Grundfos MAGNA 25-100, Installation And Operating Instructions Manual

Page: 10 / 34

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 of the pump has been factory-set as
follows 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.
• MAGNA 25-40, 32-40 to 2.5 metres.
When the pump registers a lower pressure on the
max. curve, A
2
, the AUTO
ADAPT
function
automatically selects a correspondingly lower control
curve, H
set2
, thus reducing the energy consumption.
Fig. 3 AUTO
ADAPT
A
1
: Original duty point.
A
2
: Lower registered pressure on the max.
curve.
A
3
: New duty point after AUTO
ADAPT
control.
H
set1
: Original setpoint.
H
set2
: New setpoint after AUTO
ADAPT
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 at decreasing water
demand 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
8. Setting the pump.
The pump maintains a constant pressure,
irrespective of water demand, see fig. 4.
Fig. 4 Pressure control
T
M
02
02
51
48
00
Q
H
H
max.
H
fac.
A
1
A
3
A
2
H
set2
H
set1
TM
00
55
46
45
96
2
H
Q
H
Q
H
set
H
set
H
set
Proportional
pressure Constant
pressure