Wye/delta question

[licensed to chill]

Does anyone have a sequence of operation for a closed transition wye/delta starter assembly?

thanks

[pringlel]

This shows a decent electical diagram, with some good info, I will look to see if i can find one that actual explains each step
http://static.schneider-electric.us/docs/Motor%20Control/Contactors%20and%20Starters,%20NEMA%20Style/Reduced%20Voltage,%20Wye-Delta/Size%206,%20Type%208630SH/50006-026-01E.pdf
also http://www.abb-control.com/pdf/catalog/lv023/3.83.pdf

[Octopus]

http://www.google.com/imgres?imgurl=http://hvac-talk.com/vbb/image.php%3Fu%3D22414%26dateline%3D1269655086&imgrefurl=http://hvac-talk.com/vbb/showthread.php%3Ft%3D292282%26page%3D2&usg=__AY9gYIjAf36Pru1XquD5WlDPEOk=&h=113&w=150&sz=6&hl=en&start=18&itbs=1&tbnid=BBZjRevvw5ROKM:&tbnh=72&tbnw=96&prev=/images%3Fq%3Dclosed%2Btransition%2Bwye/delta%2Bstarter%26hl%3Den%26gbv%3D2%26tbs%3Disch:1

POST 16

[Randy S.]

One thing to add:

Land the line leads on the main contactor so the jumpers don't see starting current. Replaced many toasted jumpers where they landed on the delta contactor.

[deltap10]

Shorting contactor pulls in. No current flowing at this time. Start contactor pulls in and motor accelerates in Y. Older models time acceleration - newer models shift when cts sense a drop in amps. Shorting contactor drops out and at the same time resistor contactor and run contactors pull in. Resistor contactor is in only for duration of the shift-milliseconds. Motor is now running in Delta. Transition complete aux. contact signals control panel start is complete. Vanes begin to open in leaving chw control.

[allchlrstech]

I HAVE SOMTHING BETTER,JUST CANT FIND IT RIGHT NOW.

[pringlel]

I HAVE SOMTHING BETTER,JUST CANT FIND IT RIGHT NOW.

Good stuff,thanks for sharing :)

[Screwit]

Wye delta starter sequence attached

[licensed to chill]

Thanks for the links, answered all my questions

[Doesn'tPhaseMe]

Here is a thread from a few months ago.
http://hvac-talk.com/vbb/showthread.php?t=516502&highlight=delta