Grundfos MAGNA3 D 32-80 180 97924451 [43/1656] Setup analog input
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Grundfos MAGNA3 D 32-80 180 97924451 [43/1656] Setup analog input

Grundfos MAGNA3 D 32-80 180 97924451 [43/1656] Setup analog input
English (GB)
43
"Cascade operation"
Fig. 55 "Cascade operation"
Cascade operation ensures that the pump performance is
automatically adapted to the consumption by switching pumps on
or off. The system thus runs as energy-efficiently as possible with
a constant pressure and a limited number of pumps.
When a twin-head pump is running in constant-pressure control
mode, the second pump starts at 90 % of the maximum
performance. The second pump stops automatically when it is no
longer needed to fulfil the system demand. If both pumps are
running, they run at the same speed.
Pump system:
• Set the control mode to "Const. press." or "Constant curve".
"No multi-pump function"
Fig. 56 "No multi-pump function"
The pumps run as single-head pumps.
8.8.4 External connections in a multipump systems
The following external connections need only to be fitted to the
master pump:
• analog input
• digital input
• communication interface module, CIM.
If you want to monitor a slave pump, mount a communication
interface module on the slave pump too.
Set the following on both the master and slave pump:
• Relays
From model B. Configure on both master and slave pump.
• Operating mode, control mode and setpoint
These modes are system parameters and they are shared
between the two pumps.
• Heat energy monitor
The heat energy monitor works on the system level.
Therefore, both pumps display the heat energy for the system,
not for the individual pump.
8.8.5 "Setup, analog input"
This menu guides you through the setup of the analog inputs, for
example a temperature sensor input to a heat energy monitor.
Navigation
"Home" > "Assist" > "Setup, analog input"
1. To enable the sensor input, select "Heat energy monitor" with
or and press [OK].
2. Follow the step-by-step guide to complete the sensor-input
setup. Start with the unit display and end with the summary
display.
3. Check the entered values.
4. Press [OK] to confirm and enable the settings.
8.8.6 "Heat energy monitor"
The heat energy monitor is a monitoring function that calculates
the heat energy consumption within a system. The built-in flow
estimation needed for the calculation has an inaccuracy of ± 10 %
of the maximum flow. Also, the temperature measurements
needed for the calculation have some inaccuracy depending on
the sensor type. Therefore, you cannot use the heat energy value
for billing purposes. However, the value is perfect for optimisation
purposes in order to prevent excessive energy costs caused by
system imbalances.
The heat energy monitor requires an additional temperature
sensor installed in the flow pipe or return pipe depending on
where the pump is installed.
Fig. 57 MAGNA3 with built-in heat energy monitor
TM06 7498 3516TM06 7503 3516
Heat energy monitor
undef-147TM05 5367 3612
t
kWh
F
t
R

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