Grundfos TPE2 - External Setpoint Function

17.19 External setpoint function
Pump variant External setpoint function
TPE3, TPE3 D ●
TPE2, TPE2 D ●
You can influence the setpoint by an external signal,
either via one of the analog inputs or, if an advanced
functional module is fitted, via one of the Pt100/1000
inputs.
Before you can enable the External
setpoint function, you must set one of
the analog inputs or Pt100/1000 inputs to
Setpoint influence.
See sections Analog inputs and
Pt100/1000 inputs.
If more than one input has been set to Setpoint
influence, the function selects the analog input with
the lowest number, for example Setting of pump,
and ignores the other inputs, for example Analog
input 3 or "Pt100/1000 input 1".
Example with constant pressure with linear
influence
Actual setpoint: actual input signal x (setpoint -
sensor min.) + sensor min.
At a lower sensor value of 0 bar, a setpoint of 2 bar
and an external setpoint of 60 %, the actual setpoint
is 0.60 x (2 - 0) + 0 = 1.2 bar.
100
0
100 %
0
1.2
2
[bar]
0
3.5 V0.5
5 V0
10 V0
20 mA0
20 mA4
-50 204 C
D
C
E
F
A
B
TM064165
Example of setpoint influence with sensor feedback
Pos. Description
A Actual input signal, 60 %
B External setpoint signal
C Setpoint
Pos. Description
D Sensor max.
E Sensor min.
F Actual Setpoint
Example with constant curve with linear influence
Actual setpoint: actual input signal x (setpoint - user-
set minimum speed) + user-set minimum speed.
At a user-set minimum speed of 25 %, a setpoint of
85 % and an external setpoint of 60 %, the actual
setpoint is 0.60 x (85 - 25) + 25 = 61 %. See figure
Example of setpoint influence with constant curve.
In some cases, the maximum curve is limited to a
lower speed. See figure Power and pressure
limitations influencing the maximum curve.
100
0
100 %
0
3.5 V
0.5
5 V
0
10 V
0
20 mA
0
20 mA
4
-50
204 C
25
61
85
AD
E
G
F
B
C
TM064525
Example of setpoint influence with constant curve
Pos. Description
A External setpoint signal
B Speed [%]
C Fixed maximum speed
D Actual input signal, 60 %
E User-set min. speed
F Setpoint
G Actual setpoint
Factory setting
See section Factory settings.
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