Submersible Pump Application Essay Sample free essay sample

The system consists of a submergible pump controlled by a Danfoss VLT AQUA Drive and a force per unit area sender. The sender gives a 4-20 ma feedback signal to the VLT AQUA Drive. which keeps a changeless force per unit area by commanding the velocity of the pump. To plan a thrust for a submergible pump application. there are a few of import issues to take into consideration. Therefore the thrust used must be chosen harmonizing to motor current. 1. The motor is a so called â€Å"Can motor† with a unstained steel can between the rotor and stator. There is a larger and a more magnetic resistant air-gap than on a normal motor hence a weaker field which consequences in the motors being designed with a higher rated current than a norm motor with similar rated power. 2. The pump contains thrust bearings which will be damaged when running below lower limit velocity which usually will be 30 Hz. We will write a custom essay sample on Submersible Pump Application Essay Sample or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page 3. The motor reactance is nonlinear in submergible pump motors and hence Automatic Motor Adaption ( AMA ) may non be possible. However. usually submergible pumps are operated with really long motor overseas telegrams that might extinguish the nonlinear motor reactance and enable the thrust to execute AMA. If AMA fails. the motor informations can be set from parametric quantity group 1-3* ( see motor datasheet ) . Be cognizant that if AMA has succeeded the thrust will counterbalance for electromotive force bead in the long motor overseas telegrams. so if the Advanced motor informations are set manually. the length of the motor overseas telegram must be taken into considerations to optimise system public presentation. 4. It is of import that the system is operated with a lower limit of wear and tear of the pump and motor. A Danfoss Sine-Wave filter can take down the motor insularity emphasis and addition life-time ( look into existent motor insularity and VLT AQUA Drive du/dt specific ation ) . It is recommended to utilize a filter to cut down the demand for service. 5. EMC public presentation can be hard to accomplish due to the fact that the particular pump overseas telegram which is able to defy the wet conditions in the well usually is unscreened. A solution could be to utilize a screened overseas telegram above the well and repair the screen to the well pipe if it is made of steel ( can besides be made of plastic ) . A Sine-Wave filter will besides cut down the EMI from unscreened motor overseas telegrams. The particular â€Å"can motor† is used due to the wet installing conditions. The thrust needs to be designed for the system harmonizing to end product current to be able to run the motor at nominal power. To forestall harm to the thrust bearings of the pump. it is of import to rage the pump from halt to min. velocity every bit speedy as possible. Well-known makers of submergible pumps recommend that the pump is ramped to min. velocity ( 30 Hz ) in soap. 2 -3 seconds. The new VLT © AQUA Drive is designed with Initial and Final Ramp for these applications. The Initial and Final inclines are 2 single inclines. where Initial Ramp. if enabled. will rage the motor from halt to min. velocity and automatically exchange to normal incline. when min. velocity is reached. Final incline will make the antonym from min. velocity to halt in a stop state of affairs. Pipe-Fill manner can be enabled to forestall H2O hammering. The Danfoss VLT AQUA Drive is capable of make fulling perpendicular pipes utilizing the PID accountant to easy rage up the force per unit area with a user specified rate ( units/sec ) . If enabled the thrust will. when it reaches min. velocity after startup. enter pipe fill manner. The force per unit area will easy be ramped up until it reaches a user specified Filled Set Point. where after the thrust automatically disables Pipe Fill Mode and continues in normal closed cringle operation. This characteristic is designed for irrigation applications.