motor starter for conveyor

[formach]

hello guys...

im now doing motor starter for conveyor..so i decide to use 4 magnetic contactor connected with overload relay each..1 contactor for main supply and i make some looping for other 3 contactor each contactor connected to one conveyor... it is 3 phase and 2 poles overload relay..im having some problem on the on/off switch button..right now if im using push button..so everytime i wanna on the conveyor i have to hold it to make sure its keep running..my problem is my boss want me to use different on/off button which mean 1 button on and 1 button off...so i cant figure out how the connection...plus i add one master switch...how can i make it happen?? i try to google the solution but still cant find any solution...so anyone reading this hope can help me..thank you

 

[Bobster]

Search for a DOL starter, from what you've said I don't think your competent enough to be carrying this kind of work out.

 

[Knobhead]

Sorry but I agree with Rob. If you don’t have the competence to wire a simple retaining circuit you shouldn’t be undertaking this work. For this reason I will not help with drawings, or the like.
Remember a mistake by you could result in death!

Where in the world are you?

 

[Des 56]

Its a shame this thread wasn't made at the same time as the comments in another thread, which stated that this sort of thing doen't happen in industrial

It maybe time for a rethink in this thread http://www.electriciansforums.net/e...rum/63117-connectors-lighting-circuits-3.html PARA 3

 

[Guest123]

It really isn't as simple as you suggest, you need to be very careful here as there are a raft of statutory documents which apply to industrial situations that could see you in a whole heap of bother should the brown stuff hit the fan.

For that reason, I'm out

 

[Guest22]

Isn`t this rather simple? Its simple to make a circuit to make a contactor hold in.

 

[Bobster]

Isn`t this rather simple? Its simple to make a circuit to make a contactor hold in.

Not quite the point.

 

[Knobhead]

Isn`t this rather simple? Its simple to make a circuit to make a contactor hold in.

Emergency stops, overloads, phase reversal, sequence and more, all could come in play. Added to which we don’t know the location of the OP, I would suspect India so local codes would be in place.

I would suggest the OP asks his question at http://dgmsindia.in

 

[Guest22]

Well yes that included, of course i was just thinking i could make a contactor hold-in is all.

 

[Bobster]

Well yes that included, of course i was just thinking i could make a contactor hold-in is all.

Most people with baisic DIY skills could wire a house, doesn't mean it's right or safe.

 

[Guest22]

Most people with baisic DIY skills could wire a house, doesn't mean it's right or safe.

Not sure what you are getting at, I was saying its seems rather simple that was all.

 

[Bobster]

Not sure what you are getting at, I was saying its seems rather simple that was all.

The origional question has a simple answer, anyone with even a 5 week course will be able to wire a DOL starter and get it to work. In an industrial environment the same with domestic there are other things to consider that doesn't make the job so simple. Take wiring a conveyor belt in the uk, an emergency stop circuit with pull wires will need to be installed, interlocking with other belts will need to be wired in. There isn't a simple answer without seeing his situation. The comment you made about it being easy to get a contactor to latch being easy is correct, but it might not be safe given certain circumstances, and with the OP not knowing how to wire this up, I was making the assumption that the OP might not be competent in wiring such a system up to be safe.

 

[Deleted member 26818]

Was not aware that pull wires are required.
When did that come in?

 

[Bobster]

Was not aware that pull wires are required.When did that come in?

Sorry, had a few beers tonight and a little grumpy. Not sure if they are a legal requirement but are definatly a specification the company I work for insists in every one of their quarrys.

 

[Deleted member 26818]

I suppose it's horses for courses.
I suppose if you have a conveyor moving great big rocks to a rock crushing machine, you'd want as good a safety system as possible.
If it's a conveyor moving small componants across a factory floor, it's not such a big deal.

 

[Knobhead]

It's the small conveyors that cause the problems, people take them for granted.

I wouldn't contemplate a conveyor without pull switches.

 

[Deleted member 26818]

Tony, perhaps in the sort of work places you've worked in, pull cords are the norm.
Imagine the chaos if you had half a dozen workers picking from a conveyor.
Much better to have an indirect drive which will slip under too much load and push button 'E' stops at each work station.
Courses for horses.

 

[ian.settle1]

May be his boss wants to check his competentcy so he has come here to find out how to do it as he hasn't got a scooby doo.

 

[formach]

the motor using wye connection...from what i learnt wye connection have neutral wire...so i have to use neutral wire too? because without the neutral wire the conveyor still moving..

why conveyor got thermal control??

 

[Deleted member 26818]

Classic.