genny system

[Bernard1991]

hi i have a thread under noisy contactor and said i would put annother thread up relating to a side subject from that thread

(please do not reply untill this part in the brackets is deleted just got the original design up for now not got enough time to show the changes that will be made from the knowlege i learnt in my previous thread shall get the second part of up tomorrow then remove this section in brackets many thanks bernie)

 

[Bernard1991]

original system (scrapped looking for new ideas)

** Ignore this bit the idea has been scrapped I'm looking for new ideas, toward the end of the thread (page2) **

note: not in operation genny has not been connect nor will be conneted untill everything is complete
the genny has a output of 6.5kva

here is the original version i first put together
1) its a two contactor system both n/o
2) each contactor has its own control relay (2a 250v contact double pole, 12v dc coil with internal diode)
3) the main change over relay is a double pole double throw (two way) and the n/c connection (when the relay is dead) goes to the mains contactor control relay and the coil (230v) is energised when the genney is powered up and switched on at the main unit (switch is 250v rated) thus turning off the relay controling the mains contactor and energising the genny contactor control relay then engageing the contactor
4) both contactors has its own lumination on the main unit to tell the user if its engaged
5) the main unit has a lumination to tell the internal dc transformer is working
6) volt and amp meter telles user how much current is being used and the voltage out put (so i can work out how much power is being used and how much surplus there is)
7) everything is fused to protect the circuit
8) start and stop button for remote start and stop (when the genny has a auto choke and starter motor installed)

images below:

 

[Engineer54]

Well there is no way you can provide a mechanical interlock on what you have there!!

If you're determined to include a Generator into your mains system, then be wise and purchase a made for purpose Transfer/changeover switch either manually operated or automatic...

What is the make/model of the generator you intend to use for this installation, and does it incorporate a decent AVR on the alternators output??

 

[Knobhead]

Something’s going to go bang with that setup. Just hope no one gets hurt.

 

[Bernard1991]

Hi engineer I am totally re designing the part of the system with the contactors I shall be changing them to the same make moving both into the same box and having a interlock between them I asked in the first post if everyone could hold off a reply till I got the second half on only wanted to show the changes from what I had to what I will have from what I've been told and advised on what I got now is being scrapped (least the contactors in two places) shall have the other section on tomorrow not got enough time now as I'm in work at 8:15
shall also get the exact model number off the genny after work it's buried in the shed at this moment in time

 

[spark 68]

You may want to consider two timers in the control circuit of the contactors, this will stop the "chatter" problem alluded to by Lucien in the other thread.

The contactors will have to be physically side by side to fit the mechanical interlock between them

 

[Rockingit]

As much as I admire spirited thinking and creativity...... are we simply not just reinventing the wheel, here? An off the shelf changeover unit would be much quicker and cheaper?!

 

[Bernard1991]

They will be side by side mate the armoured cable going to the shed is a 6mm 4core (not ideall would rarther have two cables but it's only temp till the shed is re built in the near future)
how ever I have found a good price changer over switch on eBay (£60 with a clad box) only concern I have with a switch is it's inaccessible where the house c/u is I'll have my mother call me every time the power goes out and why there's no power when the genny is running and not something I want if I'm ever fault finding a pain in the back side break in a ring main but if the new version I have in mind is still a big concern I'll just scrap the lot and go with a change over switch and ignore any calls from my mother when at work

 

[Bernard1991]

As much as I admire spirited thinking and creativity...... are we simply not just reinventing the wheel, here? An off the shelf changeover unit would be much quicker and cheaper?!

possibly if you know to a place that has them for less than £100 so far I spent less than that (£50 I can get back just wacking the contactors I got on eBay as for the relays I'm allways dabbling with electronic circuits so will find some other use for them)

 

[spark 68]

IME buying off the shelf ATS works out cheaper for the smaller sizes, and will be compliant, making your own does work out cheaper for the larger sizes or custom built ones sometimes, but building your own needs properly testing and certifying, I have done both.

 

[Bernard1991]

Just had a look on rs components and found out there's 4pole contactors with two n/o and two n/c poles

if I can get a 63a 4pole 2n/c and 2n/o (our main fuse is 60a) contactor would it be better and be safer and also have a delay on it to allow the genny time to fully spin up

so say have the genny on the n/o side and the mains on the n/c side start the genny when there's a power cut after 3 seconds or more the contactor will energise and isolate the mains and connect the genny to the house

whats you views on this guys?

