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Registered Member #535
Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65
hello,
This is my first post. I have had excellant results with my nst tesla coil. I now have in my posession 4 mots that I want to wire for 240. Does anyone have a schematic or explanation on how to do this?
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Hey no problem I can tell you how to do this painlessly. Each set of MOTs - series the primaries for each pair and simply run 240V through them. ---in other words link two leads of the secondary together and pass 240V through the free leads on either end- You will need 30A 240V MINIMUM just to run a power supply of this size!
Registered Member #535
Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65
sorry i drew a pic but it didn't load. So let me get this. i wire the mots in pairs. for each pair i wire the primaries in series. On the high volatge side i wire the 2 hv leads together. do i float the neutrals or tie them to the mains ground. I have lost two meters honeslty lol.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I always get a little apprehensive when someone asks how to hook up a bunch of MOT's and someone replys with an answer, but fails to consider the insulation class of the transformer. Yea I know people have done it before, putting 4kv worth of stress through a 2kv nominal coil, but its just dangerous!
If you are doing this at your house, and you have a dryer socket, you have a neutral, the black hot, and the red hot, giving you 120 in 2 phases.
So here's the 'Smart' way to do it. Both core ground returns are connected to neutral so each core never has more then the appropriate level of potential on them. Then each primary winding still gets 120, and both are out of phase by 180, giving you 4KV midpoint grounded and the MOT's are happy. If you want more current then just add your two more MOT's in with paralleled HV lines.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I forgot that since the RED line is already 180 out of phase with the BLACK, there really is no need to switch the phasing. Now if you needed the phase reversed and only had the BLACK, THEN you would reverse the connections on the transformer to get your reverse phase.
Registered Member #535
Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65
okay ,
I have wired the 4 mot's together. I now realize the limitations of beer caps as i need about 50nf instead of the 13nf i used with my nst driven coil. I also want to build a voltage doubler on the hv outputs.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Remember to double check your phases before power up. If your phases are wrong, you might blow out the transformers. Fuse each primary hot as a safety.
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wiring 4 mots for 240
