10
6.1 Control modes
A GRUNDFOS MAGNA pump can be set to the con-
trol mode which is most suitable for the individual
system.
Possible control modes:
•AUTO
ADAPT (factory setting)
• Proportional pressure
• Constant pressure.
Each of the control modes can be combined with au-
tomatic night-time duty, see section 6.3 Automatic
night-time duty.
AUTO
ADAPT
To be set on the control panel or with the R100, see
section 7. Setting the pump.
The control mode AUTO
ADAPT continuously adapts
the pump performance.
The setpoint of the pump has been factory-set as fol-
lows and cannot be changed manually:
• MAGNA 25-100, 32-100, 40-100(D), 50-100 to
5.5 metres.
• MAGNA 25-60, 32-60 to 3.5 metres.
When the pump registers a lower pressure on the
max. curve, A
2
, the AUTOADAPT function automati-
cally selects a correspondingly lower control curve,
H
set2
, thus reducing the energy consumption.
.
Fig. 3 AUTOADAPT
A
1
: Original duty point.
A
2
: Lower registered pressure on the max.
curve.
A
3
: New duty point after AUTOADAPT control.
H
set1
: Original setpoint.
H
set2
: New setpoint after AUTOADAPT control.
H
fac.
: Factory-set setpoint.
The AUTO
ADAPT function can be reset by pressing
the button for approx. 10 seconds until the control
mode is back to the starting point (AUTO
ADAPT or
AUTO
ADAPT with automatic night-time duty).
Proportional-pressure control:
To be set on the control panel or with the R100, see
section 7. Setting the pump.
The pump head is reduced at decreasing water de-
mand and increased at rising water demand, see
fig. 4.
Constant-pressure control:
To be set on the control panel or with the R100, see
section 7. Setting the pump.
The pump maintains a constant pressure, irrespec-
tive of water demand, see fig. 4.
Fig. 4 Pressure control
TM02 0251 4800
Q
H
H
max.
H
fac.
A
1
A
3
A
2
H
set1
H
set2
TM00 5546 4596
2
H
Q
H
Q
Proportional
pressure
Constant
pressure
H
set
H
set
H
set
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