SQN SQN pumps feature an innovative motor design incorporating permanent-magnet technology. By combining permanentmagnet motors and a Grundfos micro-frequency converter, we are able to deliver unmatched performance coupled with unique pump protection. SQN pump models operate at a constant speed much like today’s conventional pumps. The difference is that SQ delivers the benefits of an electronically controlled permanentmagnet motor that cannot be achieved with a conventional induction motor. Features Constant pressure operation Using a CU 300/301 controller with the SQN your water pressure will always remain constant regardless of how many family members are consuming water. As more taps are opened, the pump automatically increases its speed, maintaining your chosen pressure at any flow rate. Excellent starting capabilities The soft starter minimises the risk of wear on the pump and prevents overloading of the mains during start-up. Its softstart system also reduces water hammering, light flickering and other electrical disturbances. Overvoltage and undervoltage protection The integrated protection prevents damage to the motor in case the supply voltage moves outside the permissible voltage range. Overload protection If the pump is exposed to heavy load the motor will automatically reduce its speed, or if the pump is blocked it automatically stops pumping. This eliminates the need for motor protection Over-heating protection As an extra protection, the electronic unit has a builtin temperature sensor. When the temperature exceeds a critical limit, the pump is stopped and when the temperature has dropped, the pump automatically starts. Protection against upthrust The pumps are fitted with an upthrust bearing protecting both pump and motor against upthrust, thus preventing breakdown during the critical start-up phase. Generator friendly Minimum generator size is 10% higher than the input power required for the pump. Applications SQN • Groundwater supply • Small irrigation systems • Pressure boosting • Liquid transfer in tanks Operating Conditions pH values 5 to 8 Liquid temperature 0°C to 35°C Technical Data Mains voltage 1 x 240 V, 50 Hz Enclosure class IP68 Insulation class F Installation depth Max. 150 m below static water level Pump diameter 74 mm Borehole diameter Min. 76 mm Approvals and markings CE, UL, cUL PUMP & MOTOR 2 Submersible Pumps Range
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