Piper COMANCHE PA-24-180 Service Manual page 546

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c. The regulator must be mounted in the operating position when electrical settings ar
checked and adjusted and it must be at operating temperature.
d. Specified eerator speeds for teting and adjusting.
1. Voltage Regulator
(a) Operating speed.
2. Curen Regulator
(a) All generates must be operated at a speed sufficient to produce current in excess
of specified setting.
(b) Voltage of the genertor must be Iept high enough to insure sufficient current out-
put, but below the operating voltage of the voltage regulator unit.
e. After any tests or adjustments the generator on the aircraft must be polarized after leads
are connected, but before the engine is started, a follows:
After reconnecting leada, momentarily connect a jumper lead between the "GEN" and
"BAT" terminals of the regulator. This allows a momentary surge of current to flow through the
generator which correctly polarizes it. Failure to do this may result in severe damage to the
equipment since reversed polarity causes vibration, acing, and burning of the relay contact points.
9-30. Cleaning Cntaect Points. The contact points of a reglator
will not operate indefinitely
without some attention. It has been found that a gat
majority of all regulator trouble can be
eliminated by a simple cleaning of the contact points, plus sane possible readjustment. The flat
points should be cleaned with a spoon or riffler file. On negative grounded regulatos which have
the flat contact point on the regulator armature, loosen the contact bracket mounting screws so
that the bracket can be tilted to one side. A flat file cannot be used successfully to clean the
flat contact points since it will not touch the center of the flat point where point wear is most apt
to occur. Never use emery cloth or
sndpaper
te clen the contact points. Remove all the oxides
from the contact points but note that it is not necessary to remove any cavity thdy mayhave
developed.
SPOON OR RILER
u
ELECTRICAL SYSTEM
ISSUED: 8/1872
3A24
PIPER COMANCHE SERVICE MANUAL