Phase power

[larry mullen]

I,verun powerto my shear , I tried to jump of my lathe with the generated leg of my rotary phase converter to the shear along with suppling 220 to the shaer {lathe was already wired in from another source } from a disconnect 50amp plug. The rotary conveter will not start when both are on the generated leg . Why is this ?
Larry

[oldgoaly]

Couple of questions to clarify the problem all 3 phase motors? Your starting the phase converter 1st? then starting the next motor, then the 3rd? Is phase converter big enough? 5 hp running a 3 and 2hp motor. tt;)

[Dawai]

http://www.metalmeet.com/forum/picture.php?albumid=55&pictureid=6958

Larry, at first glance, it appears that the red wire is terminated incorrectly.
THE terminal there on the right is not a "power" connection, but a low voltage connection through probably a holding contact. THIS will probably sink the xfrm voltage down..

THE three wires on the left are the 3phase wiring.. THEy go in the top and out to the overloads on the bottom.

I'm about half blind today and got plenty of distractions here of my own..

[Dawai]

That appears to be the phase generator panel??
THE time delay there on the left is for "motor spin up??"

Do you have a schematic of the panel, hard to trace the wires from here..

Probably, they hook the 220 to two legs, and let the 3rd generated leg backfeed back up through the contactor..??

I can not see the place where the red wire is connected well.. ?? can you take another picture??

[larry mullen]

Terry, the rotary converter is 10HP. think we are good there.:cool:
David the motor contactor is marked L1 L2 L3, terminal all the way to left is marked 2 :confused:
That is the shear panel in the picture
THanks Larry

[Dawai]

Larry, Just to humor me.. Perhaps I am looking at a angle?? I tried blowing up the picture and it still looked wrong..

THE power comes in the top, there is "straight across" contact pads-bars inside the contactor that go in and make connection top to bottom terminals..

L1 in, T1 out bottom.. to the overload block there.. and then out to a phase on the motor.. L2-T2, L3 T3...

Don't get excited or put power back on it till we figure it out..

[larry mullen]

david
It hit me what could me wrong last night . Swapped two leads,
the,motor was running in wrong direction , runs and cylcles like it should:D

Thanks Larry

[Dawai]

Great Larry... good fix. I'm still scratchin my head here.. And I am still half blind today. Another of them things "where being there" works..

Okay, now do yourself a favor and label the front of the box "two separate power sources".. Just so it won't sit there like a snake waiting on you to "get bit"... I don't care for the way you did it, but it is your dog to hunt..

My preferred method is a 4 pole twist lock plug and MOVE the phase generator power over to the new device by moving the cord to a new connector. OR take it back to a panel and put a bus bar in with main disconnect for all, and 2 pole breakers for each device.. There again you have to label it, external power at each 3ph machine.

THE red wire is probably not rated to be open-exposed.. Like a rubber SO, SJ SVO SVJ cord is.. I have pulled THHN down a exposed wire tray, but didn't like it.. On big jobs, thou I have a JW-ICT license to NECA quality work on my own, you do what the guy says who has the check book.

I've not worked that much in my craft since 2003.. about retired. For the past two months I have not accomplished much at anything.

[larry mullen]

Okay, now do yourself a favor and label the front of the box "two separate power sources".. Just so it won't sit there like a snake waiting on you to "get bit"... I don't care for the way you did it, but it is your dog to hunt..

My preferred method is a 4 pole twist lock plug and MOVE the phase generator power over to the new device by moving the cord to a new connector. OR take it back to a panel and put a bus bar in with main disconnect for all, and 2 pole breakers for each device.. There again you have to label it, external power at each 3ph machine.

THE red wire is probably not rated to be open-exposed.. Like a rubber SO, SJ SVO SVJ cord is.. I have pulled THHN down a exposed wire tray, but didn't like it.. On big jobs, thou I have a JW-ICT license to NECA quality work on my own, you do what the guy says who has

David
appreciate your concern , Not goin to stay like that though. The4 pole twist lock is the way to go , . wanted to get it powered up to adjust blade clearance.
Thanks again Larry

[Dawai]

Hi.

I did have a whole box full of them twistlocks..
They are pricy at Lowes ($35) and Home depot, but pretty reasonable on ebay. I had a buddy who works in a plant give me a whole box they discontinued use on. THEM silly maintenance men unplugged them while under power (made lovely sparks and burned up plugs).. the Neca code allows for a plug instead of a "local disconnect" to remove power to make it safe..

I apologize I was not more help. I'll try harder next time. (nobody ever said I was perfect)

[larry mullen]

No problem david ,Its all good mate .
larry