Nubie G251 Assembly Question

[rlrhett]

I just receive three brand spanking new G251. Now what?

OK, I'm not really that lost. My real question is whether anyone has mounted these in an enclosure? Can anyone recommend a good enclosure and suggest a good layout? Did you use stand off screws? Where did you mount a fan? Basically, if anyone has a picture of their G251 set up with a parts list I would really appreciate it.

How about a power supply? A BOB? Recommendations for these tiny little controllers?

I am going to use this on a belt drive system, meaning I need low end torque that rarely will it spin fast. I intend to wire up some bi-polar motors 285oz in series, rated at about 2.1A/Phase. Will a 24v/6.3a power supply be enough? Should I get one rated at a higher a? Higher v?

Thanks!

[rlrhett]

Nothing?!! Nobody has built a system with these controllers?

How about Marris? Can you make recommendations of power supplies, BOB, enclosure and layout? Can you at least comment on whether the proposed power supply would be adequate?

Thanks,

[crocky]

Can't help with your queries yet? but....

I have the G251's and I am waiting for a 48volt/7.5amp switching supply for them. I am getting the Keling 285 Steppers for them and a BOB from them as well.

Greolt has them working on his widgetmaster with a 24 volt supply so I guess it works with one and I did mention your post to him.

[tumutbound]

Sorry I can;t help, still designing my setup.
I have G250's which require a PCB assembly to mount them (similar to a G540). The power supply I have is a 48V 12A, steppers will be similar to Keling 270oz-in - same spec but different supplier.

[Senna]

Be certain to read this ALERT...G251 documentation error and correct page one of your Gecko manual if you were sent a Rev 7, July 27, 2008 version.

Senna

[rlrhett]

Originally Posted by Senna Be certain to read this ALERT...G251 documentation error and correct page one of your Gecko manual if you were sent a Rev 7, July 27, 2008 version. Senna

Wow, thank you. I was sent the old manual. I would have been seriously bummed.

[rlrhett]

crocky and tumultbound,

You both are going with 48v power supplies. Can I ask why? I notice, for example, that the probotix, xylotex, hobbycnc and keling kits all come with 24v power supplies. Also, crocky is going with 7.5 amps and turmultbound is going for 12 amps. Yet both are using the same motors. How do you know how many amps you need?

Thanks,

[crocky]

Originally Posted by rlrhett crocky and tumultbound, You both are going with 48v power supplies. Can I ask why? I notice, for example, that the probotix, xylotex, hobbycnc and keling kits all come with 24v power supplies. Also, crocky is going with 7.5 amps and turmultbound is going for 12 amps. Yet both are using the same motors. How do you know how many amps you need? Thanks,

Hi rlrhett,

I got the data from John at kelinginc.cnc and the drives I have bought are the set that he sells with the 540 and the power supply is the one recommended by Geckodrive

http://www.kelinginc.net/KL23H276-28-4B.pdf has the specs for my motors.

PS. Just read the message about connections and I have the old doco too!

[ger21]

Originally Posted by rlrhett I notice, for example, that the probotix, xylotex, hobbycnc and keling kits all come with 24v power supplies.

The reason is that the Xylotex and Probotix are limited to about 30 V, and 24V is the most common size close to 30V.

Originally Posted by rlrhett How do you know how many amps you need? Thanks,

2/3 of the motors rated current. For example, you need 2 amps for a 3 amp motor. 2/3 x 3 = 2 amps.

[tumutbound]

Originally Posted by rlrhett crocky and tumultbound, You both are going with 48v power supplies. Can I ask why? I notice, for example, that the probotix, xylotex, hobbycnc and keling kits all come with 24v power supplies. Also, crocky is going with 7.5 amps and turmultbound is going for 12 amps. Yet both are using the same motors. How do you know how many amps you need? Thanks,

The G250's are rated for 50V hence the 48V supply. The reason for the 12 A rating is that was the only one available from my supplier.

[rlrhett]

Originally Posted by ger21 2/3 of the motors rated current. For example, you need 2 amps for a 3 amp motor. 2/3 x 3 = 2 amps.

Of each motor, or all motors? For example, if I have three motors rated at 2.1amps, do I need a power supply 4.2 amps?

Thanks!

[ger21]

I come up with 4.4, but yes, in the example I gave before, it was 2 amps per motor.