Hello, first off , after doing a spindle warm up to 4000 rpm on the slow down there was a loud bang, alarms on, regen. (power surge ?)
X drive servo motor would not work. alarms.
Found blown capacitors & fuse on the amplifier for X servo motor
Fixed board with new capacitors, mill runs for one day.

Today warm up spindle, then regen elements were glowing red ! shut mill down to stop it. Something was wrong, never seen this before.
Start up mill again, shows alarm on , doesnt say what for, Then I heard a click in the back panel and now see smoke coming from panel. Shut down mill, shut off breaker.
Look in back panel, 320V power supply was smoking, something burnt on board. Will get pics soon.

Any idea what happening ?

Thanks Ted,

Sorry added to lathes not to mills... tried to delete not luck ...