Piper Lance II - Page 477

LANCE
II SERVICE
MANUAL
TABLE
XI-III.
ELECTRICAL
SYSTEM
TROUBLESHOOTING
(cont.)
Trouble
Cause
Remedy
ALTERNATOR
(cont.)
Field circuit
breaker
trips. (cont.)
Short circuit in field
winding of alternator.
Disconnect
field
wiring
at terminal of alter-
nator.
Turn on master
switch.
Reset breaker
and
if breaker
fails to
retrip, this isolates
short circuit
to field
of
alternator
it self.
Check
brush holders for
shorting
against
frame.
If there
are no
obvious
signs
of a physical
short circuit
at field
terminal
or
brush
holder, replace alter-
nator.
(Note:
Inter-
mittent
short
circuit.)
Internal short
circuiting
of the
field can
occur
at various
positions
of
the
rotor,
therefore,
reconnect
field, reset
breaker, pull propeller
slowly
by hand
turning
alternator
rotor
through
360
of travel.
Observe
circuit breaker for
signs
of
tripping.
CAUTION
Turn
magento
switch to
off before
turning
pro-
peller.
Issued: 1/3/78
ELECTRICAL SYSTEM
2H21