Predefined Setpoints; Temperature Influence - Grundfos TPE2 D Manual Del Usuario

17.21 "Predefined setpoints"

Pump variant
TPE3,TPE3 D
TPE2,TPE2 D
You can set and activate seven predefined setpoints by
combining the input signals to 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" but this will
limit the number of predefined setpoints available.
Digital inputs
2 3 4
0 0 0
1 0 0
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1
0: Open contact
1: Closed contact
Example
Figure 65 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.
Digital input 4
Digital input 3
Digital input 2
Actual setpoint
Stop
Fig. 65 Principle sketch showing how predefined setpoints
function
If all digital inputs are open, the pump either stops or runs at the
normal setpoint. Set the desired action with Grundfos GO or with
the advanced control panel.
Factory setting

"Predefined setpoints"

●
●
Setpoint
Normal setpoint or stop
Predefined setpoint 1
Predefined setpoint 2
Predefined setpoint 3
Predefined setpoint 4
Predefined setpoint 5
Predefined setpoint 6
Predefined setpoint 7
Setpoint 7
Setpoint 6
7
6
5
Setpoint 5
4
Setpoint 4
3
Setpoint 3
2
Setpoint 2
1
Setpoint 1
0
Normal
setpoint
See section 35. Factory settings.

17.22 "Temperature influence"

Pump variant
TPE3,TPE3 D
TPE2,TPE2 D
When the 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 +176 °F or +122 °F (80 °C or 50 °C).
These temperature limits are called T
reduced in relation to the head set which is equal to 100 %
according to the characteristics below.
H
100 %
H
actual
H
actual
30 %
20 50
T
T
actual
actual
Fig. 66 "Temperature influence"
In the above example, T ,which is equal to +176 °F (+80 °C),
max.
has been selected.
The actual liquid temperature, T
head to be reduced from 100 % to H
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 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.
Selecting the maximum temperature
In systems with a dimensioned flow-pipe temperature of:
• up to and including +131 °F (+55 °C), select T
°C,
• above +131 °F (+55 °C), select T
You cannot use the temperature influence function in
air-conditioning and cooling systems.
Factory setting
See section 35. Factory settings.

"Temperature influence"

●
-
. The setpoint is
max.
H
80
T [°C] Q
176 T [°F]
, causes the setpoint for
actual
.
actual
equal to 50
max.
equal to +176 °F (80 °C).
max.
47