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4.18 Silicone-Controlled Rectifier

TheACinputvoltageisconnectedtotheSCRsbytheMainsInputbusbars.TheSCRsareusedtoconverttheAC

voltageintoDCvoltage.SCRsmaintainthehighvoltageDCbusnecessarytoprovidepowertotheInvertertorun

thecompressormotor.

UsingboththeACinputvoltageandtheDCvoltageoutputfromtheSCRs,theSoftStartBoardgeneratesthegate

signalandoutputspulsesof0-12VDCtotheSCRstocontrolthein-rushcurrentwhenpowerisinitiallyappliedto

thecompressor.ThisisusedwhiletheDCcapacitorsarechargingup.

TheDCbusvoltageoutputfromtheSCRsisapproximately1.35timesthatoftheACinputvoltage(460-900VDC).

Therearetwo(2)differentstylesusedforthecompressors.RefertoFigure4-139SCRStylesforthevisualdifferences.



Figure 4-139 SCR Styles

4.18.1 SCR Connections

RefertoFigure4-140SCRConnections-TTS300/TGS230andFigure4-141SCRConnections-TTS/TGS/TTH/TGHRev.

FandEarlier(ExceptTTS300/TGS230)onpage142tolocatethefollowingconnectionstotheSCRs:

l

ACinputtoSCR

l

SCRGatecablestoSoftStart

l

SCRtoDCbus



Figure 4-140 SCR Connections - TTS300/TGS230



M-SV-001-EN Rev. H-1/23/2023 Page 141 of 294

Danfoss TTS350 User Manual

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