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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 offered.
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)
Define how the measured value is to be transmitted (4 … 20 mA
or HART). When selecting HART, the desired sensor must be
selected.
4. Define 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 defined.
5. Define adjustment values
Enter the adjustment values of the measuring point for 0 % and
for 100 %.
6. Define mode of operation of the pump control
Define the desired operating mode of the pump control: pump
control 1/2 (same running time) or pump control 3/4 (fixed
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. Configure 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 configured. The setup assistant and the following application
examples provide you with details on how it works.
8. Configure 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 off. 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 off 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-off point is reached.
Pump fault messages can also be processed via the digital inputs.
This pump control system offers two different options:
Functional principle
