Star Delta starters and timers....

[PEG]

Also,if you are not confident with the three separate contactors,be careful,not having the motor connected will NOT prevent damage,if the wrong two go in at once...what Darkwood said about understanding the specific control system,would prevent an error of this type. :stooge_curly:

 

[Tiny Spark]

Cheers guys, yes ime doing my best to fathom this one but its not been made easy.
Its over 20 years old and has no drawings etc.
I suspect there are fire relays and other such things in circuit as well.
I just found another scorched relay so just taking things a step at a time and hoping the guy on holiday will have some ideas when he gets back!!

 

[Guest111]

Ah the good old star delta,I remember going to one job and the original spark had royaly cocked it up,it was fine in start but when it went to run there was a hell of a bang and it blew the fuses.He tried it several times before admitting he'd not got a clue. lol

 

[Darkwood]

Cheers guys, yes ime doing my best to fathom this one but its not been made easy.
Its over 20 years old and has no drawings etc.
I suspect there are fire relays and other such things in circuit as well.
I just found another scorched relay so just taking things a step at a time and hoping the guy on holiday will have some ideas when he gets back!!

If as you say this is linked to the Fire system then this would up the anti- about attempting this as it has a essential safety system latched into it - this is where I would say leave it alone, before I was interested to see if you could figure it but with the extra info supplied Im a little concerned that if you do get it working and you have an actual fire then the system may not operate correctly and may aid the spread off the fire or smoke with major consequences - If yourself your colleagues are unsure as to how the system should act in a fire condition then you need to get in a Fire safety team to asses what the system needs to do to give the best chance of an evacuation of all the workforce.

 

[Knobhead]

Tiny, see the PM I've sent.

 

[Tiny Spark]

If as you say this is linked to the Fire system then this would up the anti- about attempting this as it has a essential safety system latched into it - this is where I would say leave it alone, before I was interested to see if you could figure it but with the extra info supplied Im a little concerned that if you do get it working and you have an actual fire then the system may not operate correctly and may aid the spread off the fire or smoke with major consequences - If yourself your colleagues are unsure as to how the system should act in a fire condition then you need to get in a Fire safety team to asses what the system needs to do to give the best chance of an evacuation of all the workforce.

Thanks for the advice dark wood, I am only assumeing that it may be connected to the fire system I can not confirm nor deny it at this stage.

I have basically decided to go back to basics with it so to speak so I have killed everything and I am now starting to make my own drawing for the circuits as they are wired now.
I am hoping this will give me some idea as to what various parts are for and how they interact with each other.

I also found out a little more history on it today, Apparently it has not worked in atleast 5 years and nobody knows how, why or when so its a bit of a mystery tbh. Also the reason there are no drawings is apparently the company had a falling out with the contractors upon completion of the installation so they refused to hand them over.
Added to the fact the number system is all to cock and nothing is labelled leaves me down ta creek without a paddle!

Doing the cable tracing has brought a few things to light for me which seems rather wrong such as a speed control indicator lamp wired through one of the OL aux's that is apparently not part of the system :s
Also I found the feed to my timer from one of the breakers, But I noticed there are 2 wires in said breaker and the other wire also goes back to my timer! They both go through a series of relay contacts and other coils but 1 goes to A1 and 1 to A2 now that cant be right surely?
I can appreciate depending on what the relays etc are doing the supply could be switched from 1 side to the other but I have never seen a control circuit with 2 feeds to the same thing :s

I will continue to trace wires for the time being as long as my boss permits more for my own curiosty and self learning purposes than anything as I am becoming increasingly doubtfull this thing is going to work anytime soon in its current state

 

[Darkwood]

Good luck but sounds like an uphill battle ...personally I would scrap everything you see and start from scratch ... multiple command wires are common where auto start may be an option or as you said when the fire alarm goes off - it may over-ride the system stopping the fans or running them subject to fire risk assessment.

Ensure what you have originally is star/delta and not a 2 speed arrangement or even forward reverse set-up.. their are so many motor variations and control that often even the knowledgeable get confused.

Id also identify the motor and check for a plate - this will be a big clue to how it may have worked, and Im also betting if the controls were in such a poor state of repair then the motor will probably need testing long before any voltage is applied, if its been sat for several yrs depending on the environment it may be the case its sha**ed.

