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.
Motor
The motor has been developed specifically for the SQFlex system and is designed according to the permanent- magnet 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 is flexible regarding power supply and power range, the motor can be supplied with either DC or AC voltage:
• 30-300 VDC, PE (100-300VDC for 2500W motor)
• 1 x 90-240 V - 10 %/+ 6 %, 50/60 Hz, PE.
Installation
The modular pump and motor design facilitates installation and service. The cable and the end cover with socket are fitted to the pump with screws to enable replacement.
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.
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.
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.
Pumped liquids
SQF pumps are applicable in thin, clean, non-aggressive and non-explosive liquids that do not contain solid or long- fibred particles.
pH value: 5-9.
Liquid temperature: 0-40 °C (32-104 °F).
The pump can run at free convection (~ 0 m/s, 0 ft/s) at maximum 40 °C (104 °F).
Maximum sand content: 50 g/m3 (50 ppm).
A higher sand content considerably reduces the lifespan of the pump.
SQFlex Solar with CU 200 and level switch
The SQFlex Solar system allows solar energy to be stored as water in a reservoir.
SQFlex Solar systems with a water reservoir are used, for instance, in the following cases:
• There is a need for water supply at night.
• For short periods, the solar energy is insufficient to run the pump.
• A backup water source is needed.
Benefits :
Combined with CU 200, the level switch has a pump cut- out function when te water reservoir is full.
CU 200 indicates the following:
• full water reservoir (level switch activated)
• pump operation
• input power.
CU 200 indicates operational downtime in the following cases:
• dry running
• service (see CU 200 SQFlex control unit)
• insufficient energy supply.
Other benefits:
• easy installation
• maintenance confined to periodic cleaning of the solar panels
• few and simple components.
Note: CU 200 works with SQFlex up to 1400 W. CIU 903 works with any SQFlex up to 2500 W.
SQFlex Solar with backup generator
During periods of limited solar energy, the SQFlex Solar system provides reliable water supply.
The system is connected to an external backup generator via the IO 101.
The system switches automatically to operation via generator when the generator is started.
If the generator is stopped manually or runs out of fuel, the IO 101 automatically changes back to operation via solar energy.
Benefits :
The system ensures water supply during the night or during periods of insufficient solar energy.
Other benefits:
• easy installation
• maintenance confined to periodic cleaning of the solar panels
• few and simple components
• flexibility.
The SQFlex system can be used in various combinations.
For the number of the required solar panels, see the sizing tool at Grundfos Product Center or contact-us.
During periods of limited solar energy, the SQFlex Solar system provides reliable water supply.
The water supply is ensured by backup batteries connected to the system through the charge controller.
The system is connected as shown in the fig. below.
• Power is provided by the solar panels wired to produce minimum 60 VDC and maximum 110 VDC.
• Power from the solar panels is fed into a 48 VDC charge controller, which regulates the current fed to the batteries.
• From the charge controller, power passes into the battery bank, which consists of the number of appropriately sized batteries wired in series to achieve 48 VDC (rated) output.
• Power is drawn from the battery bank and routed through a CU 200. Option: An IO 50 or IO 101 can be installed to enable disconnection of the DC voltage. If an IO 101 is installed, it is possible to add a generator to the system.
• Power is run from CU 200 to the SQFlex pump.
Benefits
The system ensures water supply during the night or during periods of insufficient solar energy.
Other benefits:
• easy installation
• maintenance confined to periodic cleaning of the solar panels
• few and simple components
• flexibility.
Note: CU 200 works with SQFlex up to 1400 W. CIU 903 works with any SQFlex up to 2500 W.
IO50
The IO 50 is designed specifically for solar-powered SQFlex systems. The IO 50 enables manual starting and stopping of the pump in an SQFlex Solar system, and functions as a connection box joining all necessary cables.
IO101
The IO 101 is designed for solar-powered SQFlex systems.
The IO 101 enables the connection of a backup generator in case of insufficient solar energy. The switching between solar power and generator must be made manually.
If the generator is stopped manually or runs out of fuel, the IO 101 automatically changes back to solar.
The IO 101 functions as a box that connects all necessary cables.
CU200
CU 200 is a combined status, control and communication unit designed for the SQFlex system. It can be connected to a level switch and is designed for SQFlex power range up to 1400 W and maximum 8.4 A.
CU 200 incorporates cable entries for the following connections:
• power supply (pos. 6)
• pump (pos. 7)
• earth (pos. 8)
• level switch (pos. 9).
The communication between CU 200 and the pump is ensured through the power supply cable. This is called mains-borne signaling (or power line
communication), which does not require extra cables between CU 200 and the pump.
Start, stop and reset the pump with the ON/OFF button (pos. 1).
CU 200 ensures system monitoring and alarm indication.
The operation can be monitored through the following indications:
• water reservoir full (level switch) (pos. 2)
• pump running (pos. 3)
• input power (pos. 11).
CU 200 indicates the following alarms:
• dry running (pos. 10)
• service needed (pos. 5):
• no contact to the pump - overvoltage
• overtemperature
• overload.
In addition, CU 200 shows the symbols of the energy supply options (pos. 4).
CIU 903 SQFlex control unit for remote monitoring
CIU 903 is a combined monitoring, control and communication unit designed to work directly with a SQFlex pump. When combined with a CIM 280 GRM module, it enables remote monitoring through Grundfos Go. Moreover, CIU 903 can be connected to a start/stop switch, a level switch or a pulsating water meter.
CIU 903 is designed to work with all SQFlex up to 2500W.
The communication between CIU 903 and the pump is ensured through the power supply cable. This is called mains-borne signaling (or power line communication), which does not require extra cables between CIU 903 and the pump.
Start, stop and reset the pump with the start/stop switch. CIU 903 ensures system monitoring and alarm indication.
The pump operation can be monitored through the following indications:
• water reservoir full (level switch)
• pump running.
CIU 903 indicates the following alarms:
• dry running
• service needed:
• no contact to the pump - overvoltage
• overtemperature
• overload.
Note: CIU 903 replaces CU 200 in the installation.