Grundfos TPE 1000 Serie Instrucciones De Instalación Y Funcionamiento página 24

Example
See fig. 35.
At a lower sensor value of 0 psi, a set setpoint of 29 psi and an
external setpoint of 60 %, the actual setpoint is 0.60 x (29 - 0) + 0
= 17.4 psi.
Actual setpoint = actual input signal x (setpoint - lower value) +
lower value.
[PSI]
Upper value
Setpoint influence [%]
Setpoint
29 100
Actual setpoint
17.4
Lower value
0 0
Fig. 35 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. 36.
Setpoint influence [%]
100
0
20 40 60
Fig. 36 Linear function
24
Actual External
0 100
input setpoint
signal signal [%]
External input
80 100
[%]
"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. 37.
– 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. 37.
Setpoint influence [%]
100
0
20 40
Normal
Min. or
Stop
Fig. 37 "Linear with Stop" and "Linear with Min."
Inverse function
•
The setpoint is influenced inversely from 0 to 100 %.
See fig. 38.
Setpoint influence [%]
100
0
20 40 60
Fig. 38 Inverse function
External
60 80 100
input [%]
80 100 External input
[%]