Invertek Drives OPTIDRIVE P2 Series - Derating Information

OptidriveODP‐2UserGuideRevisions1.30
50
www.invertekdrives.com
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10TechnicalData
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forencloseddrives(nonULapproved)
• OperatingatAltitudeinexcessof1000m/3281ft
• OperationwithEffectiveSwitchingFrequencyhigherthantheminimumsetting
Thefo
llowing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
(ULApproved)
Derateby MaximumPermissable Operating
AmbientTemperaturewith
Derating(NonULApproved)
IP20 50°C/122°F N/A 50°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
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%
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swicthing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neccesarytoeither
‐ Reducetheswitchingfrequencyselected
‐ Usea higherpowerrateddriveandrepeatthecalculationtoensuresufficientoutputcurrentisavai
lable.
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