Grundfos Control MPC Montage- Und Betriebsanleitung Seite 32

8.7.5 External setpoint influence (4.1.3)
Fig. 41 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 9. Measuring parameters
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:
Actual setpoint (SP) =
selected setpoint x influence (1) x influence (2) x ...
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
• 0-100 % signal
• Inlet pressure
• Discharge pressure
• External pressure
• Diff. pressure, external
• Diff. pressure, pump
• Flow rate
• Tank level, discharge side
• Tank level, suction side
• Return-pipe temp., external
• Flow-pipe temperature
• Return-pipe temperature
• Differential temperature
• Ambient temperature
• Differential temperature.
32
Setting via control panel
• Settings > Primary controller > External setpoint influence >
Input value to be influenced by.
A list of available parameters appears.
1. Select the parameter which is to influence the setpoint.
2.
3. Set the influence function.
(See section 8.7.6.)
4. Set the number of points.
5. Set: External input value. (Point 1.)
6. Set as a percentage: Reduce setpoint to. (Point 1.)
7. Repeat steps 4 to 6 for all desired parameters.
8.
9. Set as seconds: Filter time.
10. Select: Enabled.
Factory setting
The function is disabled.
shows an overview
.
.