Control Mode - Grundfos MAGNA3 Montage- Und Betriebsanleitung

12.3 Control mode

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Control mode
• AUTO
ADAPT
• FLOW
ADAPT
Prop. press. (proportional pressure)
•
Const. press. (constant pressure)
•
Const. temp.(constant temperature)
•
Constant curve.
•
The operating mode must be set to "
Note
before a control mode can be enabled.
Setting:
1. Select control mode with
2. Press [OK] to enable.
The setpoint for all control modes, except AUTO
,
FLOW can be changed in the "Setpoint" submenu under
ADAPT
"Settings" when the desired control mode has been selected.
All control modes, except "Constant curve", can be combined with
Automatic Night Setback. See section 12.5 Automatic Night
Setback.
The FLOW function can also be combined with the last four
LIMIT
control modes mentioned above. See section 12.4 FLOWLIMIT.
12.3.1 AUTO
ADAPT
The AUTO control mode continuously adapts the pump
ADAPT
performance according to the actual system characteristic.
Note
Manual setting of the setpoint is not possible.
H
H
fac
A
1
H
auto_min
A
Fig. 19 AUTO
ADAPT
When the AUTO control mode has been enabled, the pump
ADAPT
will start with the factory setting, H
approx. 55 % of its maximum head, and then adjust its
performance to A . See fig. 19.
1
When the pump registers a lower head on the max. curve, A
AUTO function will automatically select a correspondingly
ADAPT
lower control curve, H . If the valves in the system close, the
set2
pump will adjust its performance to A
26
Normal
"
or .
and
ADAPT
H
set1
H
set2
A
3
2
Q
= H , corresponding to
fac set1
, the
2
.
3
A : Original duty point.
1
A : Lower registered head on the max. curve.
2
A : New duty point after AUTO
3
H : Original setpoint setting.
set1
H : New setpoint after AUTO
set2
H : MAGNA3 xx-40: 2.5 m
fac.
MAGNA3 xx-60: 3.5 m
MAGNA3 xx-80: 4.5 m
MAGNA3 xx-100: 5.5 m
MAGNA3 xx-120: 6.5 m
MAGNA3 xx-150: 8.0 m
MAGNA3 xx-180: 9.5 m.
H : A fixed value of 1.5 m.
auto_min
The AUTO control mode is a form of proportional-pressure
ADAPT
control where the control curves have a fixed origin, H
The AUTO control mode has been developed specifically
ADAPT
for heating systems and is not recommended for air-conditioning
and cooling systems.
To reset AUTO , see section 12.9.8 Return to factory
ADAPT
settings.
12.3.2 FLOW
ADAPT
When FLOW is selected, the pump will run AUTO
ADAPT
ensure that the flow never exceeds the entered FLOW
The setting range for the FLOW
the pump.
The factory setting of the FLOW
AUTO factory setting meets the max. curve. See fig. 20.
ADAPT
H
25 %
Setting range
H
fac
H
auto_min
Fig. 20 FLOW
ADAPT
12.3.3 Proportional pressure
The pump head is reduced at decreasing water demand and
increased at rising water demand. See fig. 21.
The setpoint can be set within the range from 1 metre to approx.
1 metre below the maximum head, depending on pump type.
H
H
set
H
set
2
Fig. 21 Proportional pressure
control.
ADAPT
control.
ADAPT
.
auto_min
and
ADAPT
value.
LIMIT
is 25 to 90 % of the Q
LIMIT max
is the flow where the
LIMIT
Q
90 %
max
Q
Q
fac
Q
of