Grundfos CRFlex 3-11 Surface Pump

The Grundfos CR Flex is a high technology multi-stage centrifugal in-line non self priming surface pump specifically designed for water transfer, irrigation and pressure boosting in solar powered applications. It is fitted with the advanced MG Flex variable frequency driven motor that offers the following features:-

• Runs at varying speeds depending upon the energy input available.
• Can be used for DC or AC power supply and can therefore be connected to either PV solar modules, a standby AC generator or mains power supply as required.
• Utilises Maximum Power Point Tracking (MPPT) technology that continuously optimises speed according to input power.
• Built in protection for under and over voltage and system overload. No additional protection is therefore required.
• One set of terminals included for either high or low level control functions.
Three models are available, all powered by the same 1250W motor providing a selection of head and flow outputs depending on application. System sizing is easy using the Grundfos WinCAPS PC based sizing tool that optimises system design given the installation location, total head and water output required.

Materials of construction are stainless steel for the hydraulic parts and cast iron for the pump head and base.

The Grundfos CR Flex renewable energy pumping system is efficient, reliable and cost effective and is the ideal solution for all off-grid water pumping applications.

MOTOR
The pump is connected to an MG Flex 2 pole variable frequency drive (VFD) induction motor. The VFD controller is attached to the motor and can accommodate a wide voltage range. It also offers over and under voltage, overload and over temperature protection.

Power Input: 70 - 1250W                                 Max Current: 5A                       Voltage: 110 - 415VDC
1x220 - 240V AC 50/60Hz
Motor Speed: 1000 - 3400rpm                         Enclosure: 1P54                            Insulation Class: F

CONTROL UNITS
Options of the IO50 manual solar powered unit and the IO101 solar/generator flex unit are available. The IO101 controls supply to the pump from either source and automatically switches to solar power when the AC source is disconnected.

SOLAR MODULES
CRFlex should be powered by proprietary Photo Voltaic solar modules connected in arrays to provide the power required. Arrays should be connected in series to provide at least 110VDC to the motor

OPERATING CONDITIONS
Pumped Liquid: Thin, clear, non-aggressive liquids not containing fibres or particles with a sand content of less than 20ppm.
Liquid Temperature Range: 0⁰C-+40⁰C
Max Ambient Temperature: - +40⁰C
Max Input Pressure: - 25Bar