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Developing Electrical Troubleshooting Tpc.docx

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DEVELOPING ELECTRICAL
TROUBLESHOOTING TPC



Thesoactualsolocationsoandsoroutingsoofsocircuitssoissoshownsoonsoaso-soans--
✔✔wiringsodiagram

Asopower-installationsodrawingsoshowsso-soans--✔✔onlysopowersooutlets

Changingsothesonumbersoofsomagneticsopolessoinsothesostatorsoofsoasosquirrel-
cagesomotorsopermitssothesomotorsotosorunso-soans--✔✔twosoorsomoresofixedsospeeds

Mostsoreversingsostarterssowithsolow-
voltagesoremotesopushbuttonssoaresoallsoofsothesofollowingsoEXCEPTso-soans--
✔✔mechanicallysointerconnected

Deteriorationsoinsoasoseleniumsorectifiersoissoindicatedsobyso-soans--
✔✔asogradualsorisesoinsothesoinputsocurrent

Insoautotransformersoinputsocircuits,soeachsoinputsolinesoshouldsobeso-soans--✔✔fused

WhichsoofsothesofollowingsoissoNOTsoasocommonsocausesoofsomechanicalsovibration?so-
soans--✔✔Wornsobrushes


Allsoofsothesofollowingsoaresocommonsoreasonssowhysoasosplit-
phasesomotorsomakessoasonoticeablesonoisesowhensooperating,soEXCEPTso-soans--
✔✔toosolittlesoendsoplay

Onsoansoelectricalsodiagram,soasocontrolsorelaysoissoindicatedsobysothesodesignationso-
soans--✔✔CR


Theso____________socircuitsoofsoansoelectricalsoschematicsoissothesosimplestsopartsoofsot
hesodiagramsoandsothesoeasiestsotosofollow.so-soans--✔✔power

Mixingsobrushsogradessoinsoasodcsomotorsocausesso-soans--
✔✔unequalsoloadsodistributionsoamongsobrushes

, AsofilmsoofsooilsoonsothesocommutatorsodoessoallsoofsothesofollowingsoEXCEPTso-soans--
✔✔prolongsobrushsolife

Overvoltage,soexcessivesocurrentsoandsotoo-
frequentsooperationsoaresopossiblesocausessoofso-soans--✔✔burnedsoorsoshort-
circuitedsomagnetsocoils

Asorelaysothatsohasso"dogs"solocatedsodirectlysoabovesothesooperatingsobarsoissocalledsoaso
____________sorelayso-soans--✔✔latching

Whichsoaresomostsoaffectedsobysoovervoltage?so-soans--✔✔Slow-
speedsomotors(notsosure)

Ifsoasomotorsostopssoforsonosoapparentsoreasonsoandsoyousoaresocalledsotosoinspectsotheso
motorsostarter,sothesofirstsothingsoyousoshouldsochecksoissotheso-soans--
✔✔tripsoleverssoonsothesothermalsooverloadsorelays

NEMAsorecommendssoseasoningsolinearsolampssoforso_____sohrsobeforesodimmingso-
soans--✔✔12


Thesocolorsotemperaturesoofsothesolightsoproducedsobysoasolampsoissoexpressedsoinsodegr
eesso-soans--✔✔Kelvin

Mechanicalsolinkagessoofsomotorsocontacts,sorelays,soandsosolenoidssoonsonewsoequipme
ntsoshouldso-soans--✔✔movesofreelysowhensothesomachinesoissoturnedsoon

Insothesoidentificationso8TR15XTO,sothesoXsoindicatesso-soans--✔✔normallysoclosed

Thermalsooverloadsorelayssocansogenerallysobesoresetsoaftersocoolingsoforsoaboutso-
soans--✔✔1sominute


Onesoaddedsofeaturesoofsonewersomotorsostarterssoissoasosingle-
phasesosensorsothatsodetectsso-soans--✔✔currentsounbalance

Asocircuitsothatsoprovidessoundervoltagesoreleasesoandsohassotwosowiressoconnectedsotoso
thesopilotsodevicesothatsoenergizessothesomagneticsocontrolsocircuitsoissosaidsotosohaveso-
soans--✔✔two-wiresocontrol


Theso____________socontactssoonsoasomotorsostartersoprovidesoasoparallelsopathsoforsoth
esocurrentsotosothesocoilso-soans--✔✔auxiliary

Mostsomethodssoofsoreducingsomotorsospeedsowhensousingsomultispeedsocontrollerssoinv
olvesothesooperatorso-soans--✔✔pressingsothesoSTOPsobutton

Operatingsoasoheavilysoloadedsomotorsoatso__________socansocausesoasohighsoslipso-
soans--✔✔reducedsovoltage

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