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00:00:07

welcome you to our channel today

00:00:09

we will learn how to repair such a

00:00:12

contactor called MT-25 10,

00:00:16

this small-sized contactor is designed

00:00:19

for a current of up to 25 amperes,

00:00:23

its coil is 220 volts,

00:00:27

first of all we need to ring

00:00:29

the contacts, these

00:00:32

first three pairs of contacts with

00:00:36

23 this is power, you have 3 contacts, but this one

00:00:40

here is 4 contacts, it is additional, it is not

00:00:42

as powerful as all the others, we will

00:00:45

now analyze it and see how this

00:00:47

contact differs from these,

00:00:50

in order to diagnose a malfunction

00:00:52

of the contactors, first of all, we need to

00:00:54

ring the contactor,

00:00:57

we will ring the contacts in pairs so the

00:01:00

first contact

00:01:02

is serviceable, 2

00:01:05

serviceable people are

00:01:08

serviceable and 4 are

00:01:11

serviceable.

00:01:13

Now we can ring the

00:01:17

electromagnet coil, or

00:01:18

rather, not ring it, but find out its

00:01:21

resistance.

00:01:22

I switched the multimeter to measuring

00:01:25

resistance and we will

00:01:28

measure the resistance of the coil,

00:01:30

so resistance 370 is the normal

00:01:34

resistance for a 220 volt coil

00:01:37

for comparison. I’ll now show you the

00:01:41

resistance of contactors with a

00:01:45

380 volt coil, you

00:01:47

see its resistance is much

00:01:49

greater than 220,

00:01:53

we’ve made sure that our contacts are working properly

00:01:56

and our coil is working properly, we’ll

00:02:00

start disassembling our contactor, we

00:02:03

can remove these plastic covers,

00:02:05

they will only get in our way now

00:02:20

[ music]

00:02:23

let's start disassembling the contactor here

00:02:27

there are some screws that are not immediately

00:02:28

noticeable but they will help us disassemble

00:02:32

the contracts almost 100 points

00:02:35

let's start disassembling

00:02:44

here

00:02:48

[applause]

