English (GB)
46
8.7.38 User-defined duty (4.3.14.3)
Fig. 84
User-defined duty
Description
You can set a user-defined performance, typically a performance
between min. and max. duty.
The function makes it possible to set a pump performance by
selecting the number of pumps to run and the speed of variable-
speed pumps.
This function primarily selects the variable-speed pumps. If the
number of selected pumps exceeds the number of variable-speed
pumps, mains-operated pumps are started too.
Setting range
• Number of pumps in operation.
• Speed as percentage for variable-speed pumps.
Note:
In systems with only variable-speed pumps, the speed
can be set between 25 and 100 %; in systems with both
variable-speed pumps and mains-operated pumps the speed
can be set between 70 and 100 %.
Setting via control panel
• Settings > Secondary functions > Stop function > Min., max.
and user-defined duty > User-defined duty.
Select and set:
• Number of pumps in operation, user-defined duty.
• Speed.
Factory setting
The function is disabled as the following has been set:
8.7.39 Pump curve data (4.3.19)
Fig. 85
Pump curve data
Description
The CU 352 has a number of functions using these pump data:
The data are read by means of the pump performance curves
which can be found in WebCAPS on Grundfos’ homepage,
www.grundfos.com. See the examples in fig.
.
If WebCAPS is not accessible, try to bring a pump into the three
duty points:
• Power, Q0, 100 % speed
• Power, Q0, 50 % speed
• Rated power Pnom.
Read the power values in displays 1.3 to 1.8, depending on the
pump. See section
8.4.10 Pump 1 - 6, Pilot pump, Backup pump
Fig. 86
Reading of Qnom, Hnom, Hmax and Qmax
(WebCAPS)
Number of pumps in operation during user-defined duty:
0
• Rated flow rate Qnom
[m
3
/h]
• Rated head Hnom
[m]
• Max. head Hmax
[m]
• Max. flow rate Qmax
[m
3
/h]
• Power, Q0, 100 % speed
[kW]
• Power, Q0, 50 % speed
[kW]
• Rated power Pnom
[kW]
Note
Grundfos can supply hydraulic data for CR, CRI,
CRE and CRIE pumps where GSC files can be
downloaded to the CU 352.
All other pump types require manual entering of
hydraulic pump data.
Note
The electrical data, "Power, Q0, 100 % speed" and
"Power, Q0, 50 % speed" must be entered manually
for all pump types, including CR, CRI, CRE and
CRIE.
For Grundfos E-pumps, the data of input power (P1)
must be entered.
TM
03
99
93
48
07
Rated duty point
Hnom
Qnom
Qmax
Hmax
