Grundfos Control MPC Montage- Und Betriebsanleitung Seite 551

Input [%] from external controller
: These settings must be made in connection with open loop
Proceed as follows to set an external control source to control the
. Operation > Further settings > Control mode
. Set to 100 %: Set setpoint 1, open loop
Settings > Primary controller > External setpoint influence >
. Select Settings analog input and range
. Measured input value. Display 4.3.8.1.1 appears
. Set the minimum and maximum sensor value
Input value to be influenced by
Select: Set the influence function. See also section Setting of
. Repeat step 14 for all selected points
. The system can now be controlled by an external controller
516
‫الوصف‬ ‫الوضع‬
3
X
Flow rate [m /h]
Y
Flow rate F
Pump 1-4 1-4
Setting range
Open loop
Set setpoint 1, open loop
External setpoint influence
. Normal
Setting via the operating panel
: system
. Select: Open loop
. Press × 2
Select: Stop
. Go to setting of analog input
: Select
•
. Select: 0-100 % signal •
. Press
Press × 2
: Select
•
. signal % 0-100 •
. Press
. influence function (4.1.3.2)
. Set the number of points
: Set for Point 1
External input value •
Reduce setpoint to •
. Press
. Set as seconds: Filter time
. Select: Enabled
. Press × 2
: Select
Operation •
. Normal •
‫المصنع‬ ‫إعدادات‬
. Closed loop
. Operation > Further settings > Control mode > Closed loop
Set the setpoint. See sections Operation (2) and Alternative
•
•
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
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
•
1 .
2 .
3 .
4 .
5 .
6 .
7 .
8 .
Y
9 .
. 10
. 11
. 12
. 13
. 14
0
5
. 15
. 16
. 17
. 18
. 19
. 20
Y
100
75
50
25
5
Regulation curve for MPC-E system in open loop
‫الوصف‬
Time [sec]
P [bar]
Setpoint
Setting via the operating panel
. setpoints (2.1.3)
. with the flow rate
. such cases MPC is like an actuator
System with external controller (open loop)
X
Regulation curve for open loop
‫الوصف‬
Input [%] from external controller
3
Flow rate [m /h]
X
50 70.7 86.6 100
‫الوضع‬
X
Y
A
•
Open loop
‫الوضع‬
X
Y
F
1
2
3
4