Grundfos TPE 2 Series - Operating Range; External Setpoint Function

English (GB)
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14.16 Operating range
Set the operating range as follows:
• Set the minimum speed within the range from fixed minimum
speed to user-set maximum speed.
• Set the maximum speed within the range from user-set
minimum speed to fixed maximum speed.
The range between the user-set minimum and maximum speeds
is the operating range. See fig. 58.
Fig. 58 Example of minimum and maximum settings
Factory setting
See section 31. Factory settings.
14.17 External setpoint function
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.
If more than one input has been set to "Setpoint influence", the
function will select the analog input with the lowest number, for
example "Setting of pump", and ignore 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.
Fig. 59 Example of setpoint influence with sensor feedback
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 fig. 60.
Fig. 60 Example of setpoint influence with constant curve
Factory setting
See section 31. Factory settings.
Pump variant Operating range
TPE3, TPE3 D 
TPE2, TPE2 D 
Note
Speeds below 25 % may result in noise from the
shaft seal.
TM00 6785 5095
Pump variant External setpoint function
TPE3, TPE3 D 
TPE2, TPE2 D 
Note
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 14.8 Analog inputs and
14.10 Pt100/1000 inputs.
Fixed maximum speed
User-set maximum speed
Operating range
User-set minimum speed
Fixed minimum speed
24 %
13 %
0 %
67 %
100 %
TM06 4165 1615
Note
The maximum curve will in some cases be limited to
a lower speed. See fig. 53.
TM06 4525 2515
100
0
100 %
0
1.2
2
[bar]
0
3.5 V0.5
5 V0
10 V0
20 mA0
20 mA4
-50 204 C
Actual
input
signal
(60 %)
External
setpoint
signal
Setpoint
Sensor max.
Sensor min.
Actual
Setpoint
100
0
100 %
0
3.5 V0.5
5 V0
10 V0
20 mA0
20 mA4
-50 204 C
25
61
85
External
setpoint
signal
Speed [%]
Fixed
maximum
speed
Actual
input
signal
(60 %)
User-set min.
speed
Setpoint
Actual setpoint