SIMOVERT MASTERDRIVES Vector Control - Industry

Compact PLUS/compact andchassis units · cabinet unitsSIMOVERT MASTERDRIVES Vector ControlEngineering InformationDimensioning the power section and drive Ambient temperatureFig. 6/4Reduction factor k T for installation altitudes from 1000 m to 4000 mabove sea levelPermissible continuous currentas a % of the rated current Install. altit. above sea levelFig. 6/5Reduction factor k I for installation altitudes from 1000 m to 4000 mabove sea levelPermissible supply voltageas a % of the rated voltage Fig. 6/6Reduction factor k V for installation altitudes from 1000 m to 4000 mabove sea level Install. altit. above sea levelFor sizes A, B, C, D and P (compact and Compact PLUS units)37 kW to 45 kW at 3-ph. 500 V to 600 V AC/675 V to 810 V DC55 kW to 1500 kW at 3-ph. 660 V to 690 V AC/890 V to 930 V DC55 kW to 1100 kW at 3-ph. 525 V to 600 V AC/708 V to 810 V DC 45 kW at 3-ph. 380 V to 480 V AC/510 V to 650 V DC55 kW to 1100 kW at 3-ph. 500 V AC/675 V DCInstallation conditions andcorrection factorsIf the MASTERDRIVES unitsare operated at installationaltitudes up to 1000 m abovesea level and at ambientor coolant temperatures of> 40 °C, the current reductionfactors in Fig. 6/3 are tobe observed for the ratedcurrent.Current reduction (correctionfactor k I as shown in Fig. 6/5)is also necessary if the unitsare used at installation altitudesof between 1000 mand 4000 m. In the case oflower ambient temperatures(see Fig. 6/4), this currentreduction can, if necessary,be compensated by thecorrection factor, k T .I I UN · k I · k T ; I < I UNI q Permissible continuouscurrentI UN q Rated currentExample:Installation altitude: 2000 mMax. ambient temp.: 30 °CCorrection factor k I = 0.9Correction factor k T = 1.25I I UN · 0.9 · 1.25 = I UN ·1.125But I I UNResult: Current reduction isnot necessary in this example.In the case of installationaltitudes of > 2000 m, inaddition to current derating,voltage reduction isnecessary in accordancewith IEC 60 664-1.The voltage reduction shouldbe carried out in accordancewith the correction factor k Vin Fig. 6/6.Example:Unit 6SE7026-6FE60Installation altitude: 3000 mMax. ambient temperature:30 °C3-ph. 500 V to 600 V AC,45 kW, 66 ACorrection factor k I = 0.84Correction factor k T = 1.25Correction factor k V = 0.88Result: Current reduction isnot necessary. Due to thevoltage reduction given inFig. 6/6 (solid line), the convertercan still be operatedconnected to a supply voltageof 3-ph. 500 V AC.Large rating inverters –Output interphasetransformerThe largest power ratingsof the SIMOVERT MASTER-DRIVES Vector Controlseries of converters are realisedby connecting 2 invertersin parallel. In order toensure that loading is uniformlydistributed betweenthe two inverters, an interphasetransformer is usedon the converter output(see Fig. 6/7).This applies to the followingconverter/inverter ratings: 900kWat400V(only chassis units), 1000 kW and 1100 kW at500 V, 1300 kW and 1500 kW at690 V.Operation withoutinterphase transformerIf the motor to be connectedhas 2 electrically isolatedwinding systems which havethe same voltage and thesame phase position, theoutputs of both invertersections can be connecteddirectly to the two windingsystems of the motor. Thetwo magnetically coupledwindings then have thesame effect as an interphasetransformer. An additionalinterphase transformer isthen no longer necessary.1LA1 type motors for 690 Vcan be supplied with 2 electricallyisolated winding systems.They are to be orderedwith the voltage code 1(11th position of the OrderNo., e.g. 1LA1 503-4PM1).6Siemens DA 65.10 · 2003/20046/3