Grundfos Control MPC Montage- Und Betriebsanleitung Seite 435

Поз. Опис
X Time [sec]
Y P [bar]
A Setpoint
Setting via the operating panel
• Operation > Further settings > Control mode > Closed loop.
Set the setpoint. See sections Operation (2) and Alternative
setpoints (2.1.3).
Open loop
In open-loop control mode, the pumps run at a fixed speed. The
pump speed is calculated from the performance set by the user
(0-100 %). The pump performance in percentage is proportional
with the flow rate.
Open-loop control mode is usually used when the system is
controlled by an external controller which controls the performance
via an external signal. The external controller could for instance be
a building management system connected to the MPC system. In
such cases MPC is like an actuator.
System with external controller (open loop)
Y
0
5
Regulation curve for open loop
Поз. Опис
X Input [%] from external controller
3
Y
Flow rate [m /h]
Y
100
75
50
25
5 50
Regulation curve for MPC-E system in open loop
X
F
1
2
3
4
X
70.7 86.6 100
Поз. Опис
3
X
Flow rate [m /h]
Y Input [%] from external controller
F Flow rate
1-4 Pump 1-4
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 × 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 Settings analog input and range.
6. Select:
• Measured input value. Display 4.3.8.1.1 appears.
• Select: 0-100 % signal.
7. Press .
8. Set the minimum and maximum sensor value.
9. Press × 2
10. Select:
• Input value to be influenced by
• 0-100 % signal.
11. Press .
12. Select: Set the influence function. See also section 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 .
17. Set as seconds: Filter time.
18. Select: Enabled.
19. Press × 2.
20. Select:
• Operation
• Normal.
The system can now be controlled by an external controller.
Заводські налаштування
Closed loop.
435