Grundfos MAGNA3 D 32-80 180 97924451 [37/1656] Setpoint influence
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Grundfos MAGNA3 D 32-80 180 97924451 [37/1656] Setpoint influence

Grundfos MAGNA3 D 32-80 180 97924451 [37/1656] Setpoint influence
English (GB)
37
8.7.1 "Setpoint influence"
Navigation
"Home" > "Settings" > "Setpoint influence"
"Setpoint influence"
•"External setpoint function"
•"Temperature influence".
"External setpoint function"
An external 0-10 V or 4-20 mA signal controls the pump speed in
a range from minimum to 100 % in a linear function. See fig. 47.
If the analog input is set to external setpoint influence, the
external setpoint function is automatically activated with "Linear
with MIN". See section 7.4.3 Analog input.
Fig. 47 "External setpoint function", 0-10 V
The range of control depends on the minimum speed, power and
pressure limits of the pump.
You can configure the analog input to an external setpoint
function in "Settings" or in the "Assist" menu. See section
7.4.3 Analog input.
"Temperature influence"
When this function is enabled in proportional- or
constant-pressure control mode, the setpoint for head is reduced
according to the liquid temperature.
You can set the temperature influence to function at liquid
temperatures below 80 or 50 °C. These temperature limits are
called T
max.
. The setpoint is reduced in relation to the head set
which is equal to 100 %, according to the characteristics below.
Fig. 48 "Temperature influence"
In the above example, T
max.
, which is equal to 80 °C, has been
selected. The actual liquid temperature, T
actual
, causes the
setpoint for head to be reduced from 100 % to H
actual
.
The temperature influence function requires the following:
• proportional-pressure, constant-pressure or constant-curve
control mode
• pump installed in flow pipe
• system with flow-pipe temperature control.
Temperature influence is suitable for the following systems:
• Systems with variable flows for example two-pipe heating
systems, in which the enabling of the temperature influence
function ensures a further reduction of the pump performance
in periods with small heating demands and consequently a
reduced flow-pipe temperature.
• Systems with almost constant flows, for example one-pipe
heating systems and underfloor heating systems, in which
variable heating demands cannot be registered as changes in
the head as is the case with two-pipe heating systems. In such
systems, you can only adjust the pump performance by
enabling the temperature influence function.
Selection of maximum temperature
In systems with a dimensioned flow-pipe temperature:
• Up to and including 55 °C, select a maximum temperature
equal to 50 °C.
• Above 55 °C, select a maximum temperature
equal to 80 °C.
You cannot use the temperature influence function in
air-conditioning and cooling systems.
3.1.15.0.0.0 Setpoint influence
Range
4-20 mA [0-100 %]
0-10 V [0-100 %]
Control
0-20 % e.g. 0-2 V Setpoint is equal to minimum.
20-100 % e.g. 2-10 V
Setpoint is equal from
minimum to setpoint.
TM05 3219 1212
3.1.15.10.0 External setpoint function
rpm
V
Min.
02
Max.
10
TM05 3022 1212
H
T [°C]
30 %
20 50 80
100 %
H
actual
T
actual
H
Q

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