Grundfos Control MPC 2000 Series, Installation And Operating Instructions Manual, Page: 25 / 528

English (GB)
25
Fig. 25 Regulation curve for MPC-F system in open loop
Fig. 26 Regulation curve for MPC-S system in open loop
Setting range
These settings must be made in connection with open loop:
• Open loop
• Set setpoint 1, open loop
• External setpoint influence
• Normal.
Setting via the operating panel
Proceed as follows to set an external control source to control the
system:
• Operation > Further settings > Control mode.
• Select: Open loop.
1. Press [Back] x 2.
2. Select: Stop
3. Set to 100 %: Set setpoint 1, open loop.
4. Settings > Primary controller > External setpoint influence >
Go to setting of analog input.
5. Select analog input and range.
6. Select:
• Measured input value. Display 4.3.8.1.1 appears.
• Select: 0-100 % signal.
7. Press [Back].
8. Set the minimum and maximum sensor value.
9. Press [Back] x 2.
10. Select:
• Input value to be influenced by
• 0-100 % signal.
11. Press.
12. Select: Set the influence function. See also section
8.7.6 Setting of influence function (4.1.3.2) .
13. Set the number of points.
14. Set for Point 1:
• External input value
• Reduce setpoint to
15. Repeat step 14 for all selected points.
16. Press [Back].
17. Set as seconds: Filter time.
18. Select: Enabled.
19. Press [Back] x 2.
20. Select:
• Operation
• Normal.
The booster system can now be controlled by an external
controller.
Factory setting
Closed loop.
T
M
03
9
9
7
5
48
07
T
M
03
9
9
7
4
48
07
100 50 70.7 5
25
50
75
100
86.6
Flow rate [m
3
/h]
Input [%] from
external controller
Pump 1
Pump 4
Pump 3
Flow rate
Pump 2
100 50 70.7 5
25
50
75
100
86.6
Flow rate [m
3
/h]
Input [%] from
external controller
Pump 1
Pump 4
Pump 3
Flow rate
Pump 2