3 phase contactor with overload

[Akanami]

Hi all,

Could some one explain the correct way in connecting a 3phase contactor with overload protection.

I have the supply going into l1, l2, l3 and motor connected to the load terminals, t1, t2, t3. I also have the 230v connected to the a1 coil and neutral on a2. Just a bit confused with over load connections. I'm pretty sure it has to be on normally closed.

Thanks

 

[pepparz]

So do you think manufacturers supply plant worth millions and let the buyer just switch it on?

Commissioning can take days or even weeks on some plant

no i dont think that. you just set to FLC end of story.
yes darkwood you are correct, i didnt include 25% to star/delta what can i say im a fool, how can i recover from this, yes its the end ,suicide is the only answer, goodbye cruel world.

 

[Darkwood]

Ive got a feeling you won't lose any sleep any time soon ... rrr:

 

[pepparz]

no mate thanks for the banter.nice to have a good discussion

 

[Knobhead]

125% comes from the days of magnetic dashpot O/L’s. It’s a hangover that just won’t go away.

 

[Lucien Nunes]

What d'you mean Tony? Are you saying these electronic motor protection relays haven't got teeny little dashpots inside? I've been ever so careful to keep them the right way up all the time...

Pepparz: Centrifugal blowers - maximum mechanical load normally when flow is completely unrestricted. If you've run it up like that in the shop, you know what the maximum line current will be, ever. If it was 75% flc then why set higher?