Beijer-electronics BFI-P2 V1.21 Manual de usuario descargar pdf (Pagina 51)

UserGuideRevision1.121

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www.beijerelectronics.com

51

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10.4. DeratingInformation

Deratingofthedrivemaximumcontinuousoutputcurrentcapacityisrequirewhen

• Operatingatambienttemperatureinexcessof40°C/104°F

• OperatingatAltitudeinexcessof1000m/3281ft

• OperationwithEffectiveSwitchingFrequencyhigherthantheminimumsetting

Thefollowingderatingfactorsshouldbeapplied

whenoperatingdrivesoutsideoftheseconditions

10.4.1. DeratingforAmbientTemperature

EnclosureType MaximumTemperature

WithoutDerating

Derateby MaximumPermissable

IP20 50°C/122°F N/A 50°C

IP40 40°C/104°F N/A 40°C

IP55 40°C/104°F 1.5%per°C(1.8°F) 50°C

IP66 40°C/104°F 2.5%per°C(1.8°F) 50°C

10.4.2. DeratingforAltitude

EnclosureType MaximumAltitude

WithoutDerating

Derateby MaximumPermssable

(ULApproved)

MaximumPermssable

(Non‐ULApproved)

IP20 1000m/3281ft 1%per100m/328ft 2000m/6562ft 4000m/13123ft

IP40 1000m/3281ft 1%per100m/328ft 2000m/6562ft 4000m/13123ft

IP55 1000m/3281ft 1%per100m/328ft 2000m/6562ft 4000m/13123ft

IP66 1000m/3281ft 1%per100m/328ft 2000m/6562ft 4000m/13123ft

10.4.3. DeratingforSwicthingFrequency

 SwitchingFrequency(Whereavailable)

EnclosureType 4kHz 8kHz 12kHz 16kHz 24kHz 32kHz

IP20 N/A N/A 20% 30% 40% 50%

IP40 N/A TBC TBC TBC TBC TBC

IP55 N/A 10% 10% 15% 25% N/A

IP66 N/A 10% 25% 35% 50% 50%

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10.4.4. ExampleofapplyingDeratingFactors

A4kW,IP66driveistobeusedatanaltitudeof2000metresabovesealevel,with12kHzswitchingfrequencyand45°Cambienttemperature.

Fromthetableabove,wecanseethattheratedcurrentofthedriveis9.5Ampsat40°C,

Firstly,applytheswitchingfrequencyderating,12kHz,25%derating

9.5Ampsx75%=7.1Amps

Now,applythederatingforhigherambienttemperature,2.5%per°Cabove40°C=5x2.5%=12.5%

7.1Ampsx87.5%=6.2Amps

Nowapplythederatingforaltitudeabove1000metres,1%per100mabove1000m=

10x1%=10%

7.9Ampsx90%=5.5Ampscontinuouscurrentavailable.

Iftherequiredmotorcurrentexceedsthislevel,itwillbenecessarytoeither

‐ Reducetheswitchingfrequencyselected

‐ Useahigherpowerrateddriveandrepeatthecalculationtoensuresufficientoutputcurrent

isavailable.

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