Danfoss VLT Brook Crompton Motor FCM 300 Design Manual

Contents

Danfoss VLT Brook Crompton Motor FCM 300 Design Manual Manual pdf 82 page image

Illustration 4.5 Torque characteristic4.1.11 Vibration and ShockFCM 300 Series has been tested according to a procedurebased on the following standards:IEC 60068-2-6: Vibration (sinusoidal) - 1970IEC 60068-2-34: Random vibration broad-band- general requirementsIEC 60068-2-35: Random vibration broad-band- high reproducibilityIEC 60068-2-36: Random vibration broad-band- medium reproducibilityTable 4.2FCM 300 Series complies with requirements thatcorrespond to conditions in the standards mentionedabove.4.1.12 Air HumidityFCM 300 Series has been designed to meet the IEC60068-2-3 standard, EN 50178 item 9.4.2.2/DIN 40040, classE, at 40° C.Cyclic damp heat according to IEC 60068-2-30, 40° C.4.1.13 UL StandardFCM 300 Series is UL approved.See 2.1.2 General Technical Data for correct use of prefuses.4.1.14 EfficiencyEfficiency of the Frequency Converter (ηVLT)The load on the frequency converter has little effect on itsefficiency. In general, the efficiency is the same at therated motor frequency fM,N, even if the motor supplies100% of the rated shaft torque or only 75%, i.e. in case ofpart loads.This also means that the efficiency of the frequencyconverter does not change even if other U/f characteristicsare chosen.However, the U/f characteristics influence the efficiency ofthe motor.The efficiency declines a little when the switchingfrequency is set to a value of above 5 kHz. The efficiencywill also be slightly reduced if the mains voltage is 480 V.Efficiency of the motor (ηMOTOR )The motor of the FCM 300 is designed according to IE2and tested correspondingly after IEC 60034-1.The efficiency of a motor connected to the frequencyconverter depends on magnetizing level. With optimizeddata, the efficiency is just as good as with mains operation.In the range of 75-100% of the rated torque, the efficiencyof the motor is practically constant, both when it iscontrolled by the frequency converter and when it wouldrun directly on mains. The influence from the switchingfrequency on efficiency is marginal.Efficiency of the system (ηSYSTEM)To calculate the system efficiency (FCM), the efficiency ofthe frequency converter (ηVLT) is multiplied by theefficiency of the motor (ηMOTOR): ηSYSTEM = ηVLT x ηMOTORAll about FCM 300 VLT® DriveMotor FCM Series80 MG03BA02 - VLT® is a registered Danfoss trademark44