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
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