Check out Tony's PM as well if you already haven't.
PS - he's an old grumpy bugger but has a wealth of information even i admire

 

[Tiny Spark]

Well its defo star delta, Quite a large portion of the system was replaced by the other guys last week.
New motor (old one was well and truly kaput!) , New Isolator, New collet, new phase cables etc. They only found this bit ime on now was cream crackered when it blew up in one of their faces!
So hence the now replacement of contactors etc etc.
I think originally everyone thought it would be a straight forward repair but its turning into somewhat of a mission!

I think the gaffa may well ask me to just get it going, Which is fine I can easily get it going star delta on a regular start/stop circuit but of course that then completely cuts out and safety circuits, temp control etc etc.

I never seem to get easy things to cut my teeth on.... LOL

 

[Tiny Spark]

Well the plot has thickened but I have made some head way into this mystery. (Kinda)....

So i have continued my cable tracing this morning and found one of the aux contacts on the delta to be connected to a supposedly unused and unworking speed control.
We all thought it odd it had speed control as there was no inverter etc on the motor but as it had never worked didnt care.
Anyhow after finding it is connected I decided to power up the control circuit and try it.

So i press start the star and main contactor pull in as normal then sat there like it has been.
Next i operate the speed control switch, both contactors drop out and the delta pulls in!!

Yay ive found another fault and probably the reason for the damaged equipment!!

So i have now come to the conclusion that my suspicions were right and this has been bodged n butchered so i have asked my gaffa to get a controls engineer in here to help me with this.

If it was straight forward star delta ide sort it myself but i know with the 11 unknown relays and 4 timers thrown in the mix its going to end in tears or my sack so think ime calling it quits here lol

 

[Bobster]

Well the plot has thickened but I have made some head way into this mystery. (Kinda)....

So i have continued my cable tracing this morning and found one of the aux contacts on the delta to be connected to a supposedly unused and unworking speed control.
We all thought it odd it had speed control as there was no inverter etc on the motor but as it had never worked didnt care.
Anyhow after finding it is connected I decided to power up the control circuit and try it.

So i press start the star and main contactor pull in as normal then sat there like it has been.
Next i operate the speed control switch, both contactors drop out and the delta pulls in!!

Yay ive found another fault and probably the reason for the damaged equipment!!

So i have now come to the conclusion that my suspicions were right and this has been bodged n butchered so i have asked my gaffa to get a controls engineer in here to help me with this.

If it was straight forward star delta ide sort it myself but i know with the 11 unknown relays and 4 timers thrown in the mix its going to end in tears or my sack so think ime calling it quits here lol

If you produce a rough drawing, PM it me and I will give it a look over for you.

 

[Tiny Spark]

Thanks rob very kind of you.
Its still a *cough* masterpiece *cough* in progress though lol

I have 7 pieces of a4 taped together atm and growing rapidly lol

 

[Bobster]

If you've not much experience in drawing out panels, considering this isn't very big. Your better just producing a point to point list, then producing a drawing from that.

This way is a piece of cake when cores are marked up properly, however I can't imagine your panels are.

 

[Tiny Spark]

You would be right there rob lol
Some are numbered correctly, some not, and some not at all.

Ime in the process of drawing out a very rough circuit diagram which is slowly painting a picture but still much to draw out and its getting increasingly messier and harder to read!!

 

[Darkwood]

Well the plot has thickened but I have made some head way into this mystery. (Kinda)....

So i have continued my cable tracing this morning and found one of the aux contacts on the delta to be connected to a supposedly unused and unworking speed control.
We all thought it odd it had speed control as there was no inverter etc on the motor but as it had never worked didnt care.
Anyhow after finding it is connected I decided to power up the control circuit and try it.

So i press start the star and main contactor pull in as normal then sat there like it has been.
Next i operate the speed control switch, both contactors drop out and the delta pulls in!!

Yay ive found another fault and probably the reason for the damaged equipment!!

So i have now come to the conclusion that my suspicions were right and this has been bodged n butchered so i have asked my gaffa to get a controls engineer in here to help me with this.

If it was straight forward star delta ide sort it myself but i know with the 11 unknown relays and 4 timers thrown in the mix its going to end in tears or my sack so think ime calling it quits here lol

The assumption we all are making is this is a Star/Delta starter but as you drip feed me info its sounding more like a control for a 2 speed motor which can be easily mistaken for a star delta arrangement if you are not accustomed to it... can you take a photo of the motor ratings plate ... that should reveal which it is, either that or its a manual star/delta changeover found on older systems ...need alot more info but if with our aid you can at least identify it it will be big brownie points when the sparks/engineers get back.

 

[Tiny Spark]

I can get you one tomorrow dark wood