Wh 2.7 Ah

8 2.6 Wh 61 Wh 5.1 Ah

24 2.6 Wh 178.8 Wh 14.9 Ah

Connection

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 39 40

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Vega PLICSMOBILE T61 User Manual Page 21

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