Renewable-energy-based water supply systems
50/60 Hz

Applications

Being designed for continuous as well as intermittent operation, the SQFlex system is suitable for water supply applications in remote locations, such as:
• villages, schools, hospitals, single-family houses
• farms (livestock watering, irrigation)
• game reserves(watering applications)
• conservation areas (pumping of surface water)
• floating pump installations for water pumping from ponds and lakes.

SQFlex system

The SQFlex system is a reliable water supply system based on renewable energy sources, such as solar and wind energy. The SQFlex system incorporates an SQF submersible pump.
Very flexible as to its energy supply and performance, the SQFlex system can be combined and adapted to any need according to the conditions of the installation site.
The system components are:
• SQF submersible pump
• CU 202 SQFlex control unit
• IO 50 SQFlex switch box
• IO 101/IO 101 B SQFlex switch box
• charge controller
• energy supply system:
- solar panels
- wind turbine
- generator
- batteries.

Pump

The SQF pump range comprises two pump technologies:
• helical rotor pump (3") for high heads and small flow rates.
• centrifugal pump (3" and 4") for low heads and large flow rates.
The performance curves below illustrate the pump performance of the two pump models.
Q
H
A
B
TM022425
Performance ranges for helical rotor and centrifugal pumps
Pos. Description
A Helical rotor pump
B Centrifugal pump
Q /day
All pump types are available in two material variants:
• SQF is the standard version made of stainless steel DIN W.-Nr. 1.4301
• SQF-N is made of stainless steel DIN W.-Nr. 1.4401

Motor

The motor has been developed specifically for the SQFlex system and is designed according to the permanentmagnet principle with built-in electronic unit. The SQFlex 3" motor range comprises different motor sizes, the MSF 3 with 4 different maximum power input (P1) ratings of 300 W, 900W, 1400 W and 2500 W.
The motor speed range is 3000-10700 min-1 or 500-3600 min-1, depending on the motor size, power input and load.
The motor is available in two material variants:
• MSF 3 is the standard version made of stainless steel DIN W.-Nr. 1.4301
• MSF 3 N is made of stainless steel DIN W.-Nr. 1.4401.
The motor has three internal limitations:
• maximum power input (P1)
• maximum current of 8,4 A or 12 A
• maximum speed of 10700 min-1 or 3600 min-1.
The pump delivers its maximum performance when one of the above limitations is reached.
Supply voltage
Flexible regarding power supply and power range, the motor can be supplied with either DC or AC voltage:
• 30-300 VDC, PE (100-300 VDC for 2500 W motor)
• 1 × 90-240 VAC -10 % / +6 %, 50/60 Hz, PE.

Features and benefits

Dry-running protection
The SQF pump is protected against dry running to prevent damage to the pump. The dry-running protection is activated by a water level electrode placed on the motor cable 0.3 to 0.6 m (12 to 24 in) above the pump, depending on the pump type.
The water level electrode measures the contact resistance to the motor sleeve through the water. When the water level falls below the water level electrode, the pump stops. The pump automatically restarts five minutes after the water level is above the water level electrode.
0.3 to 0.6 m (12 to 24 in)
TM022436
Vertical installation
0.3 to 0.6 m (12 to 24 in)
TM078602
Horizontal installation

High efficiency
The MSF 3 motor is a permanent-magnet motor (PM motor) featuring a higher efficiency within the power range compared to a conventional asynchronous motor.
In addition, the segmented motor stator also contributes to high efficiency.
The MSF 3 motor is characterized by a high locked-rotor torque even at low power supply.

Over- and undervoltage protection
Over- and undervoltage may occur in case of unstable power supply or a defective installation. The pump stops if the voltage falls outside the permissible voltage range. The motor automatically restarts when the voltage returns within the permissible voltage range. No extra protection relay is needed.
Note: The MSF 3 motor is protected against transients from the power supply according to EN/IEC 61000-4-5 (6 kV). In areas with high lightning intensity, we use external lightning protection.

Overload protection
In case the upper load limit is exceeded, the motor automatically compensates by reducing the speed. If the speed falls below the minimum speed, the motor stops automatically.
The motor remains stopped for 30 seconds, then the pump automatically restarts.
The overload protection prevents the burnout of the motor.
No extra motor protection is required.

Technical data
Dimensions and weights
L
ø8
B
S
TM022209
Pump type
Dimensions [mm] Minimum borehole
[mm] 3)
Net weight
L B S [kg] *
SQF 0.6-2 (N) 1185 74 RP 1 1/4 76 7.6
SQF 0.6-3 (N) 1235 74 RP 1 1/4 76 7.9
SQF 1-30 (N) 990 74 RP 1 1/4 76 5.1
SQF 1-70 (N) 861 74 RP 1 1/4 76 5.1
SQF 1-155 (N) 1070 74 RP 1 1/4 76 9.7
SQF 1.2-2 (N) 1225 74 RP 1 1/4 76 7.9
SQF 1.2-3 (N) 1295 74 RP 1 1/4 76 8.2
SQF 2.5-2 (N) 1247 74 RP 1 1/4 76 8.2
SQF 3A-10 (N) 968/1012 101 RP 1 1/4 104 9.5/11.1
SQF 3-20 (N) 1070 74 RP 1 1/4 76 7.4/8.0
SQF 3-105 (N) 942 74 RP 1 1/4 76 6.5
SQF 5A-3 (N) 821/865 101 RP 1 1/2 104 8.1/9.3
SQF 5A-7 (N) 905/949 101 RP 1 1/2 104 8.8/10.2
SQF 5-70 (N) 941 74 RP 1 1/2 76 6.4
SQF 7-4 (N) 927 101 RP 1 1/2 104 11
SQF 7-55 (N) 860 74 RP 1 1/2 76 6.2
SQF 9-3 (N) 1011 101 RP 2 104 10.6
SQF 14-3 (N) 982 101 RP 2 104 11.2
3) Pump complete

Electrical data
Pump type Motor type
DC Voltage
[VDC]
AC Voltage
[VAC]
Speed
[RPM]
Maximum power
input
P1 [W]
Maximum current
[A]
SQF 0.6-2 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 0.6-3 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 1-30 (N) MSF 3 (N) 30-300 90-240 10700 300 8.4
SQF 1-70 (N) MSF 3 (N) 30-300 90-240 10700 1000 8.4
SQF 1-155 (N) MSF 3 (N) 100-300 90-240 10700 2500 12
SQF 1.2-2 (N) MSF 3 (N) 30-300 90-240 3600 1400 8,4
SQF 1.2-3 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 2.5-2 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 3A-10 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 3-20 (N) MSF 3 (N) 30-300 90-240 10700 300 8.4
SQF 3-105 (N) MSF 3 (N) 100-300 90-240 10700 2500 12
SQF 5A-3 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 5A-7 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 5-70 (N) MSF 3 (N) 100-300 90-240 10700 2500 12
SQF 7-4 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 7-55 (N) MSF 3 (N) 100-300 90-240 10700 2500 12
SQF 9-3 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4
SQF 14-3 (N) MSF 3 (N) 30-300 90-240 3600 1400 8.4