Control Modes - Grundfos MAGNA 2000 Serie Notice D'installation Et D'entretien

7.1 Control modes

A GRUNDFOS MAGNA pump can be set to the
control mode which is most suitable for the individual
system.
Possible control modes:
• AUTO (factory setting)
ADAPT
• Proportional pressure
• Constant pressure.
Each of the control modes can be combined with
automatic night-time duty, see section 7.3 Automatic
night-time duty.
AUTO
ADAPT
To be set on the control panel or with the R100, see
section 8. Setting the pump.
The control mode AUTO
the pump performance.
The setpoint (H ) of the pump has been factory-
set1
set as follows and cannot be changed manually:
• MAGNA 40-120, 65-120 to 21 feet (6.5 m).
• MAGNA 65-60 to 11.5 feet (3.5 m).
When the pump registers a lower pressure on the
max. curve, A , the AUTO
2
automatically selects a correspondingly lower control
curve, H , thus reducing the energy consumption.
set2
H
max.
H
fac.
A
1
Fig. 8 AUTO
ADAPT
A : Original duty point.
1
A : Lower registered pressure on the max. curve.
2
A : New duty point after AUTO
3
H : Original setpoint.
set1
H : New setpoint after AUTO
set2
H : Factory-set setpoint.
fac.
The AUTO function can be reset by pressing
ADAPT
the button for approx. 10 seconds until the control
mode is back to the starting point (AUTO
AUTO with automatic night-time duty).
ADAPT
10
continuously adapts
ADAPT
function
ADAPT
H
set1
H
set2
A
A 2
3
control.
ADAPT
control.
ADAPT
or
ADAPT
Proportional-pressure control
To be set on the control panel or with the R100, see
section 8. Setting the pump.
The pump head is reduced as the water demand
declines and increased as the water demand rises,
see fig. 9.
Constant-pressure control
To be set on the control panel or with the R100, see
section 8. Setting the pump.
The pump maintains a constant pressure,
irrespective of water demand, see fig. 9.
H
H
set
H
set
2
2
Proportional
pressure
Fig. 9 Pressure control
H
H
set
Q
Constant
pressure
Q