Wiring Diagram

Question 1

We have a tage attached to the cable of the motor with M142(one frothy two) mentioned on it.

Question 2

ETC: Et cetera

Answer 2

و غيره

Question 3

Now the question here is that where this cable is connected in the machine electrical panel,and how dose the PLC controling tis motor.

Question 4

If we see the sheet of the electrical wiring diagram,every sheet has a unique number mentioned on the right bottom corner of the page

Question 5

The next thing you can see at the top of the sheet,this sheet is divided into some vertical colums,starting from column numbers 0 all the way up to column number nine.

Question 6

If you see the left side of the sheet it is divided in some horizontal rows starting from a,b,c and up to f.this rows and columns together make a grid on the sheet.this grid makes it easier to locate objects on this sheet

Question 7

So before going into electrical wiring diagram,we should know the basic symbols of the electrical devices like push bottoms,contactors,power supply and ETC.

Question 8

In the all of the drawing there will be few sheets showing all the items and the devices used in the project along with their symbols.

Question 9

We will see now how can trace back the wiring of this motor.

Question 10

How we can find out this motor on this electrical diagram that consists of several page.

Question 11

As you can see this motor is a three phasemotor and it’s wires are connected to the terminalstrip.inside the electrical panel,you can see that the three wires U142,V142,W142 are connected at u ,v,w output terminals of the VFD,so this motor M142 is driven by omron VFD and VFD tag is xx

Question 12

If you look at the top of the sheet,here you will see three lines,this three lines are the symbols for the three phase power supply,from here the three power fed into the QF142 breaker

Question 13

VFDs notmally requires a run command signal from the PLC to turn on the motor .

Question 14

This terminal receives a run command signal from PLC ,if you see closely this signal is coming from the normal open contact of the relay KA369

Question 15

To find out this relay we have to see the first two digits of the tag KA369

Question 16

This is theKA369 symbol for this relay coil,it look like a rectangular box.

Question 17

You can see that one end of the coil is connected to the zero volts line.and other end of the coil is connected to the number seven terminal of the PLC output card,number 7 terminal is the A05 output of the PLC,and it is mentioned here as glue pump start command.

Question 18

FR andFC arethe analog input of the VFD,if you see the drawing ,these two wires have tag 5210,and 5211 and this wires or lines have an arrow symbol at the starting point ,52.2 is mentioned near to these arrows.what does this mean?this mean that these wires are coming from the sheet 52

Question 19

From these terminal block, we move on to a three pole circuit breaker with thermal and short circuit protection capability.

Question 20

After closing this circuit breaker manually, the power flows toward some power distributer bars,from which some branches can be taken.

Question 21

One of the branches goes into a two-pole circuit breaker

Question 22

Wire tages are the combination of some letters and numbers installed on the wire or cable and are used to show you to wich device or terminal block a wire or a cable should be connected.

Answer 22

مي توانيد به راحتي به نمودار سيم كشي نگاه كنيد و بفهميد كه كجا بايد دوباره وصل شود.

Question 23

For instance, the main three-phase power is shown with some arrows and numbers on the top right-hand side of the page.

Answer 23

به عنوان مثال، برق سه فاز اصلی با تعدادی فلش و اعداد در سمت راست بالای صفحه نشان داده شده است.

Question 24

And how do I know that?! If you have seen the legend and abbreviation page of the drawing you know that the “-KA” is a nomenclature for a relay in this drawing.

Answer 24

nomenclature: نامگذاري

Question 25

Below the coil, you see the 13-14 contact (NO Contact) of page two and also the other NO and NC contacts of this relay with the addresses they have been used in this drawing.

Question 26

From there, we have extended this voltage using some terminal blocks so that we can deliver the power to different instruments, PLC cards, PLC CPU, or whatever device which needs 24 volts to power on

Question 27

In the following, we have a branch that delivers the 24 volts power to page 12 column zero, but with two interlocks!

Answer 27

در ادامه یک انشعاب داریم که برق 24 ولت را به صفحه 12 ستون صفر می رساند اما با دو اینترلاک!

Question 28

An interlock means a condition.
For example, here, without having those interlocks enabled, our 24 v cannot reach page 12, column 0.

Question 29

Let’s turn to page 130 of the wiring diagram again to see what those conditions are

Question 30

Did you notice that we have to get back and forth between different pages? This is the only way we have to take to fully understand these drawings.

Answer 30

آیا متوجه شده اید که ما باید بین صفحات مختلف رفت و آمد کنیم؟ این تنها راهی است که برای درک کامل این نقاشی ها باید در پیش بگیریم.
Forth: به پيش،جلو
Forth and back:جلو و عقب

Question 31

In fact, reading the datasheet of the equipment is a very important and inevitable stage of designing a wiring diagram

Answer 31

inevitable stage:مرحله اجتناب ناپذير