TROUBLESHOOTING
TESTING AND ADJUSTING
POSSIBLE CAUSES
VERIFICATION PROCEDURE
48. Rotor Winding (L5) Defect
If generator voltage goes low again and again. or only when generator
gets to normal temperature for operation. rotor field (L5 )
could be the cause.
If exciter field (L3) current at no load, rated voltage and frequency
is more than rated no load current by 60c, the exciter field ( L3).
exciter armature (L4). or the rotor field (L5) windings could be
defective. If Verification Procedure ,=5 shows no defect. the main
rotor 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 ELECTRICAL
MECHANICAL CHARACTERISTICS.
NOTE: A small change in power factor will change the field current
necessary to give rated voltage. An increase in the power factor
of 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. Measure
the field current. To find acceptable field current for load
conditions other than rated, contact CATERPILLAR TRACTOR CO.
71
