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BC GENERATORS TROUBLESHOOTING
TESTING THE EXCITER WINDINGS
AC voltage can be measured across the capacitor electrical
connections while the generator is operating. This voltage
may be as high as 350 to 400 volts
AC.
This
AC
voltage build-up is accomplished as the exciter
winding for each capacitor charges the capacitor and the
capacitor discharges back into the winding.
This
flow of
saturating
AC
in the exciter winding produces a phase-
imbalance type of filed that affects the auxiliary windings
of the rotor:
·
The
AC
voltage reading is taken between the two electrical
coMections on each separate capacitor with the generator
operating at its correct no load speed.
EXCITER WINDING INTEGRITY (RESIDUAL AC VOLTAGE)
The condition of each exciter winding can
be
determined
by the residual
AC
voltage each exciter winding should be
producing with the generator ruMing at proper no load speed.
To do this: Unplug all coMections from the capacitor. Locate
the electrical cOMection for each winding end. Place your ·
AC
volt meter coMects across these two coMections. Start
the generator and observe the residual
AC
voltage produced
by the winding. Check the other exciter winding in the same
way. Residual
AC
voltage lower than listed below will
indicate a faulty winding.
RESIDUAL VOLiAGE
(EACH WINDING GROUP)
MEASURED BETWEEN #50 AND
#9
OF EACH GROUP
7-9 VOLTS AC.
TESTING WINDING LEADS
FOR NO CONTINUITY
· TO METAL CASE
THERE SHOULD BE NO
CONTINUIIY BETWEEN LEADS
50HZ AND 19 TO CASE
GROUNDS
MEASURING VOLTAGE
GENERATOR RUNNING
SET THE METER DIAL
ATAC VOLTS
50Hz 60Hz
~
.
MAIN STATOR WINDING RESISTANCE
LESS THAN ONE OHM FOR EACH WINDING GROUP
MAIN STATOR RESIDUAL VOLTAGE
LINE TO NEUTRAL 4-6 AC VOLTS
(THIS INDICATES GOOD STATOR WINDINGS)
/Engines & Generators
73
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