TROUBLESHOOTINGTESTING AND ADJUSTINGTemperature has an effect on electrical equipment.When measuring resistance of a cold components, youwill get a lower indication than you will at highertemperatures. Ohmmeters in general are not accurate.Given values of resistance will be different (op to 10percent), if the total error of instrument method,temperature and the tolerance of the part add in onedirection.TROUBLESHOOTING PROCEDURES FORGENERATOR/REGULATORThere are four test sequence charts inTroubleshooting Procedures. Each is for a differentproblem. The problems are:No AC VoltageLow AC VoltageHigh AC VoltageUnstable AC VoltageNOTE: Before making any of the tests. firstread all the information on this page and allthe information in General and in TestInstruments.Follow the test sequence chart exactly. This testsequence chart is in a logical order to find the problemwith the minimum amount of time and work. By makingeach test in the exact step-by-step order shown on thetest sequence chart, the serviceman can be sure that, atthe end of the test sequence chart, the components areall good.NOTE: If a bad part is found and areplacement part is installed, test thereplacement part also. Then do the rest ofthe tests as shown in the test sequencechart. In this way all the bad parts will befound. This is important because one badpart can cause damage to several otherparts. Then do the PROCEDURE FOR FIRSTOPERATION AFTER REPAIR.NOTE: If the AC voltage is less than 25 volt,.use the No AC Voltage test sequence chart.A separate section for troubleshooting problems withthe generator mounted control panel, automaticstart/stop system, follows theGENERATOR/REGULATOR test procedures.54
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