Grundfos TPE3 - Page 27

27
English (US)
15.4.2 FLOW
ADAPT
When you select FLOW
ADAPT
, the pump will run AUTO
ADAPT
and
ensure that the flow never exceeds the entered FLOW
LIMIT
value.
The setting range for FLOW
LIMIT
is 25 to 90 %, of the Q
max
of the
pump.
The factory setting of the FLOW
LIMIT
is the flow where the
AUTO
ADAPT
factory setting meets the maximum curve.
See fig. 36.
Fig. 36 FLOW
ADAPT
15.4.3 Proportional pressure
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 will increase 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, H
set
.
Fig. 37 Proportional pressure
Fig. 38 Proportional pressure
15.4.4 Constant pressure
The pump maintains a constant discharge pressure,
independently of the flow rate. See fig. 39.
Fig. 39 Constant pressure
This control mode requires an external pressure sensor as shown
in the examples below:
Fig. 40 Constant pressure
Pump variant FLOW
ADAPT
TPE3 (D) ●
TPE2 (D) -
Note
Note
Do not set the FLOW
LIMIT
lower than the
dimensioned duty point.
TM05 7912 1613
Pump variant Proportional pressure
TPE3 (D) ●
TPE2 (D) -
TM05 7909 1613
H
Q
Q
max
25 %
90 %
H
auto_min
H
fac
Q
fac
Setting range
H
Q
Hset
Hset
2
Example
• Factory-fitted differential-pressure sensor.
Pump variant Constant pressure
TPE3 (D) -
TPE2 (D) ●
TM05 7901 1613
Examples
• One external pressure sensor.
p
H
Q
p
p