Proportional Pressure; Pump Changeover; Undo; Pump Name - Grundfos Hydro Multi-E Series Installation And Operating Instructions Manual

12.9 Proportional pressure

It is possible to control the system in proportional pressure
control see section 12.3 Control
system automatically adjusts the setpoint to the actual flow rate to
compensate for flow dependent dynamic losses. This will also
gain considerable energy savings and increase the comfort for
the users.
To use this function, the system needs to calculate the flow in the
system and the head of the system must therefore be known
(outlet - inlet pressure)
The outlet pressure is always known as the system is always
fitted with an outlet pressure sensor. The inlet sensor depends on
the system design. If not present, it can be retrofitted see section
15.1.3 Inlet pressure sensor.
If there is no inlet pressure available or if it is very constant, it is
also possible to set a fixed inlet pressure.
Set the flow calculation
Connect to each pump in the system with Grundfos GO (one at
the time) and go to settings > Setting the proportional pressure:
Type in the Pump data if not already done from factory (it can be
read from the pump nameplate).
• Rated flow (Q)
• Rated Head (H)
• Max Head (Hmax).
The individual pump will now calculate its own flow, and the
system will sum up the system flow.
Set the proportional pressure control
Connect to one of the master pumps with Grundfos GO to set the
proportional pressure control:
• Set the System setpoint (this will be the maximum pressure
setpoint)
Go to "Settings" > "Setting the proportional pressure":
• Choose the control curve function ("Linear" or "Quadratic")
see fig. 43
• Set the zero flow head (The minimum setpoint in the system)
• Set the Qmax (the flow point where the system reaches the
maximum setpoint)
• Activate or deactivate the Fixed inlet pressure (depending of
inlet pressure measurement)
• Type in the fixed inlet pressure (if activated).
H
C B
A
Fig. 43 Proportional pressure
A: The zero head
B: Qmax in cascade
C: The maximum pressure (standard setpoint).
24
mode. With this function, the
Q
Pump in constant-curve control mode
In constant-curve control mode, the pump performance will
operate between the maximum and minimum curve of the pump.
See fig. 44.
Max.
Min.
Fig. 44 Pump in constant-curve control mode

12.10 "Pump changeover"

The function ensures that the pumps run for the same number of
operating hours. In certain applications, the requirement remains
constant for long periods and does not require all pumps to run.
In such situations, pump changeover does not take place
naturally, and forced pump changeover may thus be required.
Once every 24 hours, the system will force a changeover to the
pump with the lowest operating hours. The interval can be set
from 1 to 25 hours and the timer starts when the system is
powered on.

12.11 "Undo"

This menu is only available in Grundfos GO.
This display allows you to undo all settings that have been made
with Grundfos GO in the current session. Once you have undone
settings, you cannot revert back to them.

12.12 "Pump name"

This display allows you to name the system which makes it easy
to identify the system when connecting to Grundfos GO.

12.13 "Unit configuration"

This menu allows you to choose between SI and US units. You
can set either unit system as the default for the entire system or
customise the preferred unit for each parameter.
Factory setting
See section 29. Factory settings.