Westerbeke 20B TWO Installationshandbuch PDF herunterladen (Seite 32)

ALTERNATORS

TESTING/TROUBLESHOOTING

50

AMP

TYPICAL

ALTERNATOR

#14

BROWN"".

~--

FROM

TACH

DESCRIPTION

CASE

GROUND

EXCITER

TERMINAL

~._..,~-~R

IJEFER

TO

mE

WIRING

DIAGRAM

IN

THIS

MANUAL

FOR

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

harness,

a mounted

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

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

alternators

produce a rated output of

50

or

51·

amps.

rated output

is

achieved

at approximately 6000 alternator

rpm

at

an

ambient

temperature of 75°F (23.8°C).

The

alternators

are

designed

to

opemte

in

an

ambient

tempemture

range of -40°

to

212°F (-40°

to

l00°C).

VOLTAGE

REGULATOR

The

integral 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

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

vibmtion.

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

run~

hot.

A

failed

alternator

can

become

very

hot.

Do

not

touch

the

alternator

until

if

has

cooled.

LOW

BAITERY

/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

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

terminals, connectors

and

plugs

are

clean

and

tight.

Loose or corroded 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

th~

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

~attery

selector switch

is

usually mounted

in

the

circuit

to

isolate

the

batteries so

the

starting 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

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