TROUBLESHOOTINGTESTING AND ADJUSTINGPOSSIBLE CAUSESVERIFICATION PROCEDURE48. Rotor Winding (L5) DefectIf generator voltage goes low again and again. or only when generatorgets to normal temperature for operation. rotor field (L5 )could be the cause.If exciter field (L3) current at no load, rated voltage and frequencyis more than rated no load current by 60c, the exciter field ( L3).exciter armature (L4). or the rotor field (L5) windings could bedefective. If Verification Procedure ,=5 shows no defect. the mainrotor winding (L5) is defective.If the exciter field current is within the limit at no load. check it a,close to rated condition (.8 power factor. rated volt and current)as possible.NOTE: For rated specifications make reference to ELECTRICALMECHANICAL CHARACTERISTICS.NOTE: A small change in power factor will change the field currentnecessary to give rated voltage. An increase in the power factorof the load will decrease the necessary field current.If it is not possible to operate the generator at rated load condition,.operate the generator 4 hours at a known load condition. Measurethe field current. To find acceptable field current for loadconditions other than rated, contact CATERPILLAR TRACTOR CO.71
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