Environmental pumps SQE-NE General data Operating conditions Flow: 0.3–7.5 m3/h Head: max. 153 m (For more details see page 2.4-12) Pumped liquids The SQE-NE pump is suitable for use with slightly aggressive liquids such as contaminated groundwater and groundwater containing hydrogen carbonate. SQE-NE pumps can pump liquids with a sand content of up to 50 g/ m3. A higher content of sand will reduce the pump life. Applications SQE-NE pumps are suitable for the following applications: ■■ sampling ■■ remedial pumping ■■ withdrawal of contaminated water at – dumps – chemical depots – industrial sites – garages and filling stations ■■ pumping in water treatment systems ■■ pumping of industrial process water ■■ water quality monitoring. SQE-NE pumps are built for both continuous and intermittent operation. Note: For other applications, please contact Grundfos. Type key Example SQ E 2 -50 NE Pump range E = Electronic control and communication Rated flow [m3/h] Head at rated flow [m] Material code: N = stainless steel DIN 1.4401/AISI 316 E = Environmental (The pump is suitable for pumping of polluted liquids) Pump High pump efficiency The hydraulic pump components are PVDF CN-F‚reinforced with 10 % carbon fibre. The hydraulic design gives high pump efficiency meaning low energy consumption and therefore low energy costs. Wear resistance The SQE-NE pump design features impellers which are not fastened to the shaft (“floating”). Each impeller has its own tungstencarbide/ceramic bearing. The design and materials chosen ensure high wear resistance to sand for long product life. Protection against upthrust Starting up a pump with a very low counter-pressure involves the risk of the entire impeller stack being lifted – also called upthrust. Upthrust may cause breakdown of both pump and motor. The MSE 3-NE is fitted with a top bearing protecting both pump and motor against upthrust and thus preventing breakdown during the critical start-up phase. Motor The submersible SQE-NE pump is fitted with a singlephase GrundfosMSE 3-NE motor, which is available in three sizes with a maximum power P2 of 1.7 kW. Excellent starting capabilities The integrated electronic unit of the MSE 3-NE motors features soft starting. Soft start reduces the starting current and thus gives the pump a smooth and steady acceleration. The soft starter minimises the risk of pump wear and prevents overloading of the mains during start-up. The excellent starting capabilities are a result of the high lockedrotor torque of the permanent-magnet motor together with the few pump stages. The high tarting reliability also applies in case of low voltage supply. Overvoltage and undervoltage protection Overvoltage and undervoltage may occur in case of unstable voltage supply. The integrated protection of the MSE 3-NE motors protects the motor in case the voltage falls outside the permissible voltage range. The pump will be cut out if the voltage falls below 150 V or rises above 280 V. The motor is automatically cut in again when the voltage is again within the permissible voltage range. Therefore, no extra protection relay is needed. Overload protection Exposure of the pump to heavy load causes the current consumption to rise. The motor will automatically compensate for this by reducing the speed to 3000 rpm. Further overload will lead to stop. The same applies if the rotor is being prevented from rotating. This will automatically be detected and the power supply cut out. Consequently, no extra motor protection is required. Overtemperature protection A permanent-magnet motor gives off very little heat to its surroundings. In combination with an efficient internal circulation system providing cooling of the rotor, stator and bearings, this ensures optimum operating conditions for the motor. As extra protection, the electronic unit has a built-in temperature sensor. When the temperature rises too high, the motor is cut out. When the temperature has dropped, the motor is automatically cut in again. Variable speed The SQE-NE pump features variable speed which is offered through frequency control. Consequently the pump can be set to operate in any duty point in the range between the min. and max. pump performance curves. The SQE-NE pump features communication with the Grundfos CU 300 control unit, which can be operated with the Grundfos R100 remote control. The SQE-NE pump can also operate without the CU 300. (see pages 2.4-14 – 2.4-19). For the calculation of pump speed, the PC tool “SQE speed calculation” is available on CD-ROM as an accessory. Pump and motor range Product SQE-NE pump MSE 3-NE pump Description 2 and 5 m3/h Single-phase 0.1– 0.63 kW 0.7–1.05 kW 1.1–1.73 KW Pipe connection Pump type SQE 2-NE SQE 5-NE Material Stainless steel DIN 1.4401, AISI 316 Seals: FKM(viton) Stainless steel DIN 1.4401, AISI 316 Seals: FKM(viton) Threaded connection Rp 1¼ Rp 1½ Installation The SQE-NE pump is suitable for vertical and horizontal installation or any position inbetween. For horizontal installation a flow sleeve is recommended. An electric supply cable with plug is available on request (up to 80 m). 159
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