3 phase supply no neutral how do i get neutral for the contactor coil??

[aldomack]

Hi I wander if anyone can help?

I have just wired up 2 3 phase motors on a Farm for a Auger System, I have ran in a 3 phase supply from a nearby J.B. There is only 3 phase wires and the outer armour of the cable connected to the body of the box as the earth on the J.B. I have run these into the Control box for the Auger and connected the earths up and the Phaes L1,L2,L3. These are going into the top of the breaker, BENEDIKT JAGER K2-09A. There is connections for the contactor coil A1 and A2, I require a neutral for the coil to work but how do I get this when there is none on the supply I have run??? hmmm I'm stuck

 

[Guest123]

Are you sure it isn't a 400V coil???

 

[aldomack]

So could I just run a neutral from another JB????

 

[aldomack]

No mate not a 400v coil

 

[Pat Tester]

Change the existing contactor coil to a 415v coil. Are you using a DOL starter ? or just an isolator to control it ?

 

[Guest123]

No mate not a 400v coil

Can you not change it for one then???

 

[aldomack]

I think it is a DOL starter? Not too sure to be honest. 2 mins, I am gonna attach some pics of the control box

 

[aldomack]

please see attachment

 

[Hawk81]

I think it is a DOL starter? Not too sure to be honest. 2 mins, I am gonna attach some pics of the control box

If you have already brought cables to this and part wired it how can you not be sure if it is a DOL starter?? Easiest way would be to change the coil to a 400v coil.

 

[Hawk81]

please see attachment
View attachment 4820

Anymore pics from staight on view?

 

[Hawk81]

So could I just run a neutral from another JB????

No this would be borrowing a neutral.

 

[aldomack]

Here are somre more photos, the incomming supply comes in from the left and into the top of the right contactor, the 2 contactors are linked at the top. The Motors are fed from out the bottom of the contactors,

 

[aldomack]

So if I get 400 v coils, I would not require the neutral?

 

[Hawk81]

So if I get 400 v coils, I would not require the neutral?

Correct. 2 phases will work the coil

 

[lewlec]

hi

normally on auger systems there are some sort of stop sensor or switch, not sure if you have this sort of set up but if so make sure that it is rated at 400v if using a 400v coil

regards
gary

 

[mechelec]

So if I get 400 v coils, I would not require the neutral?

thats right. it may be as cheap to replace contactors you will have to check.

 

[aldomack]

Cool, can you reccommend any type or part No's for what I require? The Motors are 1.99A x 2 . The type fitted are Benedekt and Jager K2-09A Unit if that means anything?

 

[aldomack]

Yes there are pressure sensors and these are connected, one wire is going to the neutral of the coil. God knows how I will find out if these are 400v rated there are no markings?

 

[Kenny.]

You could put a small transformer in for the control circuit like this Legrand | Transformers | Transformers | Din-Rail, Panel, Wall Mounting Transformers | 12, 24, 48, 115 And 230 Vac DIN-Rail, Panel, Wall Mounting Transformers |442 61

 

[Hawk81]

Good idea just remember to fuse the transformer correctly

 

[lewlec]

Yes there are pressure sensors and these are connected, one wire is going to the neutral of the coil. God knows how I will find out if these are 400v rated there are no markings?[/QUOTE

hi
how much of a job is it to run a neutral? maybe simpler than changing the current arrangement.

gary

 

[aldomack]

Sounds good, will probably need another Box to house this as no room.

 

[aldomack]

Gary, I did ask this question. It would be no trouble but on past thread was told you could not as it would be borrowing a neutral??

 

[lewlec]

Gary, I did ask this question. It would be no trouble but on past thread was told you could not as it would be borrowing a neutral??

running a neutral is fine as long as it is run back to where the distribution circuit for the auger is supplied from...ie dis board or isolator.

gary

 

[telectrix]

best solutrion is a step down transformer, 415/230v. cheapest and simplest. first try the coil with a 230v supply see if it pulls in.

 

[aldomack]

Will do, will try what I can tomorrow before having to uprate and buy more parts.

Cheers for the help

 

[Hawk81]

Gary, I did ask this question. It would be no trouble but on past thread was told you could not as it would be borrowing a neutral??

That was because you said you were going to take a nuetral from a different JB so I was correct

 

[aldomack]

Yes must have misread Hawk, no probs.

 

[aldomack]

Hopefully there is a neutral at the Dis Board? Should be eh?

 

[Hawk81]

Would think so. If there are lights and sockets then yeah

 

[mikehopkins]

Do the augers feed cows whilst they are being milked, if so , the augers will be controled automatically via a capacitive Senser.those contacters are DOL. the ones I have seen are 240v as the sensors are 240v.

 

[Knobhead]

Try reading the thread.
If the OP hasn't sorted it by now the cows are most likely dead!
The thread is over a year old

 

[noushad]

just try, connect one indicator series with contactor coil in between two phases.

 

[mikehopkins]

Try reading the thread.
If the OP hasn't sorted it by now the cows are most likely dead!
The thread is over a year old

Steady on ,it's not the end of the world!