I have my gecko 320 servos hooked up to my power supply 80v They were acting very flaky with step loss and such. and so I did some poking around and found out that the heat sink that they are attached to is hot, as in carrying voltage, and lots of it, enough to where when I touch the heat sink with a ground wire it sparks( not just a little, the sort of spark that is trying to kill you.) There is no power source touching the heat sink other than the gecko drives. When I lift the geckos off the heat sink it is no longer carry a charge( I can touch a ground wire to it and no sparks) So the gecko drives are acting like a positive terminal applied to the heat sink. Anyone had this problem and know whats going on?
Put insulators under the mosfets (mica or other).
Sounds like one of the high side ones is touching the case.
Manufacturer of CNC routers and Viper Servo Drives
www.LarkenCNC.com and www.Viperservo.com