Westerbeke 6.5KW - Page 98

to the positive marked terminal on the rectifier and the negative
(-) lead from the field coils is connected to the opposite
UNMARKED terminal on the rectifier. Using jumper leads with insu-
lated alligator clips, connect 6 to 12 volts DC battery positive
to the positive of the rectifier and negative to the UNMARKED ter-
minal of the rectifier for approximately 10 seconds. This should
restore magnetism to the stationary field coils. (Be careful not
to connect DC voltage to the AC terminals on the rectifier, as
this will damage the rectifier.)
Remove the alligator clip connections1 replace the end bell cover
and operate the generator and check AC output voltage.
6. Check for a short or open in the rotating armature or in the sta-
tionary field coils.
ROTATING ARMATURE (RESISTANCE VALUES)
TWG 6.5KW, 8KW, 11KW 1 ohm or less between slip rings (1 & 3)
and (2
& 4).
NOTE: 3- and 4-wire units: There should be no continuity found
between slip rings (1 & 2), (2 & 3) and (3 & 4). If continuity is
found, an internal short exists between these windings and the
armature should be replaced.
NOTE: All units: There should be no continuity found between any
of the slip rings and the armature's central steel shaft. If con-
tinuity is found, the windings are shorted to the shaft and the
armature should be replaced.
Rotating armature slip rings are numbered from inboard of the
generator flywheel end outward to the rear support bearing.
When referring to 2, 3 and 4-wire units, these are the number of
generator output leads being connected to the load. You will find
on the 11.0 and 12. 5KW units that there are 8 leads coming from
the brush rig and are combined for a total of 4 output leads. The
number
of wires can also be related to the number of slip rings on
the rotating armature.
FIELD COIL RESISTANCE (TOTAL)
TWG6.5KW
TWG8KW
TWG 11KW
22.2 ohms
22.2 ohms
14.2 ohms
92
± 5%
± 5%
± 5%