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11. Assist
11.1 Setup of multi-pump system
The multi-pump function enables the control of single-head
pumps connected in parallel or twin-head pumps without the use
of external controllers. The pumps in a multi-pump system
communicate with each other via the wireless GENIair connection
or the wired GENI connection.
A multi-pump system is set up via a selected pump, i.e. the
master pump (first selected pump). All Grundfos pumps with a
wireless GENIair connection can be connected to the multi-pump
system.
The multi-pump functions are described in the following sections.
11.1.1 Alternating operation
Only one pump is operating at a time.
The change from one pump to the other depends on time or
energy. If a pump fails, the other pump will take over
automatically.
Pump system:
• Two single-head pumps connected in parallel.
The pumps must be of the same type and size. Each pump
requires a non-return valve in series with the pump.
11.1.2 Back-up operation
One pump is operating continuously. The back-up pump is
operated at intervals to prevent seizing up. If the duty pump stops
due to a fault, the back-up pump will start automatically.
Pump system:
• Twin-head pump.
• Two single-head pumps connected in parallel.
The pumps must be of the same type and size. Each pump
requires a non-return valve in series with the pump.
11.1.3 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.
All pumps in operation will run at equal speed. Pump changeover
is automatic and depends on energy, operating hours and fault.
Pump system:
• Two to four single-head pumps connected in parallel.
The pumps must be of the same type and size. Each pump
requires a non-return valve in series with the pump.
The control mode must be set to "Const. pressure", "Con. diff.
press." or "Const. curve".
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