Overview Of The Control Functions - Grundfos MAGNA1 C Series Installation And Operating Instructions Manual

7.4 Overview of the control functions

H
Fig. 29 Control function in relation to system requirements
Setting Pump curve
Lowest proportional-pressure
PP1
curve
Intermediate
PP2
proportional-pressure curve
Highest
PP3
proportional-pressure curve
Lowest constant-pressure
CP1
curve
Intermediate
CP2
constant-pressure curve
Highest constant-pressure
CP3
curve
III Speed III
II Speed II
I Speed I
I
Function
The duty point of the pump will move up or down on the lowest proportional-pressure curve,
depending on the flow rate demand.
The head is reduced at falling flow rate demand and increased at rising flow rate demand.
The duty point of the pump will move up or down on the intermediate proportional-pressure
curve, depending on the flow rate demand.
The head is reduced at falling flow rate demand and increased at rising flow rate demand.
The duty point of the pump will move up or down on the highest proportional-pressure curve,
depending on the flow rate demand.
The head is reduced at falling flow rate demand and increased at rising flow rate demand.
The duty point of the pump will move out or in on the lowest constant-pressure curve,
depending on the flow rate demand in the system.
The head is kept constant, irrespective of the flow rate demand.
The duty point of the pump will move out or in on the intermediate constant-pressure curve,
depending on the flow rate demand in the system.
The head is kept constant, irrespective of the flow rate demand.
The duty point of the pump will move out or in on the highest constant-pressure curve,
depending on the flow rate demand in the system.
The head is kept constant, irrespective of the flow rate demand.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed III, the pump is set to run on the maximum curve under all operating conditions.
You obtain quick venting of the pump by setting the pump to speed III for a short period.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed II, the pump is set to run on the intermediate curve under all operating conditions.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed I, the pump is set to run on the minimum curve under all operating conditions.
PP3
CP3
PP2
CP2
PP1
CP1
III
II
Q
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