Danfoss Turbocor TT Series User Manual

9. Usinganappropriately-ratedvoltmeterwiththe1000VDCrangeselected,insertthepositivevoltmeter
leadintotheDC(+F)testharnesslead,andthenegativevoltmeterleadintotheDC(-)testharness
lead.IfthevoltagecorrespondstoTable1-2ExpectedDCBusVoltage,theDCbusvoltageiscorrectand
HVDC(F1)fuseontheSoftStartisintact.ThiswouldimplythattheSoftStartandSilicon-Controlled
Rectifiers(SCRs)arefunctioningcorrectly;proceedtoStep12.Ifvoltagereads0,gotoStep10.
Table 1-2 Expected DC Bus Voltage
Compressor Nameplate AC Voltage Acceptable AC Voltage Range Expected DC Bus Voltage Range
575VAC 518-632VAC 700-853VDC
460VAC 414-506VAC 559-683VDC
400VAC 360-440VAC 486-594VDC
380VAC 342-418VAC 462-564VDC

10. LeavingtheDC(-)testleadinplace,relocatethepositive(+)testleadtoDC(+).IfDCvoltageis
consistentwithTable1-2ExpectedDCBusVoltage,thiswouldimplythattheSoftStartandSCRsare
workingcorrectly,buttheHVDCfuse(F1)ontheSoftStartisanopencircuit,refertoSection4.24High
VoltageDC-DCConverteronpage204toverifytheDC-DCConverter.
11. IftheDCvoltageisnotpresentorisnotconsistentwithTable1-2ExpectedDCBusVoltage,the
incomingACvoltageshouldbeverifiedtobebetweentheacceptableACVoltageRangelistedinTable
1-2ExpectedDCBusVoltage.AdditionallytheF2,F3,F4,F5,andF6fusesneedtobeverifiedaswellas
theSCRDiodesandSCRGates.RefertoSection4.18Silicone-ControlledRectifieronpage141for
testingdetails.
12. ForthePottedDC-DC,resetmultimeterscalingtoread15VACandconnecttothe15VACleadsofthe
DCBusTestHarness.Ifthereadingiszero,isolatethethree-phasesupplyinaccordancewithSection
1.8ElectricalIsolationonpage22.Whenaccessissafe,removethefour(4)fastenersthatholdtheSoft
Startinposition,andcheckfusesF2,F3,F4,F5,andF6forcontinuity.Ifanyfuseisfoundtobeanopen
circuit,replaceitandreturntoStep6.
13. Ifthe15VACisnotpresentforthePottedDC-DC,replacetheSoftStart(refertoSection4.14.3Soft
StartRemovalandInstallationonpage117).Ifthe15VACiscorrect,proceedtothenextstep.
14. Whenfinished,removetheDCBusTestHarness.RefertoSection1.10.4GeneralDCBusTestHarness
Removalonpage31.

• • • DANGER! • • •
TheDCbustestharnessisnotdesignedtobeleftinthecompressorduringnormaloperation.Whenchecksarecomplete,disconnectand
removethetestharness.

M-SV-001-EN Rev. H-1/23/2023 Page 29 of 294

Danfoss Turbocor TT Series Specifications

General

Brand	Danfoss
Model	Turbocor TT Series
Category	Air Compressor
Language	English