Figure 11-2 lamp Bank Load
The alternator system does not require a reverse current relay, because of the high back resistance of the
diodes and the inability of the alternator to draw current or motorize. A current regulator is unnecessary because
the windings have been designed to limit the maximum current available. Therefore, the voltage control is the
only control needed.
There is a circuit breaker which control the generating system.marked "Alternator Field." the breaker is to
protect the alternator and electrical system from overload. The circuit breaker is for the voltage regulator and
alternator field. If the the field circuit breaker trips, it will result in a complete shut down of power from the
generating system. After a one or two minute cool down period, the breaker can be reset manually. If tripping
reoccurs, this indicates a short in the alternator circuit.
The ammeter does not indicate battery discharge, but displays the load in amperes placed on the generating
system. With all electrical equipment off, except the master switch, the ammeter will indicate the amount of
charging current demanded by the battery. This amount will vary depending on the percent of charge in the
battery at the time. As the battery becomes charged the amount of current displayed on the ammeter will reduce
to approximately two amperes. The amount of current shown on the ammeter will tell immediately whether or
not the alternator system is operating normally, if the following example is kept in mind.
2612
60 - AMPERE ALTERNATOR
(8) 8A. LANDING LIGHTS
ALLIGATOR CLIPS
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
ELECTRICAL SYSTEM
2C22
