Danfoss VLT AQUA Drive FC 202 Design Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

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Danfoss VLT AQUA Drive FC 202 Design Manual Manual pdf 60 page image

3.4 Motor Integration3.4.1 Motor Selection ConsiderationsThe adjustable frequency drive can induce electrical stresson a motor. Consider, therefore, the following effects onthe motor when matching motor with adjustablefrequency drive:• Insulation stress• Bearing stress• Thermal stress3.4.2 Sine-wave and dU/dt FiltersOutput filters provide benefits to some motors to reduceelectrical stress and allow for longer cable length. Outputoptions include sine-wave filters (also called LC filters) anddU/dt filters. The dU/dt filters reduce the sharp rise rate ofthe pulse. Sine-wave filters smooth the voltage pulses toconvert them into a nearly sinusoidal output voltage. Withsome adjustable frequency drives, sine-wave filters complywith EN 61800-3 RFI category C2 for non-shielded motorcables, see chapter 3.7.5 Sine-wave Filters.For more information on sine-wave and dU/dt filteroptions, refer to chapter 3.7.5 Sine-wave Filters andchapter 3.7.6 dU/dt Filters.For more information on sine-wave and dU/dt filterordering numbers, refer to and chapter 6.2.9 dU/dt Filters.3.4.3 Proper Motor GroundingProper grounding of the motor is imperative for personalsafety and to meet EMC electrical requirements for lowvoltage equipment. Proper grounding is necessary for theeffective use of shielding and filters. Design details mustbe verified for proper EMC implementation.3.4.4 Motor CablesMotor cable recommendations and specifications areprovided in chapter 7.5 Cable Specifications.All types of three-phase asynchronous standard motors canbe used with an adjustable frequency drive unit. Thefactory setting is for clockwise rotation with the adjustablefrequency drive output connected as follows:175HA036.11U1 V1 W196 97 98FCMotorU2 V2 W2U1 V1 W196 97 98FCMotorU2 V2 W2Figure 3.10 Terminal Connection for Clockwise and Counter-clockwise RotationChange the direction of rotation by switching two phasesin the motor cable or by changing the setting of4-10 Motor Speed Direction.3.4.5 Motor Cable ShieldingAdjustable frequency drives generate steep-edged pulseson their outputs. These pulses contain high-frequencycomponents (extending into the gigahertz range), whichcause undesirable radiation from the motor cable. Shieldedmotor cables reduce this radiation.The purposes of shielding are to:• Reduce the magnitude of radiated interference.• Improve the interference immunity of individualdevices.The shield captures the high-frequency components andconducts them back to the interference source, in this casethe adjustable frequency drive. Shielded motor cables alsoprovide immunity to interference from nearby externalsources.System Integration VLT® AQUA Drive FC 20258 Danfoss A/S © 09/2014 All rights reserved. MG20N62233