External Setpoint Influence (4.1 - Grundfos CONTROL MPC Installation And Operating Instructions Manual

11.7.5 External setpoint influence (4.1.3)

Fig. 36 External setpoint influence
Description
This function makes it possible to adapt the setpoint by letting
measuring parameters influence the setpoint. Typically an analog
signal from a flow or temperature transmitter, or a similar
transmitter. Section 12. Measuring parameters shows an
overview of transmitter types and possible positions.
As an example, the setpoint can be adapted to parameters that
can influence the discharge pressure or temperature of the
system. The parameters which influence the performance of the
system are shown as a percentage from 0 to 100 %. They can
only reduce the setpoint, as the influence as a percentage divided
with 100 is multiplied with the setpoint:
Setpoint Setpoint
=
( )
current SP
The influence values can be set individually.
A low-pass filter ensures smoothing of the measured value which
influences the setpoint. This results in stable setpoint changes.
Setting range
The following parameters can be selected.
• 0-100 % signal
• Inlet pressure
• Discharge pressure
• External pressure
• Differential pressure, pump
• Differential pressure, external
• Flow rate
• Tank level, discharge side
• Tank level, suction side
• Flow pipe temperature
• Return pipe temperature
• Ambient temperature
• Return pipe temperature, external
• Differential temperature.
28
× Infl. 1 ( ) × Infl. 2 ( ) ×
...
selected
Setting via control panel
1. Mark the Settings menu with
2. Mark Primary controller with
3. Mark External setpoint influence with
.
4. Mark Input value to be influenced by with
press .
Now a list of available parameters appear.
5. Mark the parameter which is to influence the setpoint with
or , and press .
6. Return with .
7. Mark Set the influence function with
. For details, see section 11.7.6 Setting of influence
function (4.1.3.2).
8. Mark the menu line for number of points with
press .
9. Select the required number of points with
save with .
10. Mark External input value (point 1) with
11. Set the value of the external input value with
save with .
12. Mark Reduce setpoint to (point 1) with
13. Set the value as a percentage with
.
14. Repeat steps 8 to 13 for all desired parameters.
15. Return with .
16. Mark Filter time with
or , and save with
17. Mark Activated with
mark in the right box shows that the function has been
activated.
Factory setting
Setpoint influence is not activated.
.
or , and press
or , and press
or
or , and press
or
or , and
or .
or
or .
or , and save with
or , set the time in seconds with
.
or , and press . The check
.
, and
, and
, and