LG GR-K18PBS Service Manual - Page 45

9-1-2.

Overload

protection

relay

(O.L.P)

structure

and

function

•

The

overload

protection

relay

cuts=the

power

to

protest

the

motor

when

the

temperature

of

the

compressor

rises

abnormal

when

the

overly

high

-cur

-rent

is

sent

to

the

-compressor

motor.

•

Overload

protection

relay

structure

is

composed

of

the

bi-nreldl

element

that

cuts

the

power

based

on

the

temperature

and

the

heater

that

heats

during

an

over

-current.

They

are

attached

to

the

external

surface

of

the

compressor

and

detects

the

temperature

of

the

compressor.

The

composing

circuit

is

connected

to

the

compressor

motor

in

direct

conriectin

-

When

the

overleadprotection

relay

-operates,

yeoman

hcrc_,.121tak"

seed

and

the

operation,aantactpoint

of

thezbi=Enetal

separates

from

the

fixed

contact

point.

When

the

heat

of

the

heater

is

reduced

or

when-the-temperat0re

of

the

siirripressor

IS

lOweract

altar

fl

-c

mini

itas,

the

bi-metal

oonnartS.

the

rimilit

with

another

"tak"

round

1-

n

nparate

the

compressor

Bi-metal

Operation

contact

point

PO

Base

(phenol

(a)

Internal

structure

Elertrir

-

rirritit

-

rtingram

Terminal

(Overload

relay

structure)

-11=14

,

-The-ever-lead-preteetion-relay-eleteets-and-eperates

by

both

the

temperature

and

the

current.

Therefore

even

when

the

power

is

not

connected,

it

can

still

operate

when

the

temperature

of-t14e-

ace

is

high

and

it

can

operate

when

there

is

an

over

-current

even

with

low

temperature

-on

the

surface

-But

even

though

this

will

not

happen

in

reality,

just

make

sure

that

the

relay

operates

-by

a-embinatien-of

abnormal

temperature

and

current.

(But

the

effect

from

the

-current

-is

-bigger

than

that

from

the

temperature.)

r

lire

overload

protection

relate

operates

and

it

recovers

aster

3-5

minutes

when

the

heat

is

lowerect

-

it

-

emperature

or

current's

-high.

In

other

words.

repeated

operation

for

several

hours

can

cAuse

a

onstomer

claim

At

this

timrsTartcquately

coot

the_

compressor

and

connect

the

power.

Also

there

is

a

case

when

the

relay

operates

but

recovers

-

kr

operate

-

again.

At

this

ime,

exchange

the

relay.

9,1.3-Starter4P.I.Oluncdonandoperating

principle

Tho

starter

i3

directly

-connected

-to

-the

-supplementary

coil

of

the

comprossor

to

accelerate

th

e-compresser-eperation.

It

is

internally

installed

within

the

-

externaFcasc-of

the

-

compre

like

the

overload

protection

relay.

Supplementary

Main

coi

he

starter

is

generallycomposetrof

P

T.G

material

u

the

F'

I

coil

past

there

were

ones'rn

relay

contact

porn

—

r

-

type

P.T.0

stanas

tor

Positive

i

emperature Coefficient,

referring

to

a

cesistanceihatImaa

constant

valuelildally

(ex

.

cl)

but

when

the

power

is

curinec;ted

the

resistance

-

becomes

infinite.

To

understand

the

role

of

the

starter

you

rnust

-

understa

operating

pnrrriplp

of

the

single

phase

mdi

iclive

motor

and

simple

AC

circuit

CR

Motor

circuit)

LG GR-K18PBS Service Manual - Page 45

Overload, protection, relay, O.L.P, structure, function, Bi-metal, Operation, contact, point,

Page 45 highlights