10.4 Pipe-filling function
The function is typically used in pressure-boosting applications and
ensures a smooth startup of systems with for instance empty pipes.
Startup takes place in two phases:
• Filling phase (1): The pipes are slowly filled with water. When
the pressure sensor of the system detects that the pipes have
been filled, Phase 2 begins.
• Pressure build-up phase (2): The system pressure is
increased until the setpoint (SP) is reached. The pressure
buildup takes place over a ramp time. If SP is not reached within
a given time, a warning or an alarm can be given, and the
pumps can be stopped at the same time.
TM078698
Filling and pressure build-up phases
P: Pressure T: Time [second]
P
f
: Filling pressure T
f
: Filling time
Pos. Description
1 Filling phase: constant-curve operation
2
Pressure build-up phase: constant-pressure
operation
A Actual value
B Setpoint ramp-up
Setting range
• Filling speed. Fixed speed of the pump during the filling phase.
• Filling pressure. The pressure that the pump must reach
before the maximum filling time.
• Max. filling time. The time in which the pump must reach the
filling pressure.
• Max. time reaction. Reaction of the pump if the maximum filling
time is exceeded:
- warning
- alarm (pump stops).
• Pressure build-up time. Ramp time from when the filling
pressure is reached until the setpoint must be reached.
When you activate this function, the function always starts
when the pump has been in operating mode Stop and is
changed to Normal.
Factory settings
See section Factory settings.
Related information
21.6 Factory settings
10.5
Stop function
You can set the 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 the 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 the 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/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.
• 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.
• User-defined mode (Customised operating mode): The
pump uses the parameters set for ΔH and minimum flow (Q
min3)
respectively for the stop function.
TM064267
Difference between start and stop pressures (ΔH) and minimum
flow rate
22
English (GB)
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