24v relay circuit - elp!

[cunnishaun]

...This auger is not going for re-sale onto any markets, it is used in house by operators...

Wade if you read my post I never used the term "sale".
The statute law regarding this defines putting onto the market as putting into use, whether this be internal to the company who made it or not.

If you are building a machine for use in an enterprise of any sort it must comply with the requirements of the relevant new approach directives,etc. and the UK statute law that applies, e.g. EAWR, PUWER98 etc.

It matters not one little bit that it is the company who is designing & building the thing that is going to use it, the law states that it still MUST meet the requirements.
If you & your employer choose to commit criminal offences then it's your shout, but you should be aware of what you are letting yourself in for.

Totally agree with this!! Would also like to add: emergency stops should not be wired through a plc, they should be wired through a safety relay ie piltz to stop the machine completely when pressed not just stop part of it!

 

[Spoon]

Would also like to add: emergency stops should not be wired through a plcQUOTE]

There are safety PLC's out there that can now be used along side ordinary PLC's in the same node. We use them on our controls.

Wade: We are not out to get you, just to give you some advice mate. If I was you I would leave the design of this down to someone else and you are doing a lot more than "to install a start stop circuit for an auger....all i am asking is how to integrate a 24v relay into that."
It is coming across that you are determined to do this project and I have to agree with Tony's post #30.

 

[wade88]

Woooooaahhhhh, lads, I don't think anyone is out to get me at all!!! I appreciate your input I haven't once said otherwise!!! Let's leave the mardy metaphors at home.

Look, I am not determined to have myself thrown in jail, nor determined to be sat in front of a judge for gross neglect resulting in manslaughter or whatever, there are still a few remaining boxes to be ticked on my lifes "to do list", rotting in prison is not one of them. Please don't mistake my bad sense of humour as being ungrateful for your input.

I don't want to stew in any juice thank you very much chaps!

Now i have listen to what you have said, and i will be regurgitating that same information to my boss and to do the machine builders who are pressuring me to do this and to every other bugger who is just expecting me to walk into this bear trap.

Thanks for the heads up guys thats why i posted to begin with and that is why i use this forum.

Can i get a troll badge like Biff please........

 

[wade88]

Ok so here we have the bits and pieces. The schneider box is what i have gone for, no EM stop, forward, reverse and stop functions. I also ordered 1 AC 24v mini relay contactor and 1 DC variant just incase, as i do not know what the signal command and a thermal overload.

Pictured also is the auger in question and its spec plate.

The aim as discussed and not to flog a stewing horse here...... :lipsrsealed2: .......... is to have this auger operating manually, and to also accept the 24v signal.

As we have all established, i do not know how to do this. Will not beat around that little bush, in my ignorance, i was hoping to include one of those mini contactors into the Schneider box upstream of the rest of the control gear.

This is all somewhat alien to me. It is not my area, their electrician will be present to assist but i also feel is trying to step away from any responsibility and just letting me hang.

 

[wade88]

The auger is going to be lifted up onto that big blue mixer where i will be welding the support legs onto it, it will then be feeding that ribbon mixer with the dry good that are manually loaded by the operator into the hopper just out the picture.

 

[SheffSimon]

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Ok so here we have the bits and pieces. The schneider box is what i have gone for, no EM stop, forward, reverse and stop functions. I also ordered 1 AC 24v mini relay contactor and 1 DC variant just incase, as i do not know what the signal command and a thermal overload.

Pictured also is the auger in question and its spec plate.

The aim as discussed and not to flog a stewing horse here...... :lipsrsealed2: .......... is to have this auger operating manually, and to also accept the 24v signal.

As we have all established, i do not know how to do this. Will not beat around that little bush, in my ignorance, i was hoping to include one of those mini contactors into the Schneider box upstream of the rest of the control gear.

This is all somewhat alien to me. It is not my area, their electrician will be present to assist but i also feel is trying to step away from any responsibility and just letting me hang.

Why no emergency stop? To have concluded that you must have done a risk assessment and concluded that any risks to human health were covered by mechanical guards etc and that nothing was left which required electrical controls reduce risk to a negligible level.

Dont be frightened off from doing a risk assessment, its a matter of looking at the process and equipment and first recording all the things which might injure a person - dont worry about equipment damage, thats not the purpose of the exercise. Then you attach a value to those risks - severity of injury, frequency of exposure, number of persons involved, likelyhood of occurence. You then set about reducing or eliminating the risks by designing out, mechanical guards etc. Emergency stop devices are the last option.

Then you're into required performance level of your circuits, and proving they meet that PL, which is the maths bit.

If you cant do the above, dont do what you are doing, get somebody else to do it. Legal requirements unfortunately, and any earlier posts recommending just wiring an estop in series with your stop pushbutton, are best ignored.

 

[wade88]

I'm getting a contact of mine in yea.

Few other issues to sort out around the place so will kill a few birds with one hand grenade.

I don't want any of this on my head.

 

[SheffSimon]

I'm getting a contact of mine in yea.

Few other issues to sort out around the place so will kill a few birds with one hand grenade.

I don't want any of this on my head.

Good choice, but still make sure its done properly and is documented.

 

[wade88]

Yea it will be.

Feel totally beaten this week. Too many things going wrong with machines and i just can't fix them. Outside my area of knowledge.

Going to have let the wife map read for a while so to speak and get some assistance.

Show me the beer. Jesus

 

[telectrix]

jesus was water into wine. beer was considered to be too bourgoise for the scibes and the pharisees.

 

[wade88]

Wine would suffice just fine. Hell, right now, im considering a walk to the lab to dig out the ethanol

 

[silva.foxx]

It may be an idea to get the correct rating of overload, at least protect the motor if not yourself and the contraption's users!

:devil:

 

[wade88]

That was the overload that came with it?!

 

[Knobhead]

Set the O/L to the motor FLC. Some people seem to think it should be 115%

 

[SheffSimon]

Set the O/L to the motor FLC. Some people seem to think it should be 115%

Easier said than done in this case...the motor is 0.48kW, the O/L bottom range is 2.6A...

Just for future ref Wade, do your design before you buy a load of bits.