6 Features and benefits Dry-running protection 3”WPS® and 3”WPS®-CP pumps are protected against dry running. The 3”WPS®-CP controller is equipped with a flow sensor that at all times measures the pumped flow. As soon as this flow drops under a minimum value (Qmin is about 0,1m³/h), the pump will be stopped. Simultaneously, also the absorbed power of the motor is measured. A minimum value of this power ensures cut-out of the pump. Both these measurements ensure in case of lack of water in the borehole, a shutdown of the pump and thus preventing a burnout of the motor. The 3”WPS® motor includes a built-in controller that is factory-set with a cut-out power and which continuously tracks the absorbed power of the pump. In case of lack of water in the borehole, the absorbed power by the pump will be reduced below the Pcut-out. Consequently the pump will be stopped and thus prevent a burnout of the motor. The pump will automatically restart after 20 minutes which gives time to the well to recover. In case of a second dry run the pump will wait for 45 minutes before an automatic restart. At the 3rd dry run, the pump will wait for 6 hours and the fourth time for 24 hours. If a 5th dry run occurs, the pump goes in permanent error and has to be reset by taking off the supply from the motor. High pump efficiency and Wear resistance The WPS® pumps are entirely made of stainless steel and ensure a high efficiency meaning low energy consumption and therefore low energy costs. Due to its stainless steel construction in combination with the high performance NBR seals and bearings, the 3”WPS® and 3”WPS®-CP pumps ensure high wear resistance to sand for long product life. Excellent starting capabilities The integrated electronic unit of the 3”WPS® and 3”WPS®-CP controller features soft starting. A soft start reduces the starting current and gives the pump a smooth and steady acceleration. A soft starter minimizes the risk of wear of the pump and prevents overloading of the supply during start-up. The high starting 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 all three motor versions prevents damage to the motor in case the voltage moves outside the permissible voltage range. The 3”WPS®-CP pump will be cut out if voltage falls below 185V or rises above 260V and for the 3”WPS® models below 160V or over 260V. The motor will restart automatically when the voltage is reestablished 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. When the maximum allowed current is exceeded, the pump will be stopped. Also a locked rotor will automatically be detected and the power supply cut out. Consequently, no extra motor protection is needed. The 3”WPS® pumps have an extra feature that automatically reduce the speed of the pump when overload occurs. Lower speed means lower power and thus reduction of the absorbed amps. In the case the pump is running at 60Hz and still overloading, the pump will stop and automatically restart after one hour. General Data 3’’WPS®(-CP)
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