Pipe Filling Function; Pulse Flowmeter" ("Pulse Flowmeter Setup"); Ramps - Grundfos CRE Installation And Operating Instructions Manual

8.18 "Pipe filling function"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
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.
A
B
D
E
G
H
K
Filling and pressure build-up phases
Pos. Description
A Pressure
B Filling phase (constant-curve operation)
C Pressure build-up phase (constant-pressure operation)
D "Setpoint"
E Filling pressure
F Setpoint ramp-up
G Actual value
H Filling time
I Pressure build-up time
J Time [sec]
K Maximum filling time
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.
"Pipe filling function"
●
●
C
F
J
I
• "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
9.2 Factory settings

8.19 "Pulse flowmeter" ("Pulse flowmeter setup")

Pump variant
CME
CRE, CRIE, CRNE,
CRKE, SPKE, MTRE
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. See the
section on digital inputs.
Factory setting
See the section on factory settings.
Related information
8.7 "Digital inputs"
9.2 Factory settings

8.20 "Ramps"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
The ramps determine how quickly the pump can accelerate and
decelerate during start-stop or setpoint changes.
You can set the following:
• acceleration time, 0.1 to 300 seconds
• deceleration time, 0.1 to 300 seconds.
The times apply to the acceleration from 0 rpm to maximum (fixed)
speed and the deceleration from maximum (fixed) speed to 0 rpm,
respectively.
At short deceleration times, the deceleration of the pump may
depend on load and inertia as there is no possibility of actively
braking the pump.
If the power supply is switched off, the deceleration of the pump
only depends on load and inertia.
"Pulse flowmeter"
("Pulse flowmeter setup")
●
●
"Ramps"
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