Leeson Micro Series Compact Inverters Manual de usuario descargar pdf (Pagina 62)

22 TORQUE (TORQUECURVESELECTION)

 ThisparameterisusedtoselectwhethertheoutputofthedrivefollowsaconstantorvariableV/Hzcurve.

The following selections are available:

 CONSTANT Useforconstanttorqueapplicationstooptimizetorque.

 VARIABLE Useforvariabletorqueapplicationstooptimizeenergysavings.

 CT/NOCMP Useforconstanttorqueapplicationsthatrequirefulloverloadcapacityatlowspeeds

(seeParameter17-MOTOROL).

23 CARRIER (CARRIERFREQUENCY)

 Thisparametersetsthecarrierfrequency,orswitchingfrequencyoftheoutputIGBT’s.Higherswitching

rates result in less audible noise to be emitted from the motor, but the efficiency of the drive decreases as

the carrierfrequencyincreases.Therefore, this parameter should be settothelowest value which yields

acceptablesoundlevels.Availablesettingsare:2.5kHz,6.0kHz,8kHz,10kHz,12kHzand14kHz.

NOTE 1:The2.5kHzcarrierfrequencysettingisavariablecarrier.Thecarrierfrequencyremainsfixedat

1.5kHzupto25Hzoutputfrequency.Above25Hz,thecarrierisafixedmultipleof60timesthedrive’s

outputfrequency.Forexample,iftheoutputfrequencyofthedrivewassetto45Hz,thecarrierfrequency

wouldbe2.7kHz(45Hzx60=2700Hz).

NOTE 2:Theability tooperate adriveinthequiet (highcarrier frequency)modeisdependentonthe

drive horsepower rating, driven load, drive enclosure, and the ambient temperature. At full ambient tem-

perature,operationabove8kHzrequiresderatingthedrivebymultiplyingtheoutputcurrentratingbythe

followingfactors:0.94at10kHz,0.89at12kHz,and0.83at14kHz.

NOTE 3:IfthedriveisequippedwiththeHighOutputFrequencyoption,andMAXFRQissetabove120

Hz,CARRIERwillautomaticallychangeto14kHz,andtheCARRIERparameterwilldisappearfromthe

parameter menu. Operation at 14 kHz carrier frequency requires derating as shown in NOTE 2 above.

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Leeson Micro Series Compact Inverters Manual de usuario Pagina 62