Request for assistance with Gecko and LARGE servo motor...

Hi people.

I've got a LARGE (ie 3HP @ 120VDC) servo motor that powers a 200+ pound
table via a direct drive (4TPI) ballscrew. THe motor is equipped with a
250 count quadrature encoder and I'm driving it with a Gecko G320.
We've got an 80V power supply supplying the system.

We run 2 similar but smaller motors (ie 2 HP) on other axes, powering as
large or larger loads (without any problems).

The problem with the LARGE servo motor is that we blew up a G320 trying
to get it to run properly. The drive would operate the motor at slow
speeds, but not entirely correctly. The motor ran as though the damping
was incorrectly adjusted, ie kind of rough. I spent all kinds of time
trying to get the damping and gain set correctly, but it still ran
rough. And then the drive blew.

Any ideas as to why this could be happening ?


--
Kim Lux <lux@...>