Grundfos Control MPC-Serie Installationsanleitung Seite 36

8.7.10 Proportional pressure (4.1.7)
Fig. 47 Proportional pressure
Description
The function can only be enabled in pressure-controlled systems
and it automatically adapts the setpoint to the actual flow rate to
compensate for flow-dependent dynamic losses. As many
systems are designed with extra flow capacity, the estimated
maximum flow rate (Qpmax) can be entered manually. In systems
with CR pumps, the pump curves can be used to calculate the
maximum flow rate at the selected setpoint. Set a filter factor to
prevent fluctuation.
If the multisensor function is enabled, it will have a
higher priority than the proportional pressure which
will be overruled.
The adaptation can be linear or square. See fig. 47.
H
C B
A
Fig. 48 Proportional pressure
Pos. Description
Pressure at zero flow. Starting point of proportional-
A pressure control (influence at zero flow = x % of
setpoint)
B Qpmax
C Setpoint
The function has these purposes:
• to compensate for pressure losses
• to reduce the energy consumption
• to increase the comfort for the user.
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Setting range
• Selection of control mode
• Influence at 0 flow
• Estimated flow rate
• Filter factor.
Setting via the operating panel
• Settings > Primary controller > Proportional pressure.
1. Select: Enabled.
2. Select:
• Adaptation
• Linear or Square.
3. Set: Influence at 0 flow.
4. Set: Filter factor.
5. Select: Use pump curve or Enter value.
6. Set "Qpmax" if you select "Enter value".
Factory setting
The function is disabled.
Q