This function monitors the speed of the pump. When the PI-
controller has forced the speed of the pump to minimum according
to the feedback value, the pump stops after a set period of time.
It remains stopped until the feedback value starts to drop and the
PI-controller starts the pump again.
• Enable Stop at min. speed
Enables the function Stop at min. speed.
• Delay
The delay time the pump must be running at minimum speed
before it stops.
• Restart speed
Speed in percentage when the pump must start again,
hysteresis. It must be set higher than the minimum speed of the
pump.
10.24 Pipe filling function
This 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. See the figure below.
1. Filling phase. The pipes are slowly filled with water. When the
pressure sensor of the system detects that the pipes have been
filled, phase two begins.
2. Pressure build-up phase. The system pressure is increased until
the setpoint is reached. The pressure build-up takes place over
a pressure build-up time. If the setpoint 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.
TM039037
Filling and pressure build-up phases
Pos. Description
1 Filling phase (constant-curve operation)
2 Pressure build-up phase (constant-pressure operation)
3 Setpoint
4 Filling pressure
5 Actual value
6 Setpoint ramp-up
7 Filling time
8 Pressure build-up time
9 Maximum filling time
P Pressure
t(s) Time (sec)
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 setting
See the section on factory settings.
Related information
10.57 Factory settings for Grundfos GO
10.25 Pulse flowmeter (Pulse flowmeter setup)
You can connect an external pulse flowmeter to one of the digital
inputs in order to register the actual and accumulated flows. Based
on this, you can also calculate the specific energy.
To enable a pulse flowmeter, set one of the digital-input functions to
Accumulated flow and set the pumped volume per pulse.
Factory setting
See the section on factory settings.
Related information
10.11 Digital inputs
10.57 Factory settings for Grundfos GO
10.26 Ramps
The ramps determine how quickly the product can accelerate and
decelerate during start and stop or setpoint changes.
You can make the following settings:
• acceleration time, 0.1 to 300 s
• deceleration time, 0.1 to 300 s.
The times apply to the acceleration from 0 rpm to a fixed maximum
speed and the deceleration from a fixed maximum speed to 0 rpm,
respectively.
At short deceleration times, the deceleration of the product may
depend on load and inertia as there is no possibility of actively
braking the product.
If the power supply is switched off, the deceleration of the product
only depends on the load and inertia.
TM069798
51
English (US)
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