Service call this morning - the lathe won't start - trips breaker.... Low voltage 3 phase.

Lathe is a TOS (Chech Republic) - no real US dealer - they bought it used several years ago. It appears that it is set up for a manual changeover - operator says "We start it with this switch pointing toward the Y, and then flip it to the Delta (symbol) With pride, he says "It's a soft start.", and then hit the Start/Stop buttons - breaker trips.

One section of the the 4 section "drum switch" seems to be bad - found burned lead and the switch doesn't "feel right" -

If that's right, it gets 3 phase Y for start, and only 2 phase delta for run.

Thinking about replacing it with a US switch, but need the configuration - Chech diagrams not a lot of help.....Euro conventions for symbols and Chech notes.... It seems to be a 4 section switch, with each section having 2 pairs of contacts.

Anyone familiar with maual Y-Delta starting? Customer is chasing a new part thru the used equipment dealer.....but I'm doubtful.......

Thanks for your help / suggestions.

[This message has been edited by grover (edited 07-28-2006).]