Re: [CAD_CAM_EDM_DRO] Re: gecko burned again

Keith Clark wrote:

>Ron,
>
>It is strange that is works fine for several weeks then starts
>failing. The eventual failure is preceeded by trouble maintaining
>steps then finally a lockup and burned drive. I have the accel and
>rapid speed actually backed down and still had the problem. There
>is a capacitor at the drive as recommended by Mariss from
>Geckodrives. I guess I could buy another Gecko and turn down the
>accel and rapid speed as you suggest and see if it happens again.
>
>What also is strange is that the fuse in the circuit did not blow.
>It is a delay type fuse. Should I switch to a different type of
>fuse?
>
>

Yes. There's no reason to use a delay fuse, but don't expect it to save
the Gecko. You might want to check with Mariss at Gecko and see if he has
an inductance spec on your motors. If not, maybe you can get the winding
inductance spec in parallel connection from the motor's maker, and then
get that number to Mariss. There is a minimum inductance required for
these motors. If these motors are on the margin, it could explain the
eventual failure. Do the Gecko drives run hot after several hours of
operation? If the inductance is too low, then switching to series
connection will probably make it high enough to stop this problem.

Jon