Require help!!

[r1rider]

Hi.. could someone with stop/start contactor arrangements spare a moment to help me out?
I have 2 straight forward stop/start contactor circuits..When either of these is energised a third contactor must be pulled in. this i have done but when i press the stop button for either contactor nothing happens. the only way the contactors drop out is if both stops are pushed together..any ideas or a diagram to overcome this would be fantastic.
thanks.

 

[Spark123]

Can you use one of the contacts from each of the 2 contactor (N/O) wired in parallel to provide the switching for 3rd contactor?

 

[r1rider]

this i believe is what i have done and the result is a backfeed so that even though i try to de-energise one contactor the other contactor then carries on powering up the first contactor ..if that makes sense.. wish i could draw my circuit for you but do not know how to on a mac.

 

[Lectrician]

You ideally want some add on contact blocks, and use these to power the additional contactor. You have paralleled some of of the control circuitry together by the sounds of it, which allows one to back feed to the other.

What are you actually doing?

 

[r1rider]

hang on.. a picture is on its way!

 

[r1rider]

Untitled

• r1rider
• 21 Apr 2008
• 1

 

[r1rider]

Is it tea time or have you all fallen asleep? Lol

 

[Spark123]

Just stuffing my face
See if you can follow this:

Untitled

• Spark123
• 21 Apr 2008
• 1

 

[GaryMo]

When either contactor (Lev1 or Lev2) is energised you want contactor NVAIRE to energise?
When the stop button of either of Lev1 or Lev2 is pressed you want NVAIRE to drop out? even though the other remaining contactor may still be energised?

 

[r1rider]

Thanks Spark123.. strangely i have just drawn the same thing... no honestly...i was just in the process of deciding if this would cure my problem (the electrical one) ...(before someone lowers the tone) .
Me thinks we are on to something.

 

[Spark123]

What's it for? (Just being nosey now!)

 

[GaryMo]

Just stuffing my face
See if you can follow this:

Untitled

• Spark123
• 21 Apr 2008
• 1

If he's asking what I typed above then that wont work either as NVAIRE will always be energised whilst either one of Lev1 or Lev2 is energised. Both would have to be stopped to drop out NVAIRE.
Your drawing works in the same way as r1riders.

 

[r1rider]

Gary.. when either lev1 or lev2 are energised nuaire is energised and will stay energised until both lev1 and lev2 are off. Hope this is now clear mate ..i may not have explained very well.

 

[Spark123]

Your drawing works in the same way as r1riders.

Oh no it doesn't

 

[GaryMo]

Gary.. when either lev1 or lev2 are energised nuaire is energised and will stay energised until both lev1 and lev2 are off. Hope this is now clear mate ..i may not have explained very well.

In that case your drawing should work.