Pos. Description
X: External input signal from 0 to 100 %
Y: Setpoint influence from 0 to 100 %
9.19 Predefined setpoints
You can set and activate seven predefined setpoints
by combining the input signals with digital inputs 2, 3
and 4 as shown in the table below. Set the digital
inputs 2, 3 and 4 to Predefined setpoints if all seven
predefined setpoints are to be used. You can also set
one or two of the digital inputs to Predefined
setpoints. However, this limits the number of
predefined setpoints available.
Digital inputs
Setpoint
2 3 4
0 0 0 Normal setpoint or Stop
1 0 0 Predefined setpoint 1
0 1 0 Predefined setpoint 2
1 1 0 Predefined setpoint 3
0 0 1 Predefined setpoint 4
1 0 1 Predefined setpoint 5
0 1 1 Predefined setpoint 6
1 1 1 Predefined setpoint 7
0: Open contact
1: Closed contact
Example
The figure shows how you can use the digital inputs
to set seven predefined setpoints. Digital input 2 is
open, and digital inputs 3 and 4 are closed. If you
compare with the table above, you can see that
Predefined setpoint 6 is activated.
0
1
2
3
4
5
6
7
DI 4
DI 2
DI 3
SP A
Stop
SP N
SP 1
SP 2
SP 4
SP 5
SP 6
SP 7
SP 3
TM070083
Pos.
Description
DI Digital input
SP Setpoint
SP
A
Actual setpoint
SP
N
Normal setpoint
Stop Stop
If all digital inputs are open, the motor stops or runs at
the normal setpoint. Set the desired action with
Grundfos GO or with the HMI 300 or 301 operating
panel.
9.20 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 °C 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.
H
T [°C]
30 %
20 50 80
100 %
H
actual
T
actual
H
Q
176T [°F]
TM057911
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 or constant-pressure control
mode
• pump installed in flow pipe
• system with flow-pipe temperature control.
Temperature influence is suitable for the following
systems:
• Systems with variable flow rates, for example two-
pipe heating systems, in which the enabling of the
temperature influence function ensures a further
65
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