Example
The function is to monitor the outlet pressure from the pump. If the
pressure is below 72 psi (5 bar) for more than 5 seconds, a warning
is indicated. If the pressure is above 101 psi (7 bar) for more than 8
seconds, reset the limit-exceeded warning.
TM070085
X: Time in seconds
Y: Pressure in psi (bar)
Pos. Parameter Setting
1 Measured Discharge pressure
2 Limit 72 psi (5 bar)
3 Hysteresis band 29 psi (2 bar)
4 Limit exceeded when below limit
5 Detection delay 5 seconds
6 Resetting delay 8 seconds
A Limit-exceeded function active -
- Action Warning
10.21 LiqTec (LiqTec function)
Wiring example:
TM083190
LiqTec
LT1 White wire
Brown and black wires
LT2 Blue wire
You can enable the function of the LiqTec sensors in the display. A
LiqTec sensor protects the pump against dry running.
The function requires that a LiqTec sensor has been fitted and
connected to the pump.
When you have enabled the LiqTec function, it stops the pump if dry
running occurs. Restart the pump manually if it has been stopped
due to dry running.
Dry-running detection delay
You can set a detection delay to make sure that the pump is given a
chance to start up before the LiqTec function stops the pump due to
dry running.
Range: 0-254 seconds.
Factory setting
See the section on factory settings.
Related information
10.57 Factory settings for Grundfos GO
10.22 Stop function (Low-flow stop function)
You can set Low-flow stop function to these values:
• Not active
• Energy-optimal mode
• High-comfort mode
• User-defined mode (Customised operating mode).
When the low-flow stop function is active, the flow is monitored. If
the flow becomes lower than the set minimum flow (Q
min
), the pump
changes from continuous operation at constant pressure to start-
stop operation and stops if the flow reaches zero.
The advantages of enabling Low-flow stop function are the
following:
• no unnecessary heating of the pumped liquid
• reduced wear of the shaft seals
• reduced noise from operation.
The disadvantages of enabling Low-flow stop function may be the
following:
• The delivered pressure is not completely constant as it
fluctuates between the start and stop pressures.
• The frequent starts and stops of the pump may in some
applications cause acoustic noise.
The impact of the above disadvantages very much depends on the
setting selected for the stop function.
The High-comfort mode setting minimises pressure fluctuations
and acoustic noise.
Select Energy-optimal mode if the main priority is to reduce the
energy consumption as much as possible.
Possible settings of the stop function:
• Energy-optimal mode The pump automatically adjusts the
parameters for the stop function so that the energy consumption
during the start-stop operation period is minimised. In this case,
the stop function uses the factory-set values of the minimum
flow (Q
min1
) and other internal parameters. See the figure
below.
• High-comfort mode: The pump automatically adjusts the
parameters for the stop function so that the disturbances during
the start-stop operation period are minimised. In this case, the
stop function uses the factory-set values of the minimum flow
(Q
min2
) and other internal parameters. See the figure below.
• User-defined mode (Customised operating mode): The
pump uses the parameters set for ΔH and minimum flow (Q
min3)
respectively for the stop function. See the figure below.
Q
Q min2
Q min1
Q min3
H
△ H
1
2
TM064267
Difference between start and stop pressures (ΔH) and minimum
flow rate
Pos. Description
1 Stop pressure
2 Start pressure
49
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