 

[spark 68]

Please do not try to do this on the cheap, no disrespect meant, but you are clearly out of your depth.
Either buy a proper bespoke system, or forget it.

There are implications that you have not thought of, and attempting to do what you are trying to achieve will likely end in tears.

The internet is no way to try to learn what you are trying to do.

This is the best advice I can give you.
Sorry I am out.

 

[Bernard1991]

I'm not trying to do it on the cheap if I wanted to do it on the cheap I would have got a £60 basics changeover switch in a metal clad box but though my mum knows 0 about electrics so would be better if all she had to do is turn the generator on and not have to climb on chairs just to flick the switch to change it over she isn't getting any younger neither is my dad and I won't be living at home forever so I come on here to learn about generator installations and work out the best course without it costing a arm and a leg

at least I sought advice before going any further I knew a guy who had a length of flex with two plug tops one either end he pluged into his genny and the other into a socket then he would turn the main switch off on the c/u then start up the genny now surely you cannot get any more dangerous than that no Rcd protection and no fool proof isolation

 

[Plonker 3]

I'm not trying to do it on the cheap if I wanted to do it on the cheap I would have got a £60 basics changeover switch in a metal clad box but though my mum knows 0 about electrics so would be better if all she had to do is turn the generator on and not have to climb on chairs just to flick the switch to change it over she isn't getting any younger neither is my dad and I won't be living at home forever so I come on here to learn about generator installations and work out the best course without it costing a arm and a leg

at least I sought advice before going any further I knew a guy who had a length of flex with two plug tops one either end he pluged into his genny and the other into a socket then he would turn the main switch off on the c/u then start up the genny now surely you cannot get any more dangerous than that no Rcd protection and no fool proof isolation

Please don't tell me you are serious?

The courses have a cost for a reason, not to deter you from doing them but because of the effort and time people have put in learning about them so it can be done safely.

That statement makes a Electrical Trainee sound lime they know what they are doing.

 

[UNG]

To the OP
Cost cannot be the main and overriding concern where safety of the user and others is put at risk for the sake of a few pounds this coupled with the distinct lack of knowledge you possess regarding generator switching is a recipe for disaster

Your best option is forget it or spend some cash and get someone in who knows what they are doing

 

[Bernard1991]

Well I'm just going to scrap the lot and go back to basics (no pun intended)
below is a picture of a basics changeover switch generator transfer 125a single phase metal clad m125cs (that's how it's advertised) will that be ok?
And later ill put the model number of the generator I have and ask if that's ok to use

 

[Clive P]

Hi,

Surely you can get hold of an Automatic Change-Over switch, then your parents can sit back in comfort and let the little magic box do its business.

Regards.

 

[Lucien Nunes]

I can see a number of worrying things there. But let's start with that connector marked 'hook up to genny'. Am I going blind or is that a socket-outlet? Please correct me if I am not seeing it for what it is...

And another thing that's actually more dangerous, do I see the tops of the contactors accessible from outside the enclosures, so anybody could (intentionally or accidentally) press the manual operation button and cross-connect the two sources?

Perhaps I had better not look any more...

 

[Bernard1991]

I can see a number of worrying things there. But let's start with that connector marked 'hook up to genny'. Am I going blind or is that a socket-outlet? Please correct me if I am not seeing it for what it is...

And another thing that's actually more dangerous, do I see the tops of the contactors accessible from outside the enclosures, so anybody could (intentionally or accidentally) press the manual operation button and cross-connect the two sources?

Perhaps I had better not look any more...

It's a 32 amp three pin socket (like on a caravan)
but I have scrapped the idea now so it's redundant and will be removed

 

[Lucien Nunes]

So you had a plug connected to a source of energy. With apologies for the pun, I recommend you pull the plug on this project and have a commercial transfer switch fitted. It really isn't worth the (many) risks you are taking with the present setup, due to lack of familiarity with the requirements.

