Proportional-Pressure - Grundfos TPE2 D Manual Del Usuario

17.6.2 FLOW
ADAPT
Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
When you select FLOW , the pump runs AUTO
ADAPT
ensures that the flow never exceeds the entered FLOW
value.
The setting range for FLOW
LIMIT
flow rate of the pump.
The factory setting of the FLOW
AUTO factory setting meets the maximum curve.
ADAPT
See fig. 36.
Do not set the FLOW lower than the sized duty point.
LIMIT
H 25 %
Setting range
H
fac
H
auto_min
Fig. 36 FLOW
ADAPT
17.6.3 "Proportional pressure"
Pump variant
TPE3,TPE3 D
TPE2,TPE2 D
The pump head is reduced at decreasing water demand and
increased at rising water demand. See fig. 37.
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 0.33 ft (0.1 m).
The head against a closed valve is half the setpoint.
For more information about settings, see section

17.7 "Proportional-pressure

setup".
H
H
set
H
set
2
Fig. 37 "Proportional pressure"
"FLOW "
ADAPT
●
-
and
ADAPT
LIMIT
is 25 to 90 %, of the maximum
is the flow where the
LIMIT
90 % Q
max
Q
Q
fac
"Proportional pressure"
●
-
Q
Example
• Factory-fitted differential-pressure sensor.
p
Fig. 38 "Proportional pressure"
Controller settings
For recommended controller settings, see section
17.18 "Controller"("Controller settings").
17.6.4 "Constant pressure"
Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
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. 39.
H
Fig. 39 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 17.48 Assisted pump
Examples
• One external pressure sensor.
p
Fig. 40 "Constant pressure"
Controller settings
For recommended controller settings, see section
17.18 "Controller"("Controller settings").
Constant pressure
●
●
Q
setup.
p
33