Grundfos CME User Manual

English (GB)
47
"Diaphragm tank volume"
The stop function requires a diaphragm tank of a
certain minimum size. Set the size of the installed
tank in this display.
In order to reduce the number of start-stops per hour
or to reduce the ∆H, install a larger tank.
Install the tank immediately after the pump. The
precharge pressure must be 0.7 x actual setpoint.
Recommended diaphragm tank size:
Factory setting
See section 24. Factory settings.
13.19 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 fig. 55.
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.
Fig. 55 Filling and pressure build-up phases
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.
Factory setting
See section 24. Factory settings.
Rated flow rate of
pump
[m
3
/h]
Typical diaphragm tank
size
[litres]
0-6 8
7-24 18
25-40 50
41-70 120
71-100 180
Pump variant Pipe filling function
CME ●
CRE, CRIE, CRNE,
SPKE, MTRE
●
TM03 9037 3207
When you activate this function, the
function always starts when the pump has
been in operating mode "Stop" and is
changed to "Normal".
1. Filling phase
(constant-curve
operation)
2. Pressure build-up
phase
(constant-pressure
operation)
Pressure
Filling time Pressure
build-up
time
Time
[sec]
Filling pressure
Maximum filling time
Setpoint
Setpoint
ramp-up
Actual value

Grundfos CME Specifications

General

Liquid temperature range	0 °C to +60 °C
Maximum operating pressure	10 bar
Series	CME
Frequency	50/60 Hz
Max Pressure	10 bar
Pump Type	Centrifugal
Material	Stainless steel
Applications	pressure boosting, irrigation
Pumped liquid	Clean water
Approvals	CE
Max Liquid Temperature	60°C
Power Supply	1-phase or 3-phase