Re: [CAD_CAM_EDM_DRO] Re: Encoder help?

Hi Dan,

Thanks for the info. I think I have all of the encoder issues solved. Here's another question, if you don't mind. How did you solve the Z axis brake problem. When I turn the brake off, the Z axis falls. I think that I need to have the brake off only when the axis is moving, but I am not sure how to do that.

Any help would be gratefully appreciated.

Eric


From: danmauch
Sent: Monday, February 21, 2011 8:49 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Encoder help?



I have rerofitted several techno control units. Both stepper and servo. I'm currently doing a stepper system. The first problem is that the RM15 draws 70MA as shown on the spec sheet. The G320X can can only handle 50MA so you risk burning something out on the G320X is you use it directly. However, you can you an external regulatted 5VDC power supply to run the rm15 encoders.
Simply insulate the wire end coming from 10,11 and 12.a nd not connect them anywhere
Connect the external power supply 5v DC + to the encoder 5V+ terminal and the 5 v PS grond to both the enc- terminal on the G320 and the encoder ground terminal.
Dan Mauch
www.camtronics-cnc.com
stepper and servo motors
enclosre for Gecko products
kit, assembled and cutom systems.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "te_bma" <thayn.eric@...> wrote:
>
> Hello everyone,
>
> I am extremely new to the CNC world. I have obtained a Techno Isel Davinci 3-Axis CNC router from a local High School auction. Upon taking it all home, reading through the documentation and inspecting everything, the main control board has been fried somehow. The servo motors and everything else looks very good, with little usage.
> I have been learning and reading tons of data on the whole thing and have come to the conclusion that my best bet is to rebuild the controls.
>
> I have decided to use Gecko G320X drives and the power supply from the original system. Due to my occupation, most all of this stuff makes perfect scenes. for the most part. My biggest issue is regarding the encoders.
>
> I have a basic understanding of the encoders, the basics of how they
> work, and what they are used for, but my question is regarding wiring and a few functions of the encoders.
> After carefully disassembling the servo and covers to get part numbers, it looks like I have Renco Encoders, P/N 77822-033, D/C 9845. After looking online (a lot), I think that they are RM15's. Looking at the Techno Isel's manuals that came with the unit, the following pin-out was used in their configuration:
>
> 1 & 15 are jumped together as the E-stop loop.
> 2, is the yellow wire on the encoder and is used as the A encoder channel.
> 3, is the blue wire and is used as the B encoder channel.
> 4, is the brown wire and is used as the "I" Index encoder channel.
> 5, is the red wire and is used as the 5v+.
> 6, is tied to a limit switch.
> 7, 8, 9, are not used
> 10, is the encoders white wire and is used as the "not" A (or A with a line over it).
> 11, is the green wire and is used as the "not" B.
> 12, is the orange wire and is used and the "not" I.
> 13, is black and is used as the encoder ground.
> 14, is tied to the other side of the limit switch.
>
> Can someone please help me understand what 10, 11, and 12 are used for and also what is the Index used for. I THINK that it is used for/as the home position, but I am not sure. Reading the documentation for the Gecko drive, I don't see a place to terminate them. Do they need to be used?
>
> I am also using a Breakout combo board from sound logic, which is
> supposed to be a good fit with Mach 3 and the Gecko drives.
> The breakout board doesn't say anything about the Index function either.
>
> Also, are these encoders going to work for my project? I think I am going to have to have an external power supply too.
>
> Thanks
>
> Eric
>





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