Current Set Resisitor for G212

[bkkpool]

I am trying to determine the current set resistor for the G212. I have a 48V 10A unregulated power supply and I am using these motors wired bipolar parallel. These are rated at 2.8A/phase when wired bipolar parallel. Does that mean that I use a 16 kohm resistor?

http://www.kelinginc.net/KL23H286-20-08B.pdf

Any help would be appreciated.

[ger21]

I see 47*2.8 / (7-2.8) = 33Kohms according to the formula in their docs. Right?

[bkkpool]

That is the calculation that I attempted. It was difficult.

[bkkpool]

What should be the power rating of these resistors?

[massajamesb]

5% 1/4 watt resistors from Radio Shack work just fine (1/2 watt will work just as well), I have a similar Kelinginc stepper on my 201 gecko. I believe I picked them up from Radio Shack at 1 dollar for 5 resistors. Hope that helps!

[Willbird]

OK so lets see if I understand this right, the formula in my G210 literature I downloaded from the gecko website is

R = 47 * I / (7-I) for the high range 1A to 7A

So the specs for the Keling KL34H2120-42-8B say

Unipolar 4.2 amps (amps is I ?) 4.7 volts
Bipoar series (that means Bipolar I assume) 3.0 amps 6.7 volts
Bipoar parallal 6.0 amps 3.5 volts


Using the formula I got

Unipolar 70.5 Kohms
Bipolar Series 35.3 Kohms
Bipolar parallal 282 Kohms

looking at some other posts leads me to belive these results are right.

Bipolar parallal with a 220Kohm 1/4 watt 5% radio shack resiter should give me 5.77 amps, a 315Kohm would give 6.09 amps, those are the closest two choices Radio Shack lists

Bill

[dertsap]

http://www.luberth.com/cstep/hardware.htm

scroll down to the bottom of the page for the gecko resistor calculator

makes things simpler

[Willbird]

I took som e pride in solving the problem myself (with help from rtfm and cnczone), the link posted is a nice double check tho :-).


Bill

[Willbird]

http://www.weethet.nl/english/hardwa...calculator.php

There is a very handy little utility

Also Radio Shack part # 271-312 Had resistors very close to what I needed for my steppers.

http://www.radioshack.com/product/in...entPage=family

Bill

[Willbird]

http://www.geckodrive.com/photos/G201_REV-5_MANUAL.pdf

I just noticed tonight that the instruction manual has a picture of the drive, which has the resistor values listed right ON the drive, DUH :-).

I should have a shiny new 201 to look at soon, should be in my mailbox this week :-).

Bill

[pastera]

http://www-k.ext.ti.com/srvs/cgi-bin/webcgi.exe?Company={5761bcd8-11f5-4e08-84e0-8167176a4ed9},kb=analog,case=obj(33635),new

Parallel resistor calculator - calculates two standard resistors that will parallel to give an arbitrary resistance.

Aaron

[Willbird]

Well if you calculate what the end result is from a standard resistor, the amperage is so close it isnt worth a lot of fiddling to fine tune it to .1 amp or less. In my opinion anyway 5.9x amps is gonna work just as good as 6.0.