(238,’2006-08-10 12:00:00′,’figNoggle’,’2006-12-20 08:03:41′,’david’,’Keling NEMA 34 Step Motors (AKA Steppers) and Gecko G202s Arrived!’,”,’The two NEMA34 frame step motors and Gecko G202s arrived! Initial impression was that the motors are HUGE compared to NEMA23 frame motors (like the ones on the X2 CNC mini-mill) and the drives are small.

The motors are model number KL34H295-43-8B with the following specs:

-990oz.in. holding torque

-4-phase can be wired in parallel, series and unipolar

The Gecko drives are model G202s and basically is the one without half/full step but has short circuit protection.

A power supply needs to be purchased as well. Here’s how we went about finding the “right” one…

According to G202 documentation, a minimum of 24VDC and maximum of 80VDC are the limits that the Gecko will take. Apparently, there’s a linear relationship between power supply voltage and the “high speed performance” of the motor. So “doubling the voltage also doubles the motor’s high speed power” according to Gecko. Since 24VDC switching power supplies can be had for $50 or so from any outlet including Jameco, we looked there first.

After seeing that 48VDC supplies weren’t all that expensive, we decided on that. But what about current supply? Again, the G202 doc says that 67% of the motor’s rated phase current is the maximum the power supply requirement. So, the motor’s numbers come down to this:

Parallel = 6.1A@100% / 4.087A@67%

Series = 3.05A@100% / 2.0435A@67%

Unipolar = 4.3A@100% / 2.881A@67%

This basically tells us that the common 0-2A power supplies would work except in the case of a parallel-wired stepper. So, now we’re off looking for something like a 48VDC 0-5A or similar power supply. Jameco sells MeanWell (what a name!) supplies; model number S-240-48 does the trick! A quick online search found only a few other places that had deals better than Jameco.’

‘,’

The two NEMA34 frame step motors and Gecko G202s arrived! Initial impression was that the motors are HUGE compared to NEMA23 frame motors (like the ones on the X2 CNC mini-mill) and the drives are small.

The motors are model number KL34H295-43-8B with the following specs:

-990oz.in. holding torque

-4-phase can be wired in parallel, series and unipolar

The Gecko drives are model G202s and basically is the one without half/full step but has short circuit protection.

A power supply needs to be purchased as well. Here’s how we went about finding the “right” one…

According to G202 documentation, a minimum of 24VDC and maximum of 80VDC are the limits that the Gecko will take. Apparently, there’s a linear relationship between power supply voltage and the “high speed performance” of the motor. So “doubling the voltage also doubles the motor’s high speed power” according to Gecko. Since 24VDC switching power supplies can be had for $50 or so from any outlet including Jameco, we looked there first.

After seeing that 48VDC supplies weren’t all that expensive, we decided on that. But what about current supply? Again, the G202 doc says that 67% of the motor’s rated phase current is the maximum the power supply requirement. So, the motor’s numbers come down to this:

Parallel = 6.1A@100% / 4.087A@67%

Series = 3.05A@100% / 2.0435A@67%

Unipolar = 4.3A@100% / 2.881A@67%

This basically tells us that the common 0-2A power supplies would work except in the case of a parallel-wired stepper. So, now we’re off looking for something like a 48VDC 0-5A or similar power supply. Jameco sells MeanWell (what a name!) supplies; model number S-240-48 does the trick! A quick online search found only a few other places that had deals better than Jameco.’

‘,”,”,”,’Home-Brewed-CNC-Vertical-Mill’,”,0,”,0,4,1,1,’article’,”,”,’keling-nema-34-step-motors-aka-steppers-and-gecko-g202s-arrived’,”,”,”,”,”,”,”,”,”,”,’3c18ba5d484bf3d4e5061771d5458e29′,’2006-08-10′);