Direct online forwarding and reverse.

[Zaprinski]

Good morning again ,any Idea I looking for example cable sizing.
[automerge]1571565704[/automerge]

 

[Pete999]

Good morning again ,any Idea I looking for example cable sizing.View attachment 53253View attachment 53254
[automerge]1571565704[/automerge]

Iitle unfers you need help in DOL forward and Reverse of a motor

 

[Zaprinski]

Iitle unfers you need help in DOL forward and Reverse of a motor

I know , but I don’t like make new post .
I little be confused theory now , I not have proper book,Any idea where did I find examples test .
I’m ready too pay small amount ££££.
Pdf file .
Thank you .

 

[Spoon]

I know , but I don’t like make new post .
I little be confused theory now , I not have proper book,Any idea where did I find examples test .
I’m ready too pay small amount ££££.
Pdf file .
Thank you .

Hi mate.
It's best if you do new questions in a new post mate.
Also, if you are going to get into electrical design then you need to get the BS7161 book.

IET Wiring Regulations 18th Edition

#html-body [data-pb-style=THAG3L6]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll;border-style:none;border-width:1px;border-radius:0;margin:0 0 10px;padding:10px}#html-body...

www.test-meter.co.uk

Also, with questions like the above, we don't like giving out answers without you first attempting to do the question and showing us your workings-out. Then we can correct anything. It's the best way of learning.

 

[Baddegg]

It always looks intimidating @Zaprinski when it written like that but all the things you need are in bs 7671 just take your time and break the question down.....if you know your design current and installation method and relevant correction factors you can choose your cable and then you can calculate for volt drop, the more you do it the easier it gets...good luck

 

[Zaprinski]

Hi mate.
It's best if you do new questions in a new post mate.
Also, if you are going to get into electrical design then you need to get the BS7161 book.

IET Wiring Regulations 18th Edition

#html-body [data-pb-style=THAG3L6]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll;border-style:none;border-width:1px;border-radius:0;margin:0 0 10px;padding:10px}#html-body...

www.test-meter.co.uk

Also, with questions like the above, we don't like giving out answers without you first attempting to do the question and showing us your workings-out. Then we can correct anything. It's the best way of learning.

Ok I got book I try to work out and show you my home work .
Thank you for help .

 

[EricMark]

Most forward and reverse needs some time for the motor to stop. The circuit you have shown would allow the motor to be reversed with any time for it to stop first.

 

[Simon47]

Yes, I'd observed that. There should really be a N/C contact from each direction's contactor inhibiting the other direction's coil circuit. Wouldn't stop the operator hitting stop then reverse immediately - but it would stop them just hitting reverse.
Mind you, the mechanical interlock would deal with that - but IMO it would be poor design to be relying on that rather than designing the control circuit correctly.

 

[Zaprinski]

Yes, I'd observed that. There should really be a N/C contact from each direction's contactor inhibiting the other direction's coil circuit. Wouldn't stop the operator hitting stop then reverse immediately - but it would stop them just hitting reverse.
Mind you, the mechanical interlock would deal with that - but IMO it would be poor design to be relying on that rather than designing the control circuit correctly.

Thank you .

 

[Spoon]

Yes, I'd observed that. There should really be a N/C contact from each direction's contactor inhibiting the other direction's coil circuit.

There is. There is a N/C contact from the Reverse contactor in the Forward circuit and vice veras.

 

[Simon47]

Ah yes, so there is. Too late in the evening for my memory

 

[Zaprinski]

Ah yes, so there is. Too late in the evening for my memory

Never be late .?

 

[Spoon]

I think @Zaprinski wants to know about the question in his post #31 now, but didn't start a new thread so things are getting mixed up. I think he has sorted the starter question as he says he built it in his post #29.
For his question in post #31 he is getting the BS 7671 book and hopefully will attempt the question himself. We can then look at his results and correct anything. Always better to try yourself and then ask where you went wrong.

 

[Zaprinski]

I think @Zaprinski wants to know about the question in his post #31 now, but didn't start a new thread so things are getting mixed up. I think he has sorted the starter question as he says he built it in his post #29.
For his question in post #31 he is getting the BS 7671 book and hopefully will attempt the question himself. We can then look at his results and correct anything. Always better to try yourself and then ask where you went wrong.

All done forward and reversed for now .
Thank you .
Just need to help for theory now , I start assignment.
I understand quickly Cable size and Voltage drop .
I’m not Lazy , always try doing my self ?
But my first language not English??
I should me Jobs now ?
That I ask people help me for money?