Grundfos TPE - Page 28

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28
Example
See fig. 36.
At a lower sensor value of 0 bar, a set setpoint of 2 bar and an
external setpoint of 60 %, the actual setpoint is 0.60 x (2 - 0) + 0 =
1.2 bar.
Actual setpoint = actual input signal x (setpoint - lower value) +
lower value.
Fig. 36 Example of setpoint influence
Types of setpoint influence
• Not active
• Linear function
• Linear with Stop
• Linear with Min.
• Inverse function
• Inverse with Stop
• Inverse with Min.
• Influence table
• Influence table with Stop at Min.
• Influence table with Stop at Max.
These functions can be selected:
• Not active
When set to "Not active", the setpoint will not be influenced
from any external function.
• Linear function
The setpoint is influenced linearly from 0 to 100 %. See fig. 37.
Fig. 37 Linear function
•"Linear with Stop" and "Linear with Min."
– Linear with Stop
In the input signal range from 20 to 100 %, the setpoint is
influenced linearly.
If the input signal is below 10 %, the pump will change to
operating mode "Stop".
If the input signal is increased above 15 %, the operating
mode will be changed back to "Normal".
See fig. 38.
– Linear with Min.
In the input signal range from 20 to 100 %, the setpoint is
influenced linearly.
If the input signal is below 10 %, the pump will change to
operating mode "Min.".
If the input signal is increased above 15 %, the operating
mode will be changed back to "Normal".
See fig. 38.
Fig. 38 "Linear with Stop" and "Linear with Min."
• Inverse function
The setpoint is influenced inversely from 0 to 100 %.
See fig. 39.
Fig. 39 Inverse function
TM05 6279 4612
TM05 6280 4612
100
0
0 100
0
1.2
2
[bar]
Setpoint influence [%]
External
setpoint
signal [%]
Actual
input
signal
Actual setpoint
Setpoint
Upper value
Lower value
100
0
100
20 40 60 80
Setpoint influence [%]
External input
[%]
TM05 6281 4612TM05 6283 4612
100
0
100
20 40 60 80
Setpoint influence [%]
External
input [%]
Normal
Min. or
Stop
100
0
100
20 40 60 80
Setpoint influence [%]
External input
[%]