Grundfos TPE Series - Page 50

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50
13.43.1 Alternating operation
Alternating operation functions as a duty/standby
operating mode and is possible with two pumps of
same size and type connected in parallel. The main
purpose of the function is to ensure an even amount
of running hours and to ensure that the standby
pump takes over if the running pump stops due to an
alarm.
Each pump requires a non-return valve in series with
the pump.
You can choose between two alternating operation
modes:
• "Alternating operation, time"
Pump changeover to the other is based on time.
• "Alternating operation, energy"
Pump changeover to the other is based on
energy consumption.
If the duty pump fails, the other pump takes over
automatically.
13.43.2 Backup operation
Backup operation is possible with two pumps of
same size and type connected in parallel. Each
pump requires a non-return valve in series with the
pump.
One pump is operating continuously. The backup
pump is operated for a short time each day to
prevent seizing up. If the duty pump stops due to a
fault, the backup pump starts automatically.
13.43.3 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 run at equal speed. Pump
changeover is automatic and depends on energy,
operating hours and fault.
If the pump system consists of 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.
Set the control mode to "Constant pressure" or
"Constant curve".
This function is available with up to 4 motors
installed in parallel. The motors must be of the same
size and the pumps must be of the same model.
• The performance is adjusted to the demand
through cutting pumps in or out and through
parallel control of the pumps in operation.
• The controller maintains a constant pressure
through continuous adjustment of the speed of
the pumps.
• Pump changeover is automatic and depends on
load, operating hours and fault detection.
• All pumps in operation run at the same speed.
• The number of pumps in operation also depends
on the energy consumption of the pumps. If only
one pump is required, two pumps will run at a
lower speed if this results in a lower energy
consumption.
• If several motors in the system have a sensor,
they can all function as master and take over the
master function if the other motors fail.
13.43.4 Setting a multipump system
You can set a multipump system in the following
ways:
• Grundfos GO and wireless pump connection
• Grundfos GO and wired pump connection
• Advanced control panel and wireless pump
connection
• Advanced control panel and wired pump
connection
See step-by-step descriptions below.