Generator Output; Rotating Auxillary Winding - Westerbeke 6.5 MCG Service Manual

BC GENERATOR SINGLE PHASE
GENERATOR OUTPUT
To confirm the generator's output capacity, run the
generator first with no-load, then at half capacity, and
finally load it to full capacity (indicated on the
generators data plate). Voltage and load can be
monitored using a portable meter and amp probe.
The output should be checked periodically to ensure
proper operation of the generator and the appliances
it
supplies.
ROTATING FIELD/AUXILIARY WINDINGS
WINDINGS
WINDINGS
'I\vo sets of windingS
are
found in the rotor assembly. An AC
voltage is produced in two groups of windings as the rotor
turns
at its rated rpm. This AC voltage passes through each
of the two diodes mounted on the isolated fixture just before
the rotor carrier bearing. The AC sine wave is changed to DC
and this DC voltage is passed through the two groups of
rotating field windings producing a DC field around these
windings. This field affects the
AC
winding of the two main
stator groups inducing an AC voltage in these windings that
is available at the
AC
terminal block connections.
AC CIRCUIT BREAKER
An AC circuit breaker is installed on all single phase
generators. This AC circuit breaker will automatically
disconnect the generators output from the vessel's AC
load in the event of
an
amperage overload. In the event
of an AC breaker trippingm it must be manually reset.
The AC breaker can be manuaUy opened wheri
servicing the generator/engine to ensure no AC
voltage is sent to the vessel's distribution panel
when operating the unit.
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INTRODUCTION TO TROUBLESHOOTING
·-
The following. teSt procedures
ctm
be
us~
to troubleshoot·
WESTERBEKE:'S 4 POLE DUAL EXCITER CIRCUIT
BRUSHLESS GENERATORS. Due to the simplicity of. the
generator, troubleshooting i~ relatively easy. ·
Field testing and repairing can'be accomplished With basis
tools
and repair parts which, siJould include the following:
A quality multimeter (mul,titester) capable ofreading less
than one ohm and with a ipecific diode testing function.
Basic electrlcal toolS
blcludin~
cutters, soldering iron, wire
strapPer/crimper, terminal connectors, etc. . ·
Repair parts such as diodes, fuses, bridge. rectifier, etc.
PRELIMINARY CHECKING
Before electrical testing, check for proper engine speed/hertz
adjustment
Low
engine speed will cause low
AC
voltage
output, high engine speed-high
AC
output.
Refer to .WESTERBEKE'S operators manual or service man-
ual for engine. speed/hertz adjustment or for other possible
engine related problems.
Before testing, get a clear explanation of the problem that
exists, be certain it relates to generator components.