but if I measure AC from the capacitors i get some 270V ( for 1-2 seconds, after that the relays deactivate). Is this normal ?
On the DC-side of the rectifier ?
Do you have also checked contacts on KM3 and the 2 10 ohm resistor?
What's about the LED's on the DSQC 314A? Is it green after gives power to the rectifier or red?
Faulty capacitors in the rectifier can destroy the MOS-FET Transistors on the drive units. Have you checked the Transistors with the diode-Function from a measuring device?
Are all transistors on the drive units ok?