Westerbeke 12.0KW - 50Hz EDT Manuel d'installation télécharger pdf (Page 39)

ALTERNATORS

TESTING/TROUBLESHOOTING

4#100RANGEB

TO

STARTER

SOLENOID

DESCRIPTION

50

AMP

MITSUBISHI

ALTERNATOR

CASE

GROUND

REFER

TO

THE

WIRING

DIAGRAM

IN

THIS

MANUAL

FOR

AU

WIRING

CONNECTIONS

The

following

infonnation 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 harness, a mounted DC

circuit breaker

and a battery with connecting cables. Because

of

the use of integrated circuits

(I~'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 harness 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

altemators

produce a rated output

of

50 or

51

amps.

rated output

is

achieved at approximately 6000 alternator

rpm at

an

ambient temperature of 75°P (23.8°C). The

alternators

are

designed

to

operate in an ambient temperature

range

uf40°

to£!£"F-(

4eo,1O

leO°C).

VOLTAGE

REGULATOR

The integral

VOltage

regulator is

an

electronic

switching

device

which

sens~s

the system voltage level

and

switches

the voltage applied

to

the

field

in

order

to

maintain

a proper

system

voltage.

The regulator design

utilizes

all-silicon

semi

conductors

and

thick-film assembly

techniques.

After the

voltage

has

been

adjusted to the proper regulating valve, the

entire

circuit

is

encapsulated to protect the circuit and the

components

from

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 alternator or voltage regulator

is

faulty,

have a qualified technician check it.

A

WARNING:

A

working

alternator

runs

bot.

A

failed

alternator

can

become

very

bot.

Do

not

touch

the

alternator

until

if

bas

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

altemator

problem.

PRELIMINARY

INSPECTION

Before starting the

actual

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 tenninals, connectors

and

plugs

are

clean

and tight Loose or

corr~ed

connections

cause

high

resistance

and

this could 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

soleooid,

or a

battery

selector

switch

is

usually

mounted

in

the

circuit

to

isolate

the

batteries

so

the

starting

battery

is

oot

discharged

along

with

the

house

batteries.

If

the

isolator

is

charging

the

starting

battery

but

oot

the

house

battery,

the

altemator

is

OK

and

the

problem

is

in

the

battery

charging

circuit.

Engines & Generators

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