Re: [CAD_CAM_EDM_DRO] gecko burned again

Jon
You have an excellent point. Keith could probably test this with a new
Gecko. He should just add the correct amp fuses to the motor drive lines.
When one fuse pops he will probably find you are correct.

Your comments also bring up another great point to consider . Fuses and
fuse holders are cheap compared to driver boards as well as computers. I've
been a ham radio operator for a long time and over the years fuses have
saved me thousands of dollars worth of equipment when a power supply or a
transformer went south on me. Old "Buss" and me are great buddies.

John

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, November 07, 2004 1:26 PM
Subject: Re: [CAD_CAM_EDM_DRO] gecko burned again


>
> Keith Clark wrote:
>
> >Well, the y axis gecko drive burned again this morning. This time
> >there are no loose wires. I was doing very little with the machine
> >and had just turned it on when during a y axis G0 move, the drive
> >burned up. I assume this is an indication that the Gecko cannot
> >handle the motor I am using. This is an old topic and I have asked
> >for help with this problem before. The mill is a Bridgeport Series
> >1 CNC originally controlled by Boss 6 but now using Anaheim Nema 42
> >high torque stepper motors and Mach2 software with a Campbell
> >breakout board.
> >
> >At this point is seems reasonable to try another brand drive?
> >
> >
> I think you need to retire that MOTOR. There is nothing wrong with
> the Gecko drive, when used with good motors. But, one of its weaknesses
> is that shorts to ground, or just plain internal shorts in the motor
> windings
> will pop transistors in the Gecko drive. I think you'll find the Rutex,
> Xylotex,
> etc. drives all have this same weakness. After blowing TWO Geckos on
> the SAME motor, doesn't that tell you something? Why didn't the X or Z
> drivers blow? Why always the Y axis?
>
> Explanation: Your Y motor has an intermittent short. How much you are
> doing with it doesn't make much difference. I assume the motors heat
> up, even when idling. The heat probably causes the short to develop
> every once in a while, when the winding expands from the heat.
>
> Jon
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>