Using the VLT AQUA Drive in a submersible pump application

1. Using the VLT AQUA Drive in a submersible pump application Using the VLT AQUA Drive in a submersible pump application The system consists of a submersible pump controlled by a Danfoss VLT AQUA Drive and a pressure transmitter. The transmitter sends a 4-20mA feedback signal to the VLT AQUA Drive, which maintains constant pressure by controlling pump speed. When designing a drive for a submersible pump application, there are a few important issues to consider. Therefore, the inverter used should be chosen according to the motor current. 1 The motor is a "can motor" with a stainless-steel housing between the rotor and stator. There is a stronger and more magnetic air gap than on a normal motor, resulting in a weaker field, which results in motors being designed with a higher rated current than a standard motor of similarly rated power. 2 The pump contains thrust bearings which may be damaged when operating at a speed below the minimum speed, which normally will be 30 Hz.

2. 3 the motor reactance is nonlinear in engines of pumps immergéesPar consequently the automatic adaptation of the engine (AMA) may not be possible. However, normally submersible pumps operate with very long motor cables which could eliminate nonlinear motor reactance and allow the drive to perform AMA.

3. If the AMA fails, the motor data can be set from the parameter group 1-3 * (see motor datasheet). Be aware that if the AMA is successful, the drive will compensate for the voltage drop in the long motor cables. Thus, if the advanced motor data is set manually, the motor cable length should be considered to optimize system performance. 4 It is important that the system operates with minimal wear to the pump and motor. A Danfoss Sine-Wave filter can lower motor insertion stress and increase service life (check actual motor insulation and VLT AQUA Drive du / DT specification). It is recommended to use a filter to reduce the need for maintenance. 5 EMC performance can be difficult to achieve because the special pump cable, capable of withstanding wet conditions in the well, is normally unshielded. One solution could be to use a shielded cable over the well and attach the screen to the good pipe if it is steel (can also be plastic). A sine wave filter will also reduce electromagnetic interference generated by unshielded motor cables. The special “bobbin motor” is used due to the wet installation conditions. The inverter must be designed for the system according to the output current in order to be able to run the motor at rated power. To prevent damage to the pump thrust bearings, it is important to add pressure to the pump. speed as fast as possible. Well-known manufacturers of submersible pumps recommend that the pump is at a minimum. speed (30 Hz) at max. 2-3 seconds. The new VLT © AQUA drive is designed with the initial and final ramps for these applications. The initial and final ramps are 2 individual ramps, where Initial Ramp, if enabled, will cause the motor to stop at min. speed and automatically switch to the normal

4. ramp when min. speed is reached. The final ramp will do the opposite of min. the speed to stop in a stopping situation. The Pipe Fill mode can be activated to create mold water. The Danfoss VLT AQUA drive is capable of filling vertical pipes using the PID controller in order to gradually increase the pressure with a user-specified flow rate (units / s). If enabled, the reader will do so when it reaches min. speed after start-up, enter pipe filling mode. The pressure will slowly increase until it reaches a user-specified filled set point, after which the inverter automatically turns off the pipe fill mode and continues in normally closed-loop operation. This feature is designed for irrigation applications. Some of the advantages of using the VLT AQUA player: Reduces harmonic disturbances with integrated DC coils Correct operation with shielded EMC cable up to 150 m or unshielded cable 300 m Installation almost anywhere with IP20 / 21/55 and 66 enclosures Operation at high ambient temperature, up to 50 ° C operation in damp and polluted an environment with the possibility of coating up to level 3C3 according to IEC60721-3 for operation in damp and polluted areas Includes PTC thermistor input Water hammer protection

5. Thrust bearings protected by the start and end ramps Execute drought protection to prevent pump damage in case of water shortage End of the curve, to stop the pump in the event of a major leak, reduces water loss Sleep mode to stop the meter when there is no flow to save power Burraq Engineering Solutions is the best training institute in Lahore which is providing practical training of Electrical Automation and Short Electrical Courses including PLC course, SOLAR SYSTEM Installation and DESIGN COURSE, ETAP course, DIALUX course, Panel FABRICATION course, VFD course, ADVANCED Course Panel, SWITCHERGEAR design course, Building Electrical design course, and all electrical diploma courses. Both online and physical classes available. We introduce a platform Lyskills from where you can get lifetime access to your desire courses in very reasonable price.