00:02:56

as we see the contactor has been disassembled but the two

00:02:59

halves will start from the bottom first

00:03:03

so the

00:03:05

electromagnet coil we have already

00:03:07

rang it but it has one more

00:03:10

contact, this is also a contact, and two it

00:03:13

duplicates this contact and they are

00:03:15

electrically connected inside, so we

00:03:18

can use at least this contact,

00:03:20

even this one, it doesn’t matter if

00:03:23

we rang the coil, the potatoes are

00:03:25

working properly and we

00:03:27

’ll see what’s here below,

00:03:30

this here is the lower part, the stationary

00:03:34

part of the magnetic circuit,

00:03:36

it lies at the bottom

00:03:39

on a rubber backing,

00:03:42

this rubber backing is made to

00:03:45

reduce humming and vibration,

00:03:52

here are the things on the magnetic circuit, they are

00:03:56

also needed to reduce vibration, if you

00:03:59

remove them, then our contactor will hum

00:04:01

stronger,

00:04:04

let's now see what is in the upper part of the

00:04:07

upper parts there is a

00:04:09

moving part of the magnetic circuit which is

00:04:12

called moving now we will try to

00:04:15

get it out of there

00:04:16

to get the armature along with the contacts

00:04:19

we need to unscrew these screws on the

00:04:23

terminals they need to be unscrewed

00:04:26

almost to the end leaving the screw on the

00:04:28

last turn this is because these

00:04:32

screws not only secure the wires

00:04:34

terminals, but they also fix

00:04:38

the terminals themselves in the case,

00:04:46

we unscrew them and

00:05:07

now we can completely pull our contacts

00:05:11

out of the case

00:05:15

about 1 we do 2

00:05:20

3

00:05:22

4 the vision of the knife is different

00:05:26

now on the other side

00:05:39

these are fixed contacts, each contact

00:05:42

consists of such a plate, it is

00:05:45

fixed to it the contract, as we see, it is a

00:05:47

rivet, it is made of copper,

00:05:56

this little white contact is an

00:05:58

additional contact, but these are the

00:06:00

main power contacts, but don’t you see

00:06:02

a little larger

00:06:05

and we distinguish and differ in color,

00:06:09

we pulled out the contacts, now we can

00:06:12

easily remove the top part and now we

00:06:14

have seen the moving contacts are

00:06:17

attached to this

00:06:19

plastic traverse and now we can

00:06:22

take a good look at them,

00:06:24

these first three contacts, one-two-three,

00:06:28

these are the power contacts that

00:06:30

can withstand 25 amperes, but this

00:06:34

fourth contact, this additional

00:06:36

one, which we call 13 14, is not

00:06:40

Its power design is made so

00:06:43

that the contact itself, together with the spring,

00:06:45

can be moved downwards and thus

00:06:48

our contact will become not normally

00:06:50

open but normally closed. Now the

00:06:54

fixed contact

00:06:57

contacts the moving contact like this if we

00:07:00

move this VKontakte upside down and

00:07:02

move the spring downwards. Let's

00:07:04

also turn this contact 180 degrees,

00:07:07

then we will turn this contact into a

00:07:09

normally closed contact. This

00:07:11

contact is needed in some

00:07:13

control circuits, for example in vr or in

00:07:15

reversing starters, but now we do

00:07:18

n’t need this and we will leave it so we

00:07:22

can check all the contacts,

00:07:24

you will make sure their frequency, if the contacts are

00:07:27

dirty, then we need to clean them,

00:07:29

some advise cleaning them with sandpaper

00:07:32

or other abrasive materials, but I do

00:07:34

not advise you to do this because the sandpaper

00:07:37

will leave behind pieces of the

00:07:40

abrasive material itself, which

00:07:42

will disrupt the contact and can ruin the

00:07:44

contact surface, the

00:07:46

contact surface should be as smoother so

00:07:48

that

00:07:50

the contacts touch each other with as

00:07:53

much surface as possible in order to

00:07:55

transmit as much current as possible, but if

00:07:57

the contacts are uneven or scratched,

00:08:01

contact

00:08:03

will deteriorate and

00:08:04

our contactor will most likely become unusable,

00:08:10

I would advise you to clean the contacts with

00:08:11

some kind of needle file, preferably a

00:08:13

diamond file or a nail file for nails,

00:08:16

you can also clean the contacts with a rubber

00:08:18

eraser or a piece of leather, it is important that

00:08:21

the contact remains even and

00:08:24

very smooth, some electricians

00:08:27

polish the contracts with a needle,

00:08:30

then this will be an ideal contact,

00:08:34

so we made sure that everything is

00:08:36

fine here, we checked that the contacts are clean and

00:08:39

now we can collect everything back

00:08:42

to assemble the contact group, you

00:08:47

need to insert its upper half, you need to

00:08:50

decide where the contactor is up and where the

00:08:53

bottom is, from the inscriptions you can understand that up is

00:08:55

here, which means we will insert

00:08:58

the traverse like this,

00:09:06

now we need to install

00:09:09

these contacts back, making sure that they are clean,

00:09:14

[ __ ] this one a washer so that

00:09:16

you can insert the wiring here and

00:09:19

insert our contacts;

00:09:23

they are inserted tightly and therefore

00:09:26

we won’t be able to insert them by hand

00:09:32

first, we’ll just direct them

00:09:39

to 13.

