Re: [CAD_CAM_EDM_DRO] Re: Xylotex Pwr Sup replacement

G540 and its G251 X "single" counterpart are both limited to 50V in,
max. That's enough to max out basically any NEMA23 style. More voltage
will not improve the drive at that point, in fact, you can get an
undesirable ripple because the PWM current rises too quickly. It's the
opposite edge of the problem- too little voltage and the current rises
too slowly to meet the target, too much voltage and the current rises so
quickly it's not possible to control within spec at the PWM freq used.
The Geckodrive manual contains guidelines on maximum voltage for a given
motor inductance. In general, 48V is just dandy for the modern
low-voltage NEMA23's.

The G201 series- which includes the G210X and G213V- can do 80V input,
and have 7A outputs. They're more suited for NEMA34 motors. Even if
you put it on a NEMA23, you might want to limit the voltage to 48v for
the same reason.

Danny

On 11/13/2011 7:46 PM, turbulatordude wrote:
> if you are going to use a Gecko, why underpower it with 48 volts ?
> it can take 65 volts to the motor quite easily. a 48 volt transformer will offer about 65 volts and make the units work great.
>
> although I have only ever used about 20 of them, I usually run them at about 35 volts. nice and cool and my motors have plenty of power to move things around at a very crisp pace.
>
> Dave
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Danny Miller<dannym@...> wrote:
>> No one who has put a Geckodrive on a 48v 7.3A power supply has ever
>> regretted it. They DO regret the time they wasted with obsolete drive
>> tech that doesn't cut it for CNC use.
>>
>> It's totally worth it. If you don't have modern low-voltage steppers,
>> you might wanna look at replacing those too.
>>
>> G540 is about $250... a little pricey, but not that pricey considering
>> how much better they are than anything else.
>>
>> Danny
>>
>> On 11/13/2011 1:02 AM, ebiz_59 wrote:
>>> Murphy bit the Xylotex box on our minimill tonight. It appears as though the 24V 6A power supply gave up the ghost - just when we were FINALLY making our first part for our FTC robot.
>>>
>>> So I need some ideas for replacing this power supply quickly. I think I saw a 30V power supply on an HP printer the other day, but I'm thinking it was only a couple amps. And I think I might have a 15-20V 4ish amp laptop supply lying around.
>>>
>>> Any other thots? And what are the odds that the Xylotex drives are OK if this power supply board is only putting out like 1.5V? Should I be looking for another set of stepper drivers too?
>>>
>>> Ugh! Chuck
>>>
>>>
>>>
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