motor control help

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lat1

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i'm doing my 3rd year apprentice course thru correspondence, and just started hitting the motor control part of the course. the book and workbook (rockis, mazur) seem to be asking questions that i cant answer by reading the text. the word Q's are alright but they start to ask me to draw different line diagrams, with standard lettering, and line reference,etc. they don't have many example's to check out. is there anywhere online to get a better grip on line diagrams?
 

tom baker

First Chief Moderator & NEC Expert
Staff member
Location
Bremerton, Washington
Occupation
Master Electrician
There is a great book by Sq D that is available as a free download, I have the book at home, and will send you the link to it in a few days
 

electricalperson

Senior Member
Location
massachusetts
an easy tip i learned early on before i became licenced, think of all the devices in a control circuit as a single pole switch. makes life easier. theres plenty of motor control books that can help you out.
 

Ken9876

Senior Member
Location
Jersey Shore
I have those books too, we never used the work book, however. The chapters about the general control logic and numbering were pretty good I thought. I'd say go back to the text and read it again, paying attention to the diagrams in the text book. Controls can be hard to learn, but just stick with it.
 

Poolside

Member
lat1 said:
i'm doing my 3rd year apprentice course thru correspondence, and just started hitting the motor control part of the course. the book and workbook (rockis, mazur) seem to be asking questions that i cant answer by reading the text. the word Q's are alright but they start to ask me to draw different line diagrams, with standard lettering, and line reference,etc. they don't have many example's to check out. is there anywhere online to get a better grip on line diagrams?


Did your book come with a CD? I use this book in my class, and the ones that we have came with a CD that had some good explanatory material, etc.

Also, you might want to check out the publisher's website (I don't have it on hand) but I think there might be additional material there, too.

If you study and work with it, you'll get it. Just remember it's all just switching.


- Greg
 

R Bob

Senior Member
Location
Chantilly, VA
electricalperson said:
an easy tip i learned early on before i became licenced, think of all the devices in a control circuit as a single pole switch. makes life easier. theres plenty of motor control books that can help you out.

Good advice!

Back when I first started learning controls, an old geezer continually reminded me that "it's nothing but a bunch of switches hooked together".
Initially seemed archaic and overly simplistic at the time but this approach has served me well over the years and I pass it on to others.

Many electricians open control panels and they are immediately overwhelmed buy the number of wires, terminals, relays and what have you. They raise the white flag and are defeated before they even begin.
Don't let this stuff intimidate you... it's nothing but a bunch of switches!

The old guy also passed on to me the prerequisite that "you must know how it(the control system) is supposed to work right(the sequence of operation) before you can fix it".
 

stevee

Member
Poolside said:
Did your book come with a CD? I use this book in my class, and the ones that we have came with a CD that had some good explanatory material, etc.

Also, you might want to check out the publisher's website (I don't have it on hand) but I think there might be additional material there, too.

If you study and work with it, you'll get it. Just remember it's all just switching.


- Greg

the website is go2atp.com, but your best resource is the CD the book came with. I'm pretty familiar with the book being used and I think it is an excellent reference.

Also, if you want to really get ahead try the program called "The Constructor." It's a very good ladder logic simulation program.

And if you are in your 3rd yr of an apprenticeship program your JW's on the job are an excellent source for info.

What apprenticeship program are you in?
 
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