merlin gerin contactor problem

[333rocky333]

The heat tends to destroy them, but they usually discolour first then go open circuit.

A short circuit can often destroy them but most I have known then weld the contacts in the on position.

The red flag indicater is usually unreliable and faded after prolonged use.
But on the new one should be visible if the coil is energised.

Merlin gerin use a long part number stamped on the front,Do you know that number.

 

[danny001]

hi,

yes the number is

16025

thanks

 

[333rocky333]

Yes as you say that is 24vac and N/O contacts, if that was what was there before, then it may be the 24 V coil circuit that needs checking out.

It would seem unlikely to use 24 volt in this instance though.



http://www.voltimum.co.uk/catalog/p...CT2000-contactor-24Vac-coil-Merlin-Gerin.html

 

[flameport]

Contactors are simple devices. If the circuit is not working, either:

1. The wiring is wrong
2. No power is getting to the contactor coil
3. The contactor is the wrong type
4. The contactor is busted

A few simple tests will identify the problem.
Is the right voltage being applied to the coil?
Coil resistance - if open circuit, it is broken.
Continuity between the contacts - do the contacts open and close?
Is there power to the device(s) being controlled?

Don't believe what other people are telling you - the old 'it worked fine until yesterday' often means 'it worked until Bob the Bodger had a go at it.'

 

[RF Lighting]

So, you have put your new contactor in, connected it all up, put your meter onto the supply terminals of the contactor and got a reading of 24V AC. Is this correct?

 

[333rocky333]

http://www.schneider-electric.co.uk...re.nsf/luAllByID/LWIX-4GRHC2/$file/SECT6.pdf/

A1 and A2 are your 24 volt coil

 

[danny001]

hi,

i have a reading of 230v on the incoming supply to the contactor
but it will not close so iam getting nothing on the other side

thanks

 

[danny001]

hi,

thanks i have feeling iam going to find the problem in the last place i look

thanks again

 

[ricicle]

Ignore the 240V on the main incoming terminals - have you got 24V AC on the coil terminals ?

 

[Lectrician]

Ignore the 240V on the main incoming terminals - have you got 24V AC on the coil terminals ?

Thats the A1 and A2 - check this!!!!


Lets put that in bold!


Ignore the 240V on the main incoming terminals - have you got 24V AC on the coil terminals ?

 

[JACKC]

Agree with above, you need to check coil operating voltage on A1 & A2, 230v on incoming contact is just waiting for the contactor coil to energise. Don't believe Odd Job Bob and the time switch is ok, it sounds like a coil supply fault to me. I have not known a MG contactor to fail so quickly so I would ensure it is 24vac supply going into it before replacing.

 

[VanSolo]

Very weird set up this one. Why would a site electrician get someone with no knowledge of contactors, timers or control circuits in to do the job. I think an electrician is required, not a DIY forum job.

 

[raydar]

contactor coil needs two things to switch. voltage to coil feed AND a good coil neutral.
Eihter could be switched to provide the control.
simples no!