Frequently asked questions
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General
What is the SQ and SQE? An SQ is a 3¨ submersible pump bench-marked against the best 4¨ competitors and with a number of additional integrated protective features. Does the standard SQ model contain a frequency converter? Yes, the motor has a built-in frequency converter to give the pump high speed, resulting in high performance. What is the difference between SQ and SQE? The SQ is a single speed pump and the SQE is a variable speed pump which needs a control box to operate with variable speed and to monitor and adjust its features. What is the CU300 and CU301? The CU300 and CU301 are both control boxes to monitor and adjust the features on the SQE. The SQE together with the CU300 control box provides advanced features such as constant pressure, monitoring by modem, pump status read out, advanced pressure settings and more. The SQE together with the CU301 control box and a small tank and pressure sensor, all available in one package, provides an easy to install and operate adjustable constant pressure system. What is the R100? The R100 is a remote control needed to operate the CU300 control box. Can a SQE be installed without a CU300 or CU301 control box? Yes, but the pump will then operate as a normal SQ single speed pump. At any time, a CU300 or CU301 can be installed later in order to provide the customer with additional features. Top Product Data Which flow volumes will it handle? Nominal flows up to 7 m3/h and max. flows up to 9 m3/h. Top Applications Is SQ mainly for light domestic applications? SQ has been bench-marked against the best premium 4¨ pumps and motors and can be used for intermittent as well as continuous pumping without problems. There is even an AISI 316 version with special composite and rubber for demanding industrial and environmental applications. Can you guarantee that SQ can work in horizontal position? What about the heat created on the side touching the bottom of the tank or lake bed? If you pump clean water and the side of the pump does not touch anything, a cooling sleeve is not required. If the water contains solid particles, we recommend to use a cooling sleeve in horizontal installations. Top Installation Do I have to use an R100 with SQ, SQE and SQE-NE? No, not necessarily; SQE and SQE-NE could in principle function like an SQ, if you do not make special settings/changes by means of a CU 300 or R100. For SQ you cannot use R100. Top Protective features How do I protect SQ against dry-running? SQ pumps have built-in dry-running protection, without the use of a low level sensor. A preset power value ensures cut-out of the pump in case of lack of water in the well, thus preventing motor burnout. The software simply checks the power consumption. When it becomes too low, it stops the pump for 5 minutes. After this period, automatic restart is attempted. SQE will have the power cut-out value programmed by means of R100 during installation. The recommended values can be seen in the instruction manual. In case of changed performance curve, a new cut-out value must be calculated by means of the PC program ¨SQE - variable speed calculation¨. Top Service Can SQ be serviced? SQ pumps and motors are fully repairable. A range of spare parts are available. No special tools are required for the replacement. Is motor megging possible? No, the built-in overvoltage protection will short-circuit the megging voltage. Is it possible to check the motor resistance (ohm)? No, it is not possible, but the motor will not be damaged by the voltage from the ohmmeter. Are any special tools required to service SQ/SQE? If you want to be able to make full trouble-shooting of SQE, you need a CU 300 and an R100. Top Reliability Is SQ a plastic pump with a stainless steel outer casing? The complete motor is made of stainless steel. The pump has stainless sleeve and discharge. Inside it is made of polyamide with 30% glass reinforcement. Each impeller is equipped with tungsten carbide/ceramic bearings, which makes it extremely resistant against sand wear. Is anything special done to check the reliability of the electronic module after it leaves the production line? Reliability Stress Screening (RSS) is a process which is introduced at production startup in order to fulfil the market (customer) requirement for reliability in the field. See ¨Nordtest Method NE ELEC¨ and IEC 1163-1. Does SQ have soft start? Yes, it has an integrated soft starter reducing the starting current and thus giving the pump smooth and steady acceleration. Electronics create noise in the mains supply! SQ meets the EMC regulations concerning electrical noise back to the mains supply and radio noise to the surroundings. What is the lifetime of the permanent magnets? Won't they derate quickly? The lifetime of the motor is comparable with that of a conventional AC motor. The magnets have been tested to keep their power for minimum 10 years at 120°C, and this temperature is clearly above what they will be exposed to in the motor. Besides, the magnets are completely encapsulated in stainless steel. Top |
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