Star Delta Starter Motor Is Not Running At Delta

>There are 3(+) pages on CR4® on this very subject< You found CR4® by searching the internet, so click on the highlighted link and educate yourself

In another words, Do Your Own HomeWork!

Didn't AP#1 post this topic a couple weeks ago?

One presumes the motor is still not operating.

Use this simpler step to check your star delta starter condition.

Step:

1) Dismantle out the 6 wire to to your motor at the contactor side or at the star delta terminal side. This is to test the circuit condition.

2) Put the timer to a longer time about 30 sec

3) Press the start push button

4) The star and the main contactor will energize.

5) Check the 3 phase voltage at the Main contactor (Bottom side terminal) and the continuity resistance at the star contactor. Make sure you get 3 phase voltage at the Main contactor and the continuity at the star point contactor.

6) Wait till the Delta contactor energize

7) Check the Delta 3 phase voltage at the Delta contactor (bottom side terminal of the contactor) and make sure you get 3 phase supply.

If any one of the contactor phase does not get any voltage reading your wiring are wrong. Basically by seeing you can able to see what wrong with the star delta starter already.

How is he supposed to measure voltage and continuity at the same time with the feeder energized?

The motor wire has been removed out from the contactor so during when the you start the star delta starter, the main contactor and the star contactor will energise. He only need to measure the continuity of the star point contactor only.

Generally, in this case is either the Delta contactor is not energizing or the Delta of the motor winding are connected wrongly in which the U1 and U2 are connected at the same Red phase, V1 and V2 are connected at the same Yellow phase and W1 and W2 are connected at the same Blue phase. During the Starter in Star point stage, the motor will run as the U2,V2 and W2 are connected in star point. But during the Delta Stage the motor will not run if the connection is wrong.

During the delta stage the Motor winding U1 in the KM should be in Red Phase where else Motor winding U2 in KD should be in Yellow Phase, Motor winding V1 in the KM should be in Yellow Phase where else Motor winding V2 in KD should be in Blue Phase, and , Motor winding W1 in the KM should be in Blue Phase where else Motor winding W2 in KD should be in Red Phase.

We would be FAR more happy to help you if you joined CR4 and gave full details of yourself.

Also, do remember that the possible voltages pose a danger to life and limb, with you not understanding the problem, we might accidentally instigate your death, by remote control, accidentally of course!!

It is not possible to post on CR4 without being a member - this has been the case for a long time - thought you'd have known that by now!

The OP (AP1) has chosen to conceal their identity.

Does that make the slightest difference? Certainly not for me personally......

I see no logical reason to be AP.....

Logical reason is because their in over their head

Going overboard on exclamation marks again, are we?

"What others say about you reveals more about them, than it does you." Anon.

And the corollary: "What you say about others reveals more about you than it does them."

What I posted, which seems to have upset some here was :-

We would be FAR more happy to help you if you joined CR4 and gave full details of yourself.

Also, do remember that the possible voltages pose a danger to life and limb, with you not understanding the problem, we might accidentally instigate your death, by remote control, accidentally of course!!

To someone posting Anonymously......

Come on Guys, give me a break!!

Uhhh...I was sort of lamely trying to be supportive to you, Andy. I don't however, like the idea that one or all of us might say something that would give the AP permission to become a crispy critter.

Thanks for the support.

Obviously I feel the same way.....even if we would never actually know if he/she died....that does not remove responsible posting, from both OP and us answering....

Thanks again.

Happy 2nd day of spring! or is it the third?

It was the Vernal Equinox......

Thank you most astute traveler, bon voyage on today's journey!

There is no rocket science involved here. If your motor has zero current when the starter switches over to Delta, it's because something is wired wrong. There is nothing that could be wrong inside of the motor that would result in ZERO current flow if connected correctly. Start over, ASSume nothing.

I think you hit the nail on the head there! Somebody be thinking the electrons want to go, but the road block is up, and the electrons are smashing into that fence.

Or the drawbridge is up!

Here's a basic diagram.

From this diagram, Starting means you close K1 and K3, then after a few seconds, you open K3 and then close K2. If someone inadvertently put the coil of K1 through a NO interlock of K3, then when K3 drops out, so does K1 and the motor stops even though K2 is energized. People get really confused with Star-Delta starters, I'd look for something stupid like that.

Yes, it is generally a sign of someone up to the short nose hairs in water when they start off by saying, "it definitely cannot be this".

Whoever is doing this doesn't seem capable of resolving the problem, so it's time to call a qualified local Electrician instead.