Owner manual

ULTRA-CUT 100 XT
A-64 APPENDIX Manual 0-5272
4. IftheincomingvoltageisOKandtheproblempersistsitmaybeSystemBias,CCMorconnectionbetween
J62andJ27.
a. IftheincomingvoltageisOKandD14,ACVLOW,isonorthesignal“ACVLOWb”onJ62-10is“high”
(about24VDC,relativetoTP1orJ62-8)theSystemBiasboardisdefective.
b. IfD14isnotonandsignal“ACVHIGHb”onJ62-10is“low”(about10-14VDC,relativetoTP1orJ62-8)
thenSystemBiasisOKandproblemisintheCCM.
c. IfJ62-10isnearzerovoltstheremaybeabadconnectionbetweenJ62-10andJ27-10orJ62-7andJ27-7.
241-246 Inverter Section Input Voltage Error.
TheSystemBiasboardchecksforinputvoltagehigh,lowormissingaphasefromthepowercominginfromthe
powercord.Itisunlikelybutnotimpossiblethataproblemwiththeincomingpowercouldresultin241-246
codes.The241-246codesmorelikelypointtoproblemswiththepowerintoorwithinasingleinvertersection
orinthecaseofmissingphaseitmaybethecontactorthatsuppliesupto3invertersections.
Oncetheinputcontactorsclose,applyingvoltagetotheinverters,theytestforinputtoohighortoolowand
formissingphase.Whentheinputvoltageisinthecorrectrange,agreenLED,D4,namedREADY,lightson
theleftsideofthemaininverterboard.IfD4isnoton,eithertheinputvoltageisoutofrangeortheinverter
isdefective.
Youcanstillgetthe241-246codewithamissingphasewiththeREADYLEDon.TheLEDwillbegoingon
and off rapidly but appears to the eye to be on. In this case you can measure the signal on the ribbon cable.
ThesignalpreviouslycalledREADYisnowcalledAC_INPUT_FLT.Itisadifferentialsignalonpins1(+)&
2(-)oftheinverters30pinribboncable.IftheACinputiscorrectyoushouldread5-6Vbetweenthepins.If
AC_INPUT_FLTistruevoltageonpins1&2willbelessthan2V.
SomeoftheotherfaultssuchasInverterFaultandOverTemperaturealsosettheAC_INPUT_FLT(notReady).
However,theywilllatchonassociatedLEDsorsetdifferentfaultcodes.IntheeventofanInputVoltageFault
theCCMdoesnotremovepowerfromtheinverter.
Things that can cause Input Voltage Fault codes:
1. Intermittentlyhavingthepowerdropoutononeormorephasesforatleast1ms.alongertermlosswould
morelikelytriggeradifferentfault.Ifit’stheincomingpoweritwouldbelikelynotalwaysbethesame
inverter.
2. Phasemissingorintermittenttoaspecicinverterthefaultwouldalwayscalloutthatinverter.
3. Intermittentconnectionsonthefaultsignalinternaltotheinverter.
247-252 Inverter Fault
Oncetheinputcontactorscloseapplyingvoltagetotheinvertersseveraltestsareperformed.TheInverterFault
signallatchesonsoevenifthecausehasgoneawayyoucanseethattherewasafaultasindicatedbyredLED
D1,INVFLTontheinverterControl&FaultPCB.Itisresetbyapplyingstartsignalorcyclingpower.Ifthe
fault is still present it will come back on.
Thingsthatcauseaninverterfault:
• Oneormoreofthelocalbiassupplies(+/-12VDC)failedoroutofspec.GreenLEDsonCapBiasboard
labeled+12V(D13)&-12V(D6)indicatethesuppliesarepresentbutnotnecessarilythattheyareintoler-
ance.
• InputcapacitorvoltageimbalanceindicatedbyD3CAPIMBALANCELED(red)onleftsideofmain
inverterboard.Appliestounitswithseriesconnectedcapacitors(380-480Vunits).
• Toomuchcurrentinthemaintransformer(switchingtransformer)primary,D32,PRIOCLED(red),on
invertercontrolboard.
INV_FLTisadifferentialsignalonpins3(+)&4(-)oftheinverters30pinribboncable.Ifthereisnotafaultyou
shouldread5-6Vbetweenthetwopins.IfINV_FLTistruevoltageonpins3&4willbelessthan2V.