The pump can control the level in a tank in two ways (see the figure
above):
• As an emptying function where the pump draws the liquid from
the tank.
• As a filling function where the pump pumps the liquid into the
tank.
The type of level control function depends on the setting of the built-
in controller.
Example:
• One external level sensor with emptying function.
TM057896
• One external level sensor with filling function.
TM057965
Controller settings
For recommended controller settings, see the section on the
controller.
Related information
10.15 Controller (Controller settings)
10.5.8
Constant other value
Use this control mode to control a value which is not available in the
Control mode menu. To measure the controlled value, connect a
sensor to one of the analog inputs. The controlled value is shown in
percentage of the sensor range.
10.5.9
Constant curve
Use this control mode to control the motor speed.
You can set the desired speed in percentage of the maximum
speed in the range from user-set minimum speed to user-set
maximum speed.
TM057957
10.6 Setting the proportional pressure
10.6.1 Control curve function
You can set the proportional curve either to quadratic or linear to
match the system curve.
10.6.2
Zero flow head
You can set this value in percentage of the setpoint and define how
much the setpoint must be reduced at a closed valve. With a setting
of 100 %, the control mode is equal to the constant differential
pressure.
10.6.3
Fixed inlet pressure
This menu enables the use of a fixed inlet pressure.
10.6.4
Inlet pressure
Enter the fixed inlet pressure that is to be supplied to the pump.
10.6.5 Pump data
To enable the pump to operate in proportional pressure, the
controller needs to process the pump curve. Enter the maximum
head, rated head and rated flow rate from the pump nameplate.
10.7 FLOWLIMIT
FLOWLIMIT
• Enable the FLOWLIMIT function.
• Set the FLOWLIMIT.
H
Q
Q
max
Q
max
Q
limit
25 %
90 %
1
TM057908
FLOWLIMIT
Pos. Description
1 Setting range
You can combine the FLOWLIMIT function with the following control
modes:
• Prop. pressure
• Con. diff. press.
• Con. diff. temp.
• Const. temp.
• Const. curve.
A flow-limiting function ensures that the flow never exceeds the
entered FLOWLIMIT value.
The setting range for FLOWLIMIT is 25 to 90 % of the Q
max
of the
pump.
The factory setting of FLOWLIMIT is the flow rate where the
AUTOADAPT factory setting meets the maximum curve. See the
figure above.
Factory setting
See the section on factory settings.
Related information
10.57 Factory settings for Grundfos GO
10.8
Automatic Night Setback
Once you have enabled automatic night setback, the pump
automatically changes between normal duty and night setback, duty
at low performance.
Changeover between normal duty and night setback depends on
the flow-pipe temperature.
The pump automatically changes over to night setback when the
built-in sensor registers a flow-pipe temperature drop of more than
50 to 59 °F (10 to 15 °C) within approximately two hours. The
temperature drop must be at least 0.18 °F/min (0.1 °C/min).
Changeover to normal duty takes place without a time lag when the
temperature has increased by approximately 50 °F (10 °C).
You cannot enable automatic night setback when the pump is in
constant-curve mode.
39
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