Westerbeke 6.5KW - Page 99

NOTE: There should be no continuity found between the field coils
and the generator body.
7. Replacement of Field Coil(s)
Field coils are connected in series and the reisitance value given
above in this text is the total of the four field coils. To
determine the resistance value of one, divide by four. Each field
coil has a mounting position on the generator housing and cannot
be interchanged with another field coil.
When installing a replacement field coil (s), the installer must
insure that the coil is correct for the mounting position in the
housing and will have the correct polarity when excited with 9 -
12 volts DC.
The field coil shoes that hold the coil securely to the generator
housing are held in palce by bolts that must be properly tightened
when the coil and shoe are installed to the generator housing.
When connecting the coils in series insure the butt connections
are good and secure and positioned away from rotating parts.
To insure the field coils have been posi tioned proper ly in the
generator housing and will have the correct polarity, the
following test must be made before reassembly of the generator.
(1) Connect a 9 - 12 volt DC battery
to the leads off the coils that
would normally be connected to
the (+) and (-) connectors of
the bridge rectifier. These
leads are unmarked and the
polari ty in their connection to
the DC battery is not important.
NOTE: When remov ing the leads
from the battery and recon-
necting them to the bridge rec-
tifier, you should maintain the
same polar i ty as used in this
test, plus lead to (+) on rec-
tifier and negative to unmarked
(-) connection on rectifier.
(2)
Wi th a 3 inch iron bolt or its
equivalent, place this bolt bet-
ween each adjoining field coil
shoe. It should be held in
place by the magnetic attraction
set up between the coil/shoes by
9-12
Volt Battery DC
the 9 - 12 volts excitation of the field coils. Should this
fail to happen between any of the four adjoining coils/shoes,
then an incorrect coil is installed and must be removed and
the correct one installed~ otherwise the generator when
assembled will not produce proper voltage.
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