Danfoss VLT AQUA Design Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Operating instructions

Contents

to perform AMA. If AMA fails, the motor data can be set from parameter group 1-3* (see motor datasheet). Be aware that if AMA has succeededthe drive will compensate for voltage drop in the long motor cables, so if the Advanced motor data are set manually, the length of the motorcable must be taken into considerations to optimize system performance.4. It is important that the system is operated with a minimum of wear and tear of the pump and motor. A Danfoss Sine-Wave filter can lower themotor insulation stress and increase lifetime (check actual motor insulation and VLT AQUA Drive du/dt specification). It is recommended to usea filter to reduce the need for service.5. EMC performance can be difficult to achieve due to the fact that the special pump cable which is able to withstand the wet conditions in the wellnormally is unscreened. A solution could be to use a screened cable above the well and fix the screen to the well pipe if it is made of steel (canalso be made of plastic). A Sine-Wave filter will also reduce the EMI from unscreened motor cables.The special “can motor” is used due to the wet installation conditions. The drive needs to be designed for the system according to output current to beable to run the motor at nominal power.To prevent damage to the thrust bearings of the pump, it is important to ramp the pump from stop to min. speed as quick as possible. Well-knownmanufacturers of submersible pumps recommend that the pump is ramped to min. speed (30 Hz) in max. 2 -3 seconds. The new VLT© AQUA Drive isdesigned with Initial and Final Ramp for these applications. The Initial and Final ramps are 2 individual ramps, where Initial Ramp, if enabled, will rampthe motor from stop to min. speed and automatically switch to normal ramp, when min. speed is reached. Final ramp will do the opposite from min. speedto stop in a stop situation.Pipe-Fill mode can be enabled to prevent water hammering. The Danfoss VLT AQUA Drive is capable of filling vertical pipes using the PID controller toslowly ramp up the pressure with a user specified rate (units/sec). If enabled the drive will, when it reaches min. speed after startup, enter pipe fill mode.The pressure will slowly be ramped up until it reaches a user specified Filled Set Point, where after the drive automatically disables Pipe Fill Mode andcontinues in normal closed loop operation.This feature is designed for irrigation applications.Electrical WiringTypical parameter settingsTypical/recommended settings in brackets().Parameters:Motor Rated Power Par. 1-20 / par. 1-21Motor Rated Voltage Par. 1-22Motor Current Par. 1-24Motor Rated Speed Par. 1-28Enable Automatic Motor Adaptation (AMA in par. 1-29)NB!Please set analogue input 2, (terminal (54) format tomA. (switch 202).Min. Reference Par. 3-01 (30 Hz)Max. Reference Par. 3-02 (50/60 Hz)Initial Ramp Up Time Par. 3-84 (2 sec.)Final Ramp Down Time Par. 3-88 (2 sec.)Normal Ramp Up Time Par. 3-41 (8 sec. depending on size)Normal Ramp Down Time Par. 3-42 (8 sec. depending on size)Motor Min. Speed Par. 4-11 (30 Hz)Motor Max. Speed Par. 4-13 (50/60 Hz)Use the “Closed Loop” wizard under “Quick Menu_Funtion_Setup”, to easily set up the feedback settings in the PID controller.Pipe Fill ModePipe Fill Enable Par. 29-00Pipe Fill Rate Par. 29-04 (Feedback units/sec.)Filled Set Point Par. 29-05 (Feedback units)VLT® AQUA Drive Design Guide 6. Application ExamplesMG.20.N3.02 - VLT® is a registered Danfoss trademark 1216