more data ( Re: 2 Fried G210's in a single day :-(

Hi Paolo,

a varistor in the mains would allow you to test, but like you said,
not every test finds every bug.

at lower voltage/current, you might not have passed the jiggle test.
Jiggling every part, wire, connector belt and pulley might have
exposed that poor connector.

and regarding design, if everything is working perfectly, you haven't
added enough features yet.

bty, do you put in led's across the fuses ? makes it easy to spot a
bad fuse and offers you that warning that the circuit is hot.

Dave

--- In CAD_CAM_EDM_DRO@y..., "pavel59" <pavel@k...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., "studleylee" <indigo_red@q...> wrote:
> > Hi,
> > Just curious, but what supply voltages are you guys running these
> at?
> >
>
> If I well remember (I'm not in the workshop now) I'm running on 72V
> and I have a 15.000 uF dump capacitors. Each Gecko is properly set
> to the current requested (about 4A) and has its own cap on the
power
> in. Everything is protected by fuses.
>
> All the problems I had appeared to be due to false contacts on
motor
> leads (two times) or a spike on the motor connection when plugging
> the fuse into its socket (the caps were still loaded ... ).
> The first time the false contact was caused by a defective fuse
> holder.
>
> This third and last time the problem is related to a regularly
> plugged (but not locked) connector. I feel these connectors don't
> ensure a stable contact if the outer ring isn't fully locked to the
> end. And this one didn't want to lock, don't ask me why, like the
> thread was obstructed in less than one turn.
>
> I appreciate the suggestion of testing them at lower voltages and
> amps, but it wouldn't work in my case.
> When you finally switch to the bigger supply, it's again matter of
> contacts, wirings and connections. That's where I had my issues.
> And my power supply is not a variable one, it only has the
requested
> voltage. What should I do ? To change the transformer ? and the
> voltage regulator ? and what else ?
>
> I'm a product designer and in my job I know an important rule:
every
> product should be designed with a reasonable fault tolerance. You
> can't push a design to its limits and consider that as its working
> range. The only complaint that I have now is about the G201 fault
> tolerancy, which is not.
> All the rest is very nice but I feel they should be a little more
> robust.
>
> Paolo