Re: [CAD_CAM_EDM_DRO] Re: Gecko burned out

Jon Elson <elson@...> wrote:

walid wrote:

>
>Dear jon
>
> How can I protect my gecko drives in case of motor loose wire
>
>

Buy a more expensive drive that is designed to tolerate abuse.

///It seems that the majority of posts regarding damaging a Gecko pertain to the stepper motors drives. Stepper motor drives are much more complex. Steppers are pulsed at 10 -20 times their rated voltage. Then the voltage is chopped to rated voltage at idle/hold. Seems like a recipe for problems. I use the Gecko 320 servo drives and they are one tough little beast. Just the other day I was drilling holes all day with the Gecko whipping the knee of my Bridgeport up and down peck drilling and the servo warmed up but the Gecko stayed nice and cool on the heatsink under the fan. When I was doing my retrofit, I layed a Gecko320 down next to one of my Nema 42 servos and was not convinced it was going to work. It's tiny in comparison. My motors were 4.2" diameter X 17" long body, a bit shorter since I removed the brake. There are pics of my machine on the CNC-pics group at yahoo. Yes, Gecko 320's control those servos with rapids on X an Y of 120 ipm and 60 ipm on Z. Much to my amazement.
I'm sold on them and wouldnt even consider using any other drive. 15 months of continual use and not one problem. I was concerned at first about getting into the middle of a job and not being able to complete it because of a possible drive failure. I've become very complacent about their reliability. I even designed the enclosure so the drives on their heatsink easily slide out of a slot in like a tree in front of the fan because I thought I would be changing them occasionally. Waste of time.

Ron

None of
the low-cost
hobby-market drives are built with the kind of circuits that will
prevent this
kind of damage. I can't recommend any specific models. I don't know which
makes/models might have such sophisticated safety controls.

Jon



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