Operating Range - Grundfos CRE Montage- Und Betriebsanleitung

9.3.9 Flow limit for the stop function (only three-phase
pumps)
Flow limit for the stop function only works if the
Note
system is not set up for flow switch.
In order to set at which flow rate the system is to go from
continuous operation at constant pressure to start/stop operation,
select among these four values of which three are preconfigured
flow limits:
• Low
• Normal
• High
• Custom.
The default setting of the pump is Normal, representing approx.
10 % of the rated flow rate of the pump.
If a lower flow limit than Normal is desired or the tank size is
smaller than recommended, select Low.
If a higher flow than Normal is wanted or a large tank is used, set
the limit to High.
The value Custom can be seen in R100 but it can only be set by
means of the PC Tool E-products. Custom is for customised set-
up and optimising to the process.
ΔH
Low
Normal
Fig. 27 Three preconfigured flow limits, Low, Normal and High
9.3.10 Sensor
Without sensor
(uncontrolled)
The setting of the sensor is only relevant in the case of controlled
operation.
Select among the following values:
• Sensor output signal
0-10 V
0-20 mA
4-20 mA,
• Unit of measurement of sensor:
bar, mbar, m, kPa, psi, ft, m
• Sensor measuring range.
22
High
With pressure sensor
(controlled)
3 3
/h, m /s, l/s, gpm, °C, °F, %
9.3.11 Duty/standby (only three-phase pumps)
The duty/standby function applies to two pumps connected in
parallel and controlled via GENIbus.
The duty/standby function can be set to these values:
• Active
• Not active.
When the function is set to Active, the following applies:
• Only one pump is running at a time.
• The stopped pump (standby) will automatically be cut in if the
running pump (duty) has a fault. A fault will be indicated.
• Changeover between the duty pump and the standby pump
will take place every 24 hours.
Activate the duty/standby function as follows:
1. Connect one of the pumps to the mains supply.
Set the duty/standby function to Not active.
Using the R100, make the necessary settings in menu
OPERATION and INSTALLATION.
2. Set the operating mode to Stop in menu OPERATION.
3. Connect the other pump to the mains supply.
Using the R100, make the necessary settings in menu
OPERATION and INSTALLATION.
Set the duty/standby function to Active.
The running pump will search for the other pump and
automatically set the duty/standby function of this pump to Active.
If it cannot find the other pump, a fault will be indicated.

9.3.12 Operating range

How to set the operating range:
• Set the min. curve within the range from max. curve to 12 % of
maximum performance. The pump is factory-set to 24 % of
maximum performance.
• Set the max. curve within the range from maximum
performance (100 %) to min. curve.
The area between the min. and max. curves is the operating
range.
H
100 %
Max. curve
Min. curve
12 %
Fig. 28 Setting of the min. and max. curves in % of maximum
performance
Q