Additional Control Mode Features - Grundfos MAGNA3 Manual

4

Additional control mode features

MAGNA3 offers additional features for the control
modes to meet specific demands.
FLOW
LIMIT
The feature is an integrated part of the FLOW
control mode, but is also advantageous in:
• proportional-pressure mode
• constant-pressure mode
• constant-temperature mode
• constant-curve mode.
Characteristics and key benefits
• A control mode feature that, when activated,
ensures that the rated maximum flow is never
exceeded.
• By enabling FLOW
has full authority, the rated flow is never exceeded,
thus eliminating the need for throttling valves.
Technical specifications
H
25 %
Fig. 27 FLOW
LIMIT
The setting range for the FLOW
the Q of the pump.
max
Note: Do not set the FLOW
dimensioned duty point.
In the flow rate range between 0 and Q
will run according to the selected control mode.
22
ADAPT
in systems where MAGNA3
LIMIT
Q Q
90 %
max max
Setting range
Q
Q
limit
is 25 to 90 % of
LIMIT
lower than the
LIMIT
, the pump
limit
When Q is reached, the FLOW
limit
reduce the pump speed to ensure that the flow rate
never exceeds the FLOW
LIMIT
system requires a higher flow rate due to an increased
resistance in the system. See figs 28,
H
H
set
H
set
2
Fig. 28 Proportional-pressure control with FLOW
H
H
set
Fig. 29 Constant-pressure control with FLOW
H
Fig. 30 Constant curve with FLOW
MAGNA3
function will
LIMIT
set, no matter if the
29 and 30.
Normal proportional-pressure
duty point
FLOW duty point
LIMIT
Q
LIMIT
Normal constant-pressure
duty point
FLOW duty point
LIMIT
Q
LIMIT
Normal constant-curve
duty point
FLOW duty point
LIMIT
Q
LIMIT