Contactor wiring question.........

[anthanth]

Hi all.

I have to wire this contactor below next week. Can any one help with the below questions?

Schneider LC1D25B7 Te-sys Contactor 11Kw 380/400V 25Amp 3 pole AC3 with 24Vac coil 50hz and N/O & N/C auxiliary contacts


I have 24v transformer providing power in it. which goes in on A1 and A2 i presume. Does it matter which is
N or Live??

As i m looking for a normally open contact do i bring the live into 2L1 then come out of 1L1 ?? Or do i use
the connections on the front as in 13 and 14??

If any one has any info that would be great.

many thanks

 

[snowhead]

A1 A2 doesnt matter.

1L1 2L1 are the load contacts, 13 14 are auxillary with far lower rating.

 

[anthanth]

A1 A2 doesnt matter.

1L1 2L1 are the load contacts, 13 14 are auxillary with far lower rating.

Ahha ok. nice one for that. I guess the neutral load out has nothing to do with the contactor then??

Still slightly confused as i ordered a NO contactor why it has the option of NC on the front??

thanks for your help

 

[malcolmsanford]

Most contactors will have a normally closed terminal, it can be used for locking on a DOL starter or used for warning lights on a failure of some kind.

Contactors will not have either LINE/NEUTRAL loads just loads, but you can wire a 230v LINE/NEUTRAL into the unit and have double pole isoloation

 

[anthanth]

OK yes.

So this could be used for 3 phases where the neutral would not pass through contactor or as it
is single phase use a pole for Live ( 1L1 and 2T1) and N (3 L2 and 4T2)

24c supply on the A1 and A2 coil. As this is 24V 1.5 mm cable should be ok.


Have i got that right now??

cheers

 

[malcolmsanford]

Your there yes, some applications will call for 3phase and Neutrals to go through the contactor which is why they make 4 pole contactors, but in normal cases then, you would have the neutral unswitched.

1.5mm is fine, normally if it was in a panel you would use 1.00mm/1.55mm

 

[telectrix]

24c supply on the A1 and A2 coil. As this is 24V 1.5 mm cable should be ok.


it's not the 24V that determines the size of the cable, but the current drawn by the coil, which is very low compared to the load. that is why contactors are used. so a small diametre cable can be used for the switching of a large load.

 

[Knobhead]

24V what? AC or DC?

 

[electric will]

24V what? AC or DC?

was thinking that , surely dc would try and push the solenoid the Wong way?

 

[telectrix]

24Vac according to the op's link in post 1.

 

[micknew]

was thinking that , surely dc would try and push the solenoid the Wong way?

dc would not affect the direction of the magnetic force but would burn the coil out due to the lack of back emf.

 

[Knobhead]

AC on a DC coil? :biggrin5:

 

[micknew]

AC on a DC coil? :biggrin5:

ac on a dc coil would cause the iron core to overheat due to large eddy currents being induced into into the non laminated iron mass.
The heat would burn the coil out.

 

[infinity]

It states ac on the data sheet/ title of contractor

 

[ayjay]

i hope its a direct replacement for the existing coil

 

[steve50]

who said it was DC

 

[bryanh]

I used DC coils via a small rectifier this will stop contactor chatter

 

[Robotstar5]

I used DC coils via a small rectifier this will stop contactor chatter

Can't remember the last time I used AC, normally use a 24VDC PSU in the control panels I build.

 

[anthanth]

Hi Guys. yes it is a ac coil. A 24 v sent from the transformer. In rush current is 70 va so about 3 amp current will flow to the contactor.

Has any one ever put in the cool power product EMMA with GVS or EC ??? link below??
Coolpower Products UK - Smart Sustainable Energy