Setting Of Influence Function; Primary Sensor; Relation Between Setpoint Influence And Flow Rate - Grundfos Control MPC Installation And Operating Instructions Manual

8.7.6 Setting of influence function (4.1.3.2)

Fig. 42 Setting of influence function
Description
It is possible to select the relation between the measuring
parameter which is to influence the setpoint and the desired
influence as a percentage.
The relation is set by entering values in a table with maximum
eight points by means of the control panel.
Example:
Setpoint influence [%]
100
80
60
2
40
1
20
Fig. 43 Relation between setpoint influence and flow rate
The control unit draws straight lines between the points.
A horizontal line is drawn from the minimum value of the relevant
3
sensor (0 m /h in the example) to the first point. This is also the
case from the last point to the sensor's maximum value (example
3
50 m /h).
Setting range
Two to eight points can be selected. Each point contains the
relation between the value of the parameter which is to influence
the setpoint and the influence of the value.
30
4
3
50
3
Flow rate [m /h]
Setting via control panel
• Settings > Primary controller > External setpoint influence.
1. Set the influence function.
2. Set the number of points.
3. Set: External input value. (Point 1.)
4. Set as a percentage: Reduce setpoint to. (Point 1.)
5. Repeat steps 2 to 4 for all desired parameters.
Factory setting
The function is disabled.

8.7.7 Primary sensor (4.1.4)

Fig. 44 Primary sensor
Description
You can select the control parameter of the system and set the
sensor to measure the value.
Setting range
• Discharge pressure
• Diff. pressure, external
• Diff. pressure, pump
• Series 2000, diff. pressure
• External pressure
• Diff. pressure, inlet
• Diff. pressure, outlet
• Flow rate
• Series 2000, flow rate
• Flow-pipe temperature
• Return-pipe temperature
• Differential temperature
• Ambient temperature
• Return-pipe temp., external
• 0-100 % signal
• Not used.