 

[Bernard1991]

I have scrapped it and shall put the contactors used on eBay to get my money back
The immage I put on post 16 would that be safe to use for what I intend in terms of a manual change over
and shall like said in other posts look into a proper pre build control unit as a second option and get a good wiring diagram wire it up myself following it and get it properly commissioned and even have the commissioners number to hand if I get stuck (should be fine with a wiring diagram first year college I was drawing them up and in electronics I was making timer circuits and led light circuits all for 12v dc use and not ever supplied by 230v power)

But all this hinges on the generator and here's some info on it
couldn't get it all it's seriously buried under who knows what

aulternator
type. Mr1180 j609b
code. 0330202235
Date. 1999

output:
50hz
56a 110v
26a 230v

engine rpm 3000
made by. Vanguard
if there's anything more in particular anyone needs to know off the alternator let me know and I'll see if I can find it

 

[Lighthouse Phil]

last thing I need is to be pulled into a can of worms here...
I work with auto change over gents on a almost daily basis... Buy a Mains Fail change over contactor unit off the shelf,, it will have all the wiring already done and will include a mechanical interlock too.
By the sound of the description of your genny, I don't think I will have a decent AVR, so don't supply any sensitive electronics with it...
Have you thought about Earthing of the genny ?? It will need its own earth rod / matt and neutral and earth linked in the alternator
The list could continue....

 

[Bernard1991]

Hi Phil I had a feeling I would have to do something with re guards to earthing other than just it's supplied earth
I did think on the lines of a earth rod in the ground connecting to the neutral like you said I presumed this as when I was studying electrical they told us a bit about transformers on the grid and the earth was linked to the neutral and rodded to ground, won't go into it too much as we all know why it's done that way (different kettle of fish a transformer from a genny I know)

ill see if I can find a wiring diagram for the genny but on top of alternator there's a box with two 110v plugs and two 230v plugs with thermal cut outs built in for both voltages and a switch on the front to change it from 110 to 230 and all the cables come out of the alternator into it

as for the changing over from mains to genny my dad wants it to be manual (to quote him simplicity is efficient) so a few posts back I put a picture of a basics generator change over switch will that be good to use or would you recogmend something else that would be better suited?

As for the AVR I'll see if I can find one for my genny
And the only electronics we have is the useuall house hold items tv, sky, computers, router, iphone, iPad and drivers for led down lights if you want to count them

 

[Engineer54]

And the only electronics we have is the useuall house hold items tv, sky, computers, router, iphone, iPad and drivers for led down lights if you want to count them

All of which can be blown/damaged by a genny without a decent AVR of one kind or another...

An ATS can also be used in manual operation, and to be honest, if this gen-set/transfer switch is not going to be located in an easily accessible location, then ATS operation makes much more sense than manual operation. Especially if it means going outside in the pouring rain etc, to switch the damn thing on or off!!

 

[Darkwood]

Contactor buzzing! we have either saved your day or shown you the path to a nightmare ....either way i hope you can now appreciate why you were initially been given a rough ride ..... i hope by now you can appreciate with the wiring plan you originally supplied you were way off mark and in for a steep learning curve .... given both the threads there are still areas we haven't even mentioned ... im thinking you dont really get it that you can't design a compliant system by forum shopping and picking it up bit by bit....

A little knowledge is your enemy here and just wish you would appreciate the regulations and standards you need to comply to; some life critical others down to simple things like correct panel design etc (ot so critical).... no offense but you could be several yrs off the knowledge required to get this right.

 

[Geordie Spark]

You'll find some nice genny stuff in here.

Souter Lighthouse | Worldwide Lighthouses

 

[Silly Sausage]

Your man has been dribbling on about automatic Gen changeover so his wrinklinly old mother doesn't have to stand on a chair to turn a switch.
She's still going to have to leg it down the the shed in dark to turn the damned thing on.


OP, I think you'll find your parent(s) can manage quite well without you!

 

[Knobhead]

OP, I think you'll find your parent(s) can manage quite well without you!

Thanks Archy, thats summed it all up!

(I hate giving Archy a thanks)

 

[UNG]

She's still going to have to leg it down the the shed in dark to turn the damned thing on.

Or top up the fuel or is that the next automated project

 

[Plonker 3]

Or top up the fuel or is that the next automated project

Better prepare for a thread on how to terminate MIMMS then