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Setting range
Setting via the operating panel
System without flow switch or flowmeter
• Settings > Secondary functions > Stop function.
• Select: Enabled.
1. Set: Start/stop band.
2. Select: Go to setting of flow stop parameters.
Fig. 67 Stop parameters
3. Select one of the stop parameters. If you select "Customised
settings", you must set the parameters shown in fig. 68. See
the examples below.
Fig. 68 Customised settings
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 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".
Alternative input
If you select "Alternative input", the controller calculates the stop
parameters based on the following inputs:
• system set-point
• total tank volume
• precharge pressure
• desired stop flow.
Fig. 69 Alternative input
Start/stop band: 5-30 %
Minimum flow rate:
2-50 % of the rated flow rate (Qnom) of
one of the pumps. (It can only be set if
direct flow measurement by means of
flowmeter has been selected.)
Distribution above
setpoint:
0-100 %.
Rule of thumb: Speed reduction = 2 x delta pressure
for gradient.
Example of increased stop limit
Parameter Value
Delta pressure for gradient 6 %
Delta time for gradient (pump stopped) 1.5 seconds
Delta time for gradient (pump running) 2.0 seconds
Speed reduction 10 %
Example of reduced flow limit
Parameter Value
Delta pressure for gradient 3 %
Delta time for gradient (pump stopped) 15.0 seconds
Delta time for gradient (pump running) 25.0 seconds
Speed reduction 6 %
The stop limit depends on the tank size.
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