Danfoss VLT AutomationDrive FC 300 Design Manual

Also see for VLT AutomationDrive FC 300: Instruction manual Operating instructions Design guide Service manual Operating instructions

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Danfoss VLT AutomationDrive FC 300 Design Manual Manual pdf 69 page image

Enclosure kit available ≤ 7.5 kW IP21/TYPE 1/IP 4X topVibration test < 90 kW 1.0 g RMSVibration test ≥ 90 kW 0.7 gMax. relative humidity 5% - 93%(IEC 60 721-3-3; Class 3K3 (non-condensing) during operationAggressive environment (IEC 60068-2-43) H2S test class KdTest method according to IEC 60068-2-43 H2S (10 days)Ambient temperature < 90 kW Max. 50 °C (24-hour average maximum 45 °C)Ambient temperature ≥ 90 kW Max. 45 °C (24-hour average maximum 40 °C)Derating for high ambient temperature, see section on special conditionsMinimum ambient temperature during full-scale operation 0 °CMinimum ambient temperature at reduced performance - 10 °CTemperature during storage/transport -25 - +65/70 °CMaximum altitude above sea level 1000 mDerating for high altitude, see section on special conditionsEMC standards, Emission EN 61800-3, EN 61000-6-3/4, EN 55011EMC standards, ImmunityEN 61800-3, EN 61000-6-1/2,EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6See section on special conditionsControl card, USB serial communication:USB standard 1.1 (Full speed)USB plug USB type B “device” plugConnection to PC is carried out via a standard host/device USB cable.The USB connection is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.The USB ground connection is not galvanically isolated from protection earth. Use only an isolated laptop as PC connection to the USB connector onthe frequency converter.4.5.1. EfficiencyEfficiency of the frequency converter (η VLT)The load on the frequency converter has little effect on its efficiency. In general, the efficiency is the same at the rated motor frequency fM,N, even if themotor supplies 100% of the rated shaft torque or only 75%, i.e. in case of part loads.This also means that the efficiency of the frequency converter does not change even if other U/f characteristics are chosen.However, the U/f characteristics influence the efficiency of the motor.The efficiency declines a little when the switching frequency is set to a value of above 5 kHz. The efficiency will also be slightly reduced if the mainsvoltage is 500 V, or if the motor cable is longer than 30 m.Efficiency of the motor (ηMOTOR )The efficiency of a motor connected to the frequency converter depends on magnetising level. In general, the efficiency is just as good as with mainsoperation. The efficiency of the motor depends on the type of motor.In the range of 75-100% of the rated torque, the efficiency of the motor is practically constant, both when it is controlled by the frequency converterand when it runs directly on mains.In small motors, the influence from the U/f characteristic on efficiency is marginal. However, in motors from 11 kW and up, the advantages are significant.In general, the switching frequency does not affect the efficiency of small motors. Motors from 11 kW and up have their efficiency improved (1-2%). Thisis because the sine shape of the motor current is almost perfect at high switching frequency.Efficiency of the system (ηSYSTEM )To calculate the system efficiency, the efficiency of the frequency converter (ηVLT ) is multiplied by the efficiency of the motor (ηMOTOR):FC 300 Design Guide 4. FC 300 SelectionMG.33.BA.02 - VLT® is a registered Danfoss trademark 694