Hi all,
I have been running 3 geckos for some time using 2 36v switching psu's without problems. (or so I thought) I noticed that my X axis had lost power and found that one of the psu's had died and I was just getting 36v output. It appears that these things don't like being in series! To sort this out I used a variac which cranked up to 74v and fitted a rectifier and caps etc. All well and good, until I touched my mill and the controller box at the same time. Result-------200v kick! On measuring I found 200v plus on my controller box chassis Includes heatsinks as they are directly mounted to chassis I tried grounding everything correctly and thought this would sort it. All I achieved was to trip the mains earth leakage. I disconnected all 4 gecko's (original 3 plus new one for dividing head) and this voltage dissapeared. I replace the psu with the 36v switcher...... no problem! How can one psu setup do this and another not. The variac psu does display some ripple, can this cause such problems!
Best regards
Les.
PS Best wishes to everone for the festive season.