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.
10.19 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 176 °F or 122 °F (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 176 °F (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 reduction of the pump performance in
periods with small heating demands and consequently a
reduced flow-pipe temperature.
• Systems with almost constant flow rates, 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
max.
equal to 122 °F (50 °C).
In systems with a dimensioned flow-pipe temperature of above
131 °F (55 °C), select T
max.
equal to 176 °F (80 °C).
You cannot use the temperature influence function in air-
conditioning and cooling systems.
Factory setting
See the section on factory settings.
Related information
10.57 Factory settings for Grundfos GO
10.20 Limit-exceeded function
Use this function to monitor a measured parameter or one of the
internal values such as speed, motor load or motor current. If a set
limit is reached, a selected action can take place. You can set two
limit-exceeded functions, meaning that you can monitor two
parameters or two limits of the same parameter simultaneously.
The function requires setting of the following parameters:
Measured
Set the measured parameter to be monitored.
Limit
Set the limit which activates the function.
Hysteresis band
Set the hysteresis band for when the function must be deactivated
again.
Limit exceeded when
Set the function to be activated when the selected parameter
exceeds or drops below the set limit.
• above limit
The function is activated if the measured parameter exceeds the
set limit.
• below limit
The function is activated if the measured parameter drops below
the set limit.
Action
If the value exceeds a limit, you can set an action. The following
actions are available:
• Not active
The pump remains in its current state. Use this setting if you
only want to activate a signal relay output when the limit is
reached.
• Stop
The pump stops.
• Min.
The pump reduces the speed to minimum speed.
• Max.
The pump increases the speed to maximum speed.
• User-defined speed
The pump runs at a speed set by the user.
• Alarm and Stop
An alarm is given, and the pump stops.
• Alarm and Min
An alarm is given, and the pump decreases the speed to a
minimum.
• Alarm and Max
An alarm is given, and the pump increases the speed to
maximum.
• Alarm and User-defined speed
An alarm is given, and the pump runs at the speed set by the
user.
Detection delay
Setting the detection delay ensures that the monitored parameter
stays above or below a set limit in a set time before the function is
activated.
Resetting delay
The resetting delay is the time from when the measured parameter
differs from the set limit, including the set hysteresis band, and until
the function is reset.
48
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