Grundfos Control MPC Montage- Und Betriebsanleitung Seite 46

Example 1: Increasing the stop limit, Qmin (high flow limit)
• Increase Delta pressure for gradient.
• Reduce Delta time for gradient (pump stopped).
• Reduce Delta time for gradient (pump running).
• Increase Speed reduction.
Example of increased stop limit
Parameter
Delta pressure for gradient
Delta time for gradient (pump stopped)
Delta time for gradient (pump running)
Speed reduction
Example 2: Reducing the stop limit, Qmin (low flow limit)
• Reduce Delta pressure for gradient.
• Increase Delta time for gradient (pump stopped).
• Increase Delta time for gradient (pump running).
• Reduce Speed reduction.
Example of reduced flow limit
Parameter
Delta pressure for gradient
Delta time for gradient (pump stopped)
Delta time for gradient (pump running)
Speed reduction
The stop limit depends on the tank size.
Alternative input
If you select Alternative input, the controller calculates the stop
parameters based on the following inputs:
• system setpoint
• total tank volume
• precharge pressure
• desired stop flow.
Alternative input
System with flow switch
Make the following additional settings:
46
1. Select: Go to setting of digital input. Display Digital inputs
(4.3.7) appears.
2. Select the digital input where the flow switch is connected.
3. Select: Flow switch.
4. Press .
Value
6 %
1.5 seconds
2.0 seconds
10 %
Value
3 %
15.0 seconds
25.0 seconds
6 %
System with flow switch
System with flowmeter
Make the following additional settings:
1. Select: Go to setting of analog input. The display Analog
inputs (4.3.8) appears.
2. Select the analog input where the flowmeter is connected.
3. Select: Flow rate.
4. Press
System with flowmeter
5. Set: Stop limit.
An open contact indicates low flow.
× 2.