12 leads will be Delta. It'll be necessary to find six pairs. The trick is finding which three can be the "y", and which of those to combine. same method, just more tests to find what is adjacent to what
there will only be one group of three windings connected together in a 9 wire WYE connected motor. once you find this set you can mark any wire 7,8 and 9. you will then follow along to find the other windings in the correct sets and polarity. I started with 7,8 and 9 in the original positions so I could prove I found the other sets and also in the correct polarity....
I'm not knowledgeable on the internal wiring in the motor and can't seem to find an illustration of that makes real good sense to me. :-). I don't understand why 1/2 --3/4--and 5/6 pairs can't be any two wires that show continuity. It would seem in 3 phase it would only change the direction of rotation if interchanged. I know I must be missing something. I'm trying to ID for a 220 3 phase power source
@@jaspermcconnell6417 yes. The windings need to be wired in the correct polarity. If a winding is wired in reverse polarity, the magnetic field it produces will fight against the other windings magnetic fields
sorry i dont understand, you are naming wires with numbers instead of UVW, XYZ? thats confusing, the 7,8,9 i assume represent RST or L1L2L3 power wires, and the other 6 are the windings pairs but i cant understand what you are testing
Some company posted a video using the same method and called it Angie Hand’s identifying unmarked 9 lead Wye connected motor. One circuit with three leads and three circuits with 2 leads. I understand how 7,8 and 9 are identified, etc, but how do you know with authority the 8 is 8? I don’t see with Ny of the methods a that are used that you can do anything more than identify relationships between the different leads. No doubt this shows the relationships between the two lead circuits with the appropriate lead of the three lead circuit. If you start out like you did in this video with 7, 8 and 9 identified, then there’s no problem knowing which are 1 and 4 etc, but I fail to see how you can know which was marked 8 from the factory if 7, 8 and 9 have all lost their markings! This test doesn’t demonstrate that!
When Identifying 1&4 If you are flashing the correct pair (ie 7,8,&9) then pairs 3&6, and 2&5 will have similar deflection. Only pair 1&4 will be a very small deflection. That is how you know you have 1&4. See our blog post. It has pictures of the correct order as well. I believe I placed the link in the description section. If not, here it is. www.accesstopower.com/blog/identify-unmarked-leads-in-a-9-lead-wye-connected-motor
Those are the three center windings. There are six total windings in the motor. Three share a common point and the other ends of those windings are leads 7, 8, and 9. The other three winding are between 1 and 4, 2 and 5, and 3 and 6.
if you have the 3 groups of two misswired, meaning one of the group of 3 is included in the other groups, then you would have continuity on all 9. the only way to test them accurately is to unwired all 9 and test them individually. if they still have continuity you motor has problems.
I went access the document that explains the video and received message on google docs that says it has been deleted. Is there somewhere else I can access this document? Much appreciated.
SeanLeonDrums yes. However you number these 3 wires will determine the groupings and polarity of the other 3 windings. See my blog post on this topic accesstopower.com/identify-unmarked-leads-in-a-9-lead-wye-connected-motor/
When labeling 7 8 9, does that change the other pairs? If the motor leads were originally labeled as 7 8 9, and you change 7 to 8, 8 to 9, and 9 to 7, will that change which pair is 1&4, 3&6, 2&5?
callitw, Yes if you change 7, 8, and 9 then the other pairs will change as well. But they will remain in the correct order, or relationship in the wye configuration of the motor windings. In the video, I left 7, 8, and 9 the same so I could prove the pairs, once found, would be the correct pairs in the correct order.
@@AccessToPower thank you, sir. It never ceases to amaze me what you can find on YT. Any project or problem or idea, etc, you will find someone addressing it. Teaching you the theory or hands-on how-to’s. All we had as kids were books and encyclopedias or taking a class. Thanks for dedicating your time and effort to educating people in your field of expertise. May the Lord bless and keep you and your house. 🙏🏼
@@AccessToPower great video. So I am replacing a stator and I started shortening wires before relabeling them was able to deduce the positive negative ones as only cut 4 wires prior to realizing my mistake. I had 9 uncut but have 7,8 left and do not know which is which. Pump can be wired for 220 or 460. My question is what happens if I simply guess 50/50 chance of being right, but happens to the stator if I am wrong?
I have tried changing 7,8,9 around and ringing one out 3 times, but the motor still only runs at half speed, no matter which of the 3 ways I did it. Stumped.
Hi Darcy, I am not sure what you are needing to do, but if you have a Y connected motor, then 7,8,&9 should have continuity when everything is disconnected. there will be the one group of 3 (7,8,9) and 3 groups of 2. If you have a delta connected motor then this method of identifying leads will not work the same way. In a 9 lead delta connected motor you will have 3 groups of 3.
@@AccessToPower its Y wound. No matter what combo of 7,8,9 I start with (which changes your pair numbers) it runs at half speed. Fought another motor like this before, not the easiest thing to take to motor shop since it's a direct drive machine.
I am sure we can get the proper polarity and connection of the windings if we follow that. but I am not sure if once we already fixed the connection is T1. T2 and T3 will be the same. maybe T1 would be T2. T2 would be T3 and T3 would T1 because from the very begining, we are not sure if T7 is T7. may it is T8 or T9 but even the original marking will be change it will work.. based on my obvervation....
**DO NOT** run DC current through an AC motor. This results in no induction of EMF to oppose the current flow and it increases to unimaginable levels and ends up burning out the coil. Use an AC current and an O-scope to probe the motor instead. I've posted a video on how AC motors work based on my college curriculum if you want to learn more.
