Operation - Grundfos MAGNA3 Instructions Manual

Multi-pump function

Operation

When operating in multi-pump mode, the operating mode,
control mode and setpoint is active on a system level,
meaning common for both pumps.
When changing settings or reading out multi-pump
parameters, it is only necessary to do this on
one of the pumps.
Grundfos eye and the relays are local and
show the status of the specific pump
(e.g. running, stopped, warning).
Selection of master pump
The pump from which the multi-pump system is formed,
will automatically be the master.
On twin-pumps, where multi-pump is factory enabled, see chapter
"how to identify the master pump "under" multi-pump setup".
For changing the master pump, the multi-pump system can be
dissolved and reinitialized from the chosen pump.
Heat energy monitor
The heat energy parameters (flow, volume, heat energy)
are accumulated on system level. Both pumps will
display the same values.
If using the heat energy monitor, the temperature
sensor should only be installed on the master pump.
Autonomous twin pump control
In applications where the twin pump is autonomously
controlled by a 3rd party controller, it is recommended
to dissolve the factory enabled multi-pump system.
When disabling the internal multi-pump control, it is
necessary to connect input/outputs to both pump
heads.
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