SIMOVERT MASTERDRIVES Vector Control - Industry

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SIMOVERT MASTERDRIVES Vector ControlEngineering InformationMulti-motor drivesCompact and chassis unitsCabinet unitsRectifier/regenerative units (continued)The rectifier/regenerativeunits require a relative impedancevoltage of at least5 % on the supply side. Thisis achieved by usinga4%line commutating reactor oran appropriate convertertransformer. The rectifier/regenerative units are decoupledfrom the supply andsystem perturbations arelimited in accordance withDIN VDE 0160.The maximum relativeimpedance voltage mustnot, however, exceed 10 %.In practice, the followingcombinations can beexpected.Supply(transformer)Linereactorv D 3% 4% 2%3%
Compact and chassis unitsCabinet unitsSIMOVERT MASTERDRIVES Vector ControlEngineering InformationOvercurrent protector units (OCP)Overcurrent protector units for rectifier/regenerative unitsThe OCP unit can be used fornew projects and existing installations.For the scope ofsupply and the assignmentto rectifier/regenerativeunits, see Section 3.When it is retrofitted, thepositive busbar between therectifier/regenerative unitand the inverter has to be dividedand the OCP unit thenlooped in. The negativebusbar is not affected (thecorrect flow of current mustbe ensured – incoming currentvia diode, feedback currentvia IGBT). The OCP unitmust be built into an additionalcabinet or, in the caseof retrofitting, on the roof ofan existing cabinet (horizontal).The units are air-cooled. Itmust be ensured that the additionalheat loss which occurscan be removed. It iscalculated as the product of the DC link current and thediode’s forward voltage insupply mode or the DC link current and thevoltage drop at the IGBT inregenerative mode.The efficiency of the rectifier/regenerativeunit is onlyminorly influenced.If the motor current is constant,the DC link currentdepends on the speed. Foran economically efficient designof the rectifier/regenerativeunit and the OCP unit,this feature of operationmust be taken into account.Only at full speed, for example,is the full motor currenttaken as DC link current. Atlower speeds, the DC linkcurrent can be reduced proportionally.For this reason,the OCP unit has been designedin duty class II in invertermode with a deltafunction (see page 3/36, Fig.3/11).The necessary version of thehardware and software ofrectifier/regenerative unitsmust be checked, especiallywhen retrofitting:1AC 50 - 60 Hz, 230 VX95Fig. 6/30Connection diagram of the controller CUR electronics board ofthe rectifier/regenerativeunit: Version 13.Order No. for upgrading:6SE7090-0XX85-1DA0(without EPROM)4321X36K1 Software version for rectifier/regenerativeunit: Version 4.5.Order No. for upgrading:6SW1701-0DA14 (EPROM).As a component of theSIMOVERT MASTERDRIVESdrive system, the OCP unit isprotected by the fuses in therectifier/regenerative unitand in the DC link of the inverterand does not requireextra fusing. It is self-protectedby the electronicallytriggered power cut-off featurein normal operation.Similar to the rectifier/regenerativeunits, the OCP unitmust be supplied with 24 VDC from an external sourcebecause of the electronics(maximum power intake0.5Aat24V).Due to air-current monitoring,the OCP unit's fan mustalways be connected in circuitwith the external 24 VDC supply (see Fig. 6/30).Here, a switch-off delay(approx. 15 s) of K111 is advantageousdue to fan coasting.K1112 1 X9 5 4 3 2 1 X19 4U1 4N1K1-2 K2 K1 F1 F3A23C98043-A1685A10C98043-A1680CURXKIPP1K MK1 ...K111 ...Main contactor forrectifier/regenerative unitContactor for fan andpower supply of OCPRectifier/regenerative unitXKIPP1K M K M + K1 M1OCPM1~24 VPower supplyunit+ -E1to the OCP of theparallel unitXKIPP1DA65-6061bADue to the OCP unit’s ownair-current monitoring function,the equipment is preventedfrom being switchedoff in an uncontrolled mannerin the event that the OCPunit fan is defective (warningsignalled by a floating relaycontact, fault signalled by anotherfloating relay contact).Inside the unit, the fan is protectedby a fuse. The fantype and fuse are the sameas those in the rectifier/regenerativeunit.6Siemens DA 65.10 · 2003/20046/21
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