Grundfos Control MPC Montage- Und Betriebsanleitung Seite 34

8.6.6 Setting of influence function (4.1.3.2)
Setting of influence function
Description
You can 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 operating panel.
Example:
Y
100
80
60
2
40
1
20
Relation between setpoint influence and flow rate
Pos. Description
3
X
Flow rate [m /h]
Y Setpoint influence [%]
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.
Setting via the operating 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).
34
4
3
50 X
5. Repeat steps 2 to 4 for all desired parameters.
Factory settings
The function is disabled.
8.6.7 Primary sensor (4.1.4)
Primary sensor
Description
You can select the control parameter of the system and set the
sensor to measure the value.
Setting range
• Outlet 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.
Setting via the operating panel
• Settings > Primary controller > Primary sensor > Go
to setting of analog input. Display Analog inputs (4.3.8)
appears.
1. Select analog input (AI) for the primary sensor and set the
parameters.
2. Press .
3. Select control parameter for the primary sensor.
Factory settings
The primary parameter is the outlet pressure. The sensor is
connected to AI1 (CU 352). Other primary parameters can be
selected in the startup wizard.
Related information
8.6.30 Analog inputs (4.3.8)