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11.5.1 "Proportional pressure"
Pump variant
NBE, NBSE, NKE, TPE, TPED
NBE, NBSE, NKE, TPE, TPED
Series 2000
The head of the pump is reduced at decreasing water demand
and increased at rising water demand. See fig. 25.
This control mode is especially suitable in systems with relatively
large pressure losses in the distribution pipes. The head of the
pump increases proportionally to the flow in the system to
compensate for the large pressure losses in the distribution
pipes.
The setpoint can be set with an accuracy of 0.1 metre. The head
against a closed valve is half the setpoint.
For more information about settings, see section
11.6 "Proportional-pressure
setup".
H
H
set
H
set
2
Fig. 25 "Proportional pressure"
Example
• Factory-fitted differential-pressure sensor.
p
Fig. 26 "Proportional pressure"
Controller settings
For recommended controller settings, see section
11.14 "Controller" ("Controller settings")
"Proportional pressure"
-
●
Q
11.5.2 "Constant pressure"
Pump variant
NBE, NBSE, NKE, TPE, TPED
NBE, NBSE, NKE, TPE, TPED
Series 2000
We recommend this control mode if the pump is to deliver a
constant pressure, independently of the flow in the system. The
pump maintains a constant pressure independently of the flow
rate. See fig. 27.
H
Fig. 27 "Constant pressure"
This control mode requires an external pressure sensor as shown
in the examples below. You can set the pressure sensor in the
Assist menu. See section
11.41
Examples
• One external pressure sensor.
p
Fig. 28 "Constant pressure"
Controller settings
For recommended controller settings, see section
11.14 "Controller" ("Controller
settings").
"Constant pressure"
●
●
Q
Assisted pump setup
.
p
25
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