Westerbeke 12C- TWO User Manual

ALTERNATORS- TESTINGJTROUBLESHOOTING
TYPICAL 50 AMP
ALTERNATOR
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VOLTAGE REGULATOR
The integra! voltage regulator is an electronic switching
device which senses the system voltage level and switches
the voltage applied to the field in order to maintain it proper
. system voltage.
The regulator design utilizes all-silicon semi conductors and
. thick~film assembly techniques. After the voltage has been
'~..j;EiiiniNi\L adjusted to the proper regulating valve, the entire circuit is
, encapsulated to protect the circuit and the components from
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TO R TERMINAL-
DESCRIPTION
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. MANUALFOR ALL
. WIRING CONNECTIONS
The following information applies to the standard alternators'
that are supplied with WESTERBEKE'S Engines_ and
Generators.
ELECTRICAL CHARGING CIRCUIT
The charging system consists of an alternator with a voltage
regulator, an engine DC wiring hamess, a mouuted DC
circuit breaker and a battery with connecting cables. Because
of the use of integrated circuits (IC's), the electronic voltage
regulator is very compact and is mounted internally or on the
back of the alternator.
It is desirable to test the charging system (alternator and
voltage regulator) using the wiring hamess and electrical
loads that are a permanent part of the system and will then
provide the technician with an operational test of the
charging system as well as the major components of the
electrical system.
ALTERNATOR. DESCRIPTION
The stator is connected to a three-phase, full-wave bridge
rectifier package which contains six diodes. The bridge
converts the AC generated in the stator to a DC output for
battery charging and accessories,
Power to the regulator and the field of the integral regulator
alternator is provided by the field diode (or diode trio)
package contained in the alternator.
These alternators produce a rated output of 50 or 51 amps.
rated output is achieved at approxiroately 6000 alternator
rpm at an ambient temperatnre of 75°P (23.S°C). The
alternators are designed to operate in an ambient temperatnre
range of _40° to 212°P (-40° to 100°C).
possible damage due to handling or vibration.
ALTERNATOR TROUBLESHOOTING
Use this troubleshooting section to determine if a problem
exists with the charging circuit or with the alternator. If it is
determined that the alternateir or voltage regulator is faulty,
have a qualified technician check it.
A WARNING: A working alternator run~ hot. A failed
altemator can become very hot. 00 not touch the
altemator until If has cooled.
LOW BATTERY/FAULTY CIRCUIT
If the starter only moans or makes a clicking sound instead
of
spinning the engine to life it is likely a low battery or a
faulty connection in the starting circuit and not an alternator
problem.
PRELIMINARY INSPECTION
Before starting the actnal alternator and voltage.regulator,
testing the following checks are recommended. •
1. Make certain your alternator is securely mounted.
2. Check the drive belts for proper tension. Replace the belt
if it is worn or glazed.
3. Check that all tennlnals, connectors and plugs are clean
and tight. Loose or corroded connections cause high
resistance and this conld cause overcharging,
undercharging or damage to the charging system. Badly
corroded battery cables could prevent the battery from
reaching a fully charged condition.
4. Check the condition of the battery and charge if necessary.
A low or discharged battery may cause false or misleading ..
readings in the tests.
NOTE: An isolator with a diode, a solenoid, or a battery
selector switch is usually mounted in the circuit to isolate
the batteries so the starling battery is not discharged along
with the house batteries. If the isolator is charging the
starting battery but not the house battery, the alternator is
OK and the problem is in the battery charging circuit.
Engines & Generators
25

Westerbeke 12C- TWO Specifications

General

Brand	Westerbeke
Model	12C- TWO
Category	Engine
Language	English