Product Manual
Table Of Contents
- 1. SQ, SQE introduction
- 2. SQ, SQE applications
- SQ with pressure switch and pressure tank
- Constant-pressure control with CU 301, residential water supply
- Constant-pressure control with CU 301, irrigation
- Maintaining a constant water table
- Emptying or filling a tank
- Pumping from one tank to another
- Setting of operating parameters
- SQE with manual speed control
- 3. Performance range
- 4. SQ, SQE installation
- 5. Sizing and selection
- 6. Cable sizing
- 7. SQ, SQE curve charts
- 8. SQ, SQE technical data
- 9. SQ, SQE construction
- 10. CU331SP variable frequency drive
- 11. Accessories
- 12. SP introduction
- 13. SP product overview
- 14. SP construction
- 15. SP operating conditions
- 16. How to read the curve charts
- 17. SP curve charts and technical data
- 4" and larger wells
- SP 5S (5 gpm)
- SP 7S (7 gpm)
- SP 10S (10 gpm)
- SP 16S (16 gpm)
- SP 25S (25 gpm)
- SP 35S (35 gpm)
- SP 45S (45 gpm)
- SP 62S (62 gpm)
- SP 77S (77 gpm)
- 6" and larger wells
- SP 85S (85 gpm)
- SP 150S (150 gpm)
- SP 230S (230 gpm)
- SP 300S (300 gpm)
- 8" and larger wells
- SP 385S (385 gpm)
- SP 475S (475 gpm)
- 10" and larger wells
- SP 625S (625 gpm)
- SP 800S (800 gpm)
- SP 1100S (1100 gpm)
- 18. SP electrical data
- 19. Accessories
- 20. Energy consumption
- 21. Cables
- 22. Friction loss tables
- 23. Grundfos Product Center
CU331SP variable frequency drive
SQ, SQE, CU 331, and SP
10
37
Identification
Nameplate
The CU331SP can be identified by means of the
nameplate. An example is shown below.
Fig. 22 Example of nameplate
CU331SP product range
CU331SP performance range
CU331SP sizing
Step 1
Calculate maximum head requirements at rated flow
conditions:
H
max
= dynamic head + system psi (in feet) + friction
loss + above grade elevation.
Step 2
Select pump from performance curves as follows:
Select a model in which the calculated value of H
max
is
within the maximum performance curve of the pump.
Refer to section CU331SP curve charts on page 51.
Step 3
Select the CU331SP that corresponds to the correct
motor Hp and enclosure type.
CU331SP operation
Menu structure
The CU331SP has a start-up guide, which is launched
at the first power up. After the start-up guide, the
CU331SP has a menu structure divided into four main
menus:
0. GENERAL gives access to the start-up guide for
the general setting of the CU331SP.
1. OPERATION enables the setting of setpoint and
resetting of alarms. It is also possible to see the
latest five warnings and alarms.
2. STATUS shows the status of the CU331SP and the
pump. It is not possible to change or set values.
3. INSTALLATION gives access to available
parameters.
TM05 6001 4012
Key
Text Description
T/C: CU-331 (product name)
Prod. no: Product number (98370280)
S/N:
Serial number (000201H462)
The last four digits indicate the production date. In
this case, 46 is the week, and 2 is the year 2012.
3.0 hp Typical shaft power on the motor
IN:
Supply voltage, frequency and maximum input
current.
OUT:
Motor voltage, frequency and maximum output
current. The maximum output frequency usually
depends on the pump type.
Type 12 / IP55 Enclosure class
Tamb. Maximum ambient temperature
Enclosure type NEMA Hp Input Ph Input volts
Indoor Type 12
2 1 200-240
3 1 200-240
5 1 200-240
Outdoor Type 4X
2 1 200-240
3 1 200-240
5 1 200-240
TM05 6380 5012
2 4 6 8 10 20 40 60 80 100
Q [US GPM]
40
50
60
80
100
150
200
300
400
500
600
800
1000
1500
2000
[ft]
H
SQE
2 Hp
2 Hp
3 Hp
5 Hp