00:09:40

You insert this little white

00:09:41

contact, it’s weaker and is just

00:09:44

intended for this place, although the

00:09:48

contacts are interchangeable if you have

00:09:51

there is some problem, you can

00:09:53

always replace it, take

00:09:55

this contact from another contactor and

00:09:57

put it here and everything will work fine

00:10:01

push the contacts all the way

00:10:07

and now they can be screwed in when

00:10:10

you screw this answer the

00:10:12

contacts are fixed in place and

00:10:15

this screw from the bottom side they go into

00:10:19

their hole and now it will be possible to

00:10:22

release the tractors in

00:10:26

exactly the same way, we take the other side 13

00:10:31

and 14, we take a weak contact, we

00:10:35

add

00:10:37

the rest, we insert the contacts, the power

00:10:57

ceilings

00:11:07

can not be screwed in completely because

00:11:10

we will still need to

00:11:11

insert wires

00:11:19

of this kind here someday the position will be in this

00:11:23

position, the

00:11:24

halves of the contactor are fastened with

00:11:27

these screws, the screws

00:11:29

are screwed into space, which of course

00:11:31

tells us that these contactors are most

00:11:34

likely disposable than reusable when

00:11:37

we unscrew them several times and tighten them,

00:11:39

the thread here can easily curl up if we

00:11:44

take the old Soviet one as an example

00:11:45

contactor, then it is tightened with

00:11:50

real screws,

00:11:52

they are screws, and

00:11:56

real brass nuts are pressed into the housing, which tells

00:12:00

us that this contact with can be

00:12:02

disassembled more often with old contactors, I

00:12:05

just noticed, look

00:12:08

here there are in the terminals these are the risks

00:12:11

they are needed in order

00:12:14

to it’s better to fix the

00:12:16

wire as the one that will be clamped into the

00:12:19

terminal,

00:12:20

if we compare with this contactor,

00:12:23

then there are no such scaffoldings here, this means

00:12:26

that these contactors were still

00:12:28

made by engineers who thought more about

00:12:32

reliability,

00:12:34

we are looking for the top and bottom, I carry the contactor, oh

00:12:37

here there where this latch is located here, you

00:12:41

can also find it up by the location of

00:12:44

this place where

00:12:47

exactly 2

00:12:49

contacts will be inserted, if we put it like this, it wo

00:12:52

n’t fit, it means up here, so we

00:12:57

installed the electromagnet coil so

00:12:59

that we don’t have

00:13:01

any dirt here and if we have

00:13:04

any left here there is some dirt or

00:13:06

dust or even sticks if chewing gum then

00:13:09

our contactor will hum and

00:13:11

sooner someday it will fail

00:13:14

down we collected up we collected now

00:13:18

we install this spring here

00:13:21

this return spring it returns the

00:13:24

armature when we remove the voltage from

00:13:27

electromagnet coils

00:13:29

and assemble our contactors,

00:13:32

tighten the fastening screws

00:13:35

[applause]

00:13:39

on one side and the other

00:13:42

[applause]

00:13:46

put on these plastic covers,

00:13:52

respectively, the top one on which it

00:13:54

says

00:13:55

1 and 2, the

00:14:00

bottom one on which only 2 is written,

00:14:09

and for the plastic pads

00:14:18

all our contactor is proven and assembled,

00:14:21

now we can install and

00:14:23

connect it, I’ll tell you another life hack

00:14:27

if you already have some wires connected here

00:14:29

and your contactor is already included in

00:14:32

some circuit and you suddenly discovered that

00:14:36

your coil is faulty, then you

00:14:39

won’t need to change the coil at all

00:14:42

To connect these wires, just

00:14:44

unscrew them and these 2 screws and the

00:14:47

top cover can be removed along with the

00:14:49

wires and you can easily replace the

00:14:51

coil and then put everything back in

00:14:54

place, that’s all for today, thank you for

00:14:57

your attention, subscribe to our channel,

00:14:59

write comments and likes, good luck

00:15:02

to you

Description:

#пускатель #контактор #ремонт В видеоуроке показываем, как легко выявить неисправности контактора, прозвонить контакты, замерить сопротивление катушки электромагнита, разобрать и собрать устройство.

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