Weifang 495 - Electrical System; Battery; Dynamo

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and

the

pump

housing

should

be'

of

o.

2-

o.

7mm,

while

the

clear-

ance.

between

the

back

end

of

the

impeller

and

the

bedplate

should

be

of

0.4-0.

8mm.

7.

Electrical

System

The

electrical

system

of

the

model

495

diesel

engine

i'::cludes

mainly

the

bettery,

staring

motor,

generator,

regulator,

instru-

ments

and

switches,

etc.

The

cable

is

of

single

wire

syste1l1

with

one

pole

grounded

as

shown

in

Fig.

32.

1).

Construction

Features

of

The

Electrical

System

(1

)Battery

The

battery

is

of

Model> 6 - Q -

140,

its

rated

voltage

is 12

volts.

Each

cell

of

the

battery

is

fitted

with

21

pieces

of

pole

plant.

The

battery

capacity

is

140

amperes.

The

_

condition

of

battery,

which

affects

the

engine

'staring

di-

rectly,

should

always

be

kept

will

through

regular

maintenance

as

specified.

,

(2)Dynamo

:The model

of

2JF

-

200

silicon

rectified

dynamo

of

completely

enclosed

type

is

adopted

in

-the

engine.

The

operating

voltage

is 14

volts

,the

output

current

is 13·

amperes

and

the-

rated

capacity

is-

180

watts.

The

silicon

rectified

generator

is a

set

of

small.

size

,sim'-

pIe

constructioQ

and

good

charging

performan~e

at

low

speed·,~tc

...

The

-magnetic

'poles

of

the

generator

are

located

on

the

rotor

and

the

exciting

current

is

conducted

to

the

magnetic

field coil

through

two

slip

rings.

,-;'~

The

3-

phase

windings

are

located

on

the

stator

and

the

cur-

-

rent

from

the

windings

is

turned

into

DC

and

conducted

out

after

being

rectified

by

two

groups

of

silicon

diodes

(there

are

3

diodes

in

each

group

)

in

the

rectifyin-g

device.

74

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