SIMOVERT MASTERDRIVES Vector Control - Industry

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SIMOVERT MASTERDRIVES Vector ControlEngineering InformationMulti-motor drivesCompact and chassis unitsCabinet unitsRectifier/regenerative units (continued)6When planning parallelswitching, it must be ensuredthat (due to the distributionof current among thepower sections) the outputcurrent is 10% less than thetotal of the rated currents ofthe individual power sections.For uniform distribution ofcurrent between the basicunit and parallel unit(s), thefollowing is necessary: Use of identical power sections(for assignment of basicunit and parallel unit(s),see table) Phase coincidence at therectifier/regenerativepower-section connectionsbetween basic unit and parallelunit(s) Separate commutatingreactors and (in the case ofrectifier/regenerative units),separate autotransformerwith the same technicaldata for basic unit and parallelunit(s). Each individualparallel path must have aminimum v k value of 2%.Rectifier/regenerative unitsIn the case of very high v kvalues of the incomingpower supply (“soft powersupply“), primary connectionof the autotransformer mustbe directly at the point of incomingpower (before thecommutating reactors). Thisis necessary to ensure thatthe total v k value in the regenerativedirection is nottoo high.If the total v k value in the regenerativedirection is veryhigh, the thyristor commutatingtime is increased, thusmaking it necessary to reducethe inverter stabilitylimit (parameter P776). Thiscan make it necessary tolower V d .Preconditions: Same fuses for basic unitand parallel unit(s) Same cable lengths to thepower-section terminals ofbasic unit and parallelunit(s) Do not use any output reactorsin the DC linkThe maximum permissibletotal cable length betweenbasic unit and parallel unit 1or (if present) parallel unit 2 is15 m.The scope of supply of a parallelunit includesa4m50-pole shielded round cable(Order No. as spare part:6SY7010-8AA00).Order No. for 10 m cable,round, shielded: 6QX5368(other lengths on request).Up to 3 size-K units can beconnected in parallel. Theparallel circuit consists of amaster unit and up to 2 slaveunits (see Section 3). For uniformdivision of power, linecommutating reactors withat least 2% v k must be provided.In this case, the ratedcurrent must be reduced by10%.Fig. 6/26Parallel circuit with rectifier unitsLineLineFig. 6/27Arrangement of “rigid power supply“Base unitInfeedX27X28Parallel unit 1InfeedX27X28Parallel unit 2InfeedBase unitInfeedRegenerationX27X28Parallel unit 1InfeedRegenerationX27X28Parallel unit 2InfeedRegenerationBase unitInfeedRegenerationA DA65-6057A DA65-6058DC linkDC linkX27X28LineParallel unit 1InfeedRegenerationX27X28DC linkParallel unit 2InfeedRegenerationADA65-6059Fig. 6/28Arrangement of “soft power supply”6/18Siemens DA 65.10 · 2003/2004
Compact and chassis unitsCabinet unitsSIMOVERT MASTERDRIVES Vector ControlEngineering InformationMulti-motor drivesRectifier/regenerative units (continued)12-pulse operationStandard designSupplying two rectifier/ supply connecting panel forregenerative units via a motoring rectifier bridgesthree-winding transformerenables 12-pulse operation.supply connecting panelIn order to enable a uniformfor generating, anti-parallelload distribution for theserectifier bridgesrectifier/regenerative units 6-pulse thyristor bridge forand thus optimum working the motor torque direction;of the 12-pulse system, a line 6-pulse anti-parallel thyristorbridge for the generativecommutating reactor with atleast 2% v k (not required in torque direction; earthfault-proofprecharging.the case of a double-tiertransformer) is necessary ineach secondary-side system. PMU parameterizing andoperator control unitNote electronics box with CUR12-pulse operation with size control boardH and K units takes place in amaster-slave configuration. DC link connecting panelInterface adapters (Order No.6SE7090-0XX85-1TA0) andseparate cables are necessary,see Fig. 6/21 and alsoselection and ordering data,page 3/32.NoteRectifier/regenerative unitscan only supply a certainnumber of inverters. Thetotal DC link current flowingon the inverter side mustnot exceed the rated outputDC link current of therectifier unit. When selectingthe rectifier unit, thismeans that the DC linkcurrents of inverters in regenerativemode are subtractedfrom the DC linkcurrents of inverters inmotoring mode. It mustalso be noted that the rectifierunit has to prechargethe whole effective DC linkcapacity of the drive.This results in the followingruling regarding dimensions:I 0.3...1 Izkb eezkb wrbI zkb ee : Rated output DClink current of therectifier/regenerativeunitI zkb wr : Rated DC link currentof the inverters6Siemens DA 65.10 · 2003/20046/19
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