Vega VEGAMET 861 - Page 41

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11 Applications and functions
VEGAMET 861 • 4 … 20 mA/HART
58866-EN-200401
Select the application "Pumping station"fromtheoptionsoered.
2. Assign measuring loop name
Assign a unique designation to the measuring point so that there
can be no confusion with other measuring points.
3. Select sensor input (only for devices with HART)
Denehowthemeasuredvalueistobetransmitted(4…20mA
or HART). When selecting HART, the desired sensor must be
selected.
4. Denesensorcharacteristicvalues
At 4 … 20 mA, select the connected sensor type, the measuring
unit and the measuring range of the connected sensor. For HART
selection,thedesiredsensorvalueandtheunitmustbedened.
5. Deneadjustmentvalues
Enter the adjustment values of the measuring point for 0 % and
for 100 %.
6. Denemodeofoperationofthepumpcontrol
Denethedesiredoperatingmodeofthepumpcontrol:pump
control1/2(samerunningtime)orpumpcontrol3/4(xed
sequence). In addition, you can select the mode sequenced or
alternating pump operation. The setup wizard and the following
application examples provide you with details on how it works.
7. Congurepumps
In this step a forced pump changeover can be activated. For de-
vices with a digital input, additional monitoring of the pumps can
becongured.Thesetupassistantandthefollowingapplication
examples provide you with details on how it works.
8. Congurerelayswitchingpoints
In the last step, enter the relay switching points at which the
pumps are to be switched.
Application example pump control 1/2
Pump control 1/2 is used to control several pumps with the same
function, in dependence on their respective elapsed running times.
The pump with the shortest elapsed running time is switched on
andthepumpwiththelongestrunningtimeswitchedo.Incaseof
increased pumping requirement, all pumps can also run at the same
time, in dependence on the entered switching points. This measure
achieves an even utilization of the pumps and increases operational
reliability.
Allrelayswithactivatedpumpcontrolareswitchedonorodepend-
ing on the accumulated operating time. The controller selects the
relay with the shortest elapsed operating time when the switch-on
point is reached and the relay with the longest elapsed operating time
whentheswitch-opointisreached.
Pump fault messages can also be processed via the digital inputs.
Thispumpcontrolsystemoerstwodierentoptions:
Functional principle