10
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
ADAPT (factory setting)
• 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
ADAPT continuously adapts
the pump performance.
The setpoint (H
set1
) of the pump has been factory-
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
2
, the AUTOADAPT function
automatically selects a correspondingly lower control
curve, H
set2
, thus reducing the energy consumption.
Fig. 8 AUTO
ADAPT
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 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.
Fig. 9 Pressure control
TM02 0251 4800
H
max.
H
fac.
A
1
A
3
A
2
H
set2
H
set1
TM00 5546 4596
Proportional
pressure
Constant
pressure
H
set
H
set
H
set
2
Grundfos.bk Page 10 Friday, January 15, 2010 3:23 PM
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