Grundfos CUE
39
CUE selection
How to select a CUE
The size of the CUE is determined quickly and precisely
based on the max. motor current. See fig. 48.
The power size, which is the typical shaft power P2, is
only an appr
oximate value and cannot be used to select
the nominal size of the CUE.
Fig. 48 Selection of CUE based on max. motor current
The main steps
When you have selected the pump, follow these steps
to select a CUE:
1. Select the voltage range of the CUE. It should fit the
mot
or voltage and the mains supply at the installa-
tion site.
2. Find the max. motor current*on the motor name-
plate or in the data sheet of the selected motor. Se-
lect the first CUE that is able to deliver the max.
motor current. See selection tables starting on page
41.
3. Select the enclosure class. Choose IP21 or IP54/55.
See selection tables starting on page 41.
4. Check if an output filter is required. Select the out-
put filter according to the table on page 34.
5. Select the accessories required for the application.
It could be sensors or additional input modules.
Selecting the different accessories may require addi-
tional steps.
* Important note: If motor has service factor, use
ser
vice factor amperes for max. motor current.
The actual motor current should always be less than or
equal to the
output current of the CUE.
If not, the CUE will reduce the maximum speed when
the
maximum limit is reached during operation.
Example 1
These data are given:
• voltage range is 3 x 460 V
• max. motor current is 23.6 A.
• enclosure class of the CUE must be IP21.
Select the CUE according to the selection tables in sec-
tion Mains supply 3 x 440 - 500V on 43.
Data of the CUE selected:
TM04 0375 0608
Hungary
Made in
50 Hz
3 ~MOT MG 160 MB
Eff. % 90
n 2920-2930 min
-1
CL F
IP 55
DE NDE
P 11,0 kW No
2
U 380-415 D V
I 21,4 A
I 23,6 A
cos 0.89-0.87
1/1
max
96075740
Max. motor
current
CUE
Max. output
current
Motor nameplatePump
Max. output current: 27A
Product number (IP21): 91136772
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