The machine is a BMC30 ultimax3 from 1997 with Siemens drives.
After failure of the power unit (atx type since 15 years), I replaced it with a similar type delivering the same voltages; +12,2V 4.88V -12V 24V (they can't be set).
When starting up all goes well untill the start button is to be pushed in. When pushed no motor sounds appear, only a slight relais-switching sound in the electronics cabinet(relais ALR and FOR are switched on). Then 3 relais led's are lighted COR , ALR and For on the control relay board.
Trying to jog or turn the spindle on, only results in error messages and switching off of the control power.
Reseating and/or repositioning of any cards does not change anything. Several cards I have duplicates of and with them installed the result is the same. No end-switches are active.
I have run out of ideas what to do next.
Any suggestions please.