CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice.

Posted by Henrik Olsson
on 2008-09-25 10:57:16 UTC
Hello again,

I've now tried powering the encoder with a separate 5VDC power supply, a
1000uF capacitor across the powersupply terminals and a 1uF MKT cap right on
the encoder. That didn't help....

I checked the encoder and there is NO termination across the signal-pairs on
the encoder, perhaps that's why it seems to work "better" (but still not
working) when I add "my" termination in // with the SN75115's internal.

Is it possible that the lack of termination at the "encoder end" of the
cable is causing this even if I add the resistor-cap termination 300mm away
from the encoder? If so, why the heck isn't it inside the encoder where it
should be...(?)

Moving on, I rearanged my wiring so that I now have a 'true' star-point.
I'll try with words to describe how it's setup:

* Heatskink of UHU connected to GROUND/EARTH/PE - one single screw serves as
my start point here.
* Motor supply (130VDC) negative connected to starpoint.
* Motor housing connected to starpoint.
* Motor cable shield connected to starpoint and *only there*.
* Logic supply for UHU (15VDC) -ve connected to starpoint.
* Encoder supply (5VDC) -ve connected to startpoint.
* UHU motor supply input -ve connected to starpoint
* UHU logic supply input -ve connected to starpoint
* Separate +5V feeds the encoder, it does no longer get its power from the
UHU.
* Encoder -ive connected to starpoint
* Encoder cable shield connected to starpoint.

At first I didn't have the encoder GND and shield connected to star-point
but instead to GND in the connector on the drive, it didn't work. So I moved
both of them to the star-point but that actually made it worse - many more
invalid transitions in a short time.

Now, as I see it the ONLY ground-loop that may exist is the onboard GND-link
between logic level GND and motor supply GND.

I've ordered a couple of 26C32's but they'll probably won't arrive untill
after the weekend.

Best regards,
/Henrik.

Discussion Thread

dcassyc1 2008-09-23 09:32:32 UTC bevel feature for plasma cutter Henrik Olsson 2008-09-23 10:48:22 UTC Major encoder trouble, need advice. Jon Elson 2008-09-23 19:27:16 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Henrik Olsson 2008-09-23 23:02:05 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Jon Elson 2008-09-24 09:54:23 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. David G. LeVine 2008-09-24 10:44:13 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Henrik Olsson 2008-09-24 11:11:18 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Bertrand Cote 2008-09-24 14:48:13 UTC Re: Major encoder trouble, need advice. Bruce Tunnicliffe 2008-09-24 14:48:27 UTC RE: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Jon Elson 2008-09-24 19:40:06 UTC Re: [CAD_CAM_EDM_DRO] Major encoder trouble, need advice. Patti 2008-09-24 21:11:28 UTC Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-24 22:28:13 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-25 10:57:16 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. William Newell 2008-09-25 14:01:17 UTC RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Michael Fagan 2008-09-25 14:15:20 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-25 14:28:01 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-09-25 14:52:47 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. woodwelder@c... 2008-09-25 16:01:04 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-26 05:30:31 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. cnc002@a... 2008-09-26 07:02:17 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-26 07:45:12 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. cnc002@a... 2008-09-26 08:58:02 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-26 09:44:00 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Alan Marconett 2008-09-26 09:56:16 UTC RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-09-26 10:53:04 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-09-26 11:02:58 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. cnc002@a... 2008-09-26 14:44:20 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-27 09:07:17 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. cnc002@a... 2008-09-27 11:13:43 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-09-27 12:43:23 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-29 13:30:22 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-09-29 18:14:15 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-09-29 22:21:01 UTC [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Russell Dunn 2008-09-30 06:45:42 UTC Re: Major encoder trouble, need advice. Jon Elson 2008-09-30 08:10:05 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. cnc002@a... 2008-09-30 09:47:52 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jcullins 2008-09-30 10:04:52 UTC RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. H & J Johnson 2008-09-30 10:27:55 UTC Re: RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Yahoo 2008-09-30 10:56:39 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Matthew Tinker 2008-09-30 21:26:05 UTC Re: RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Bengt 2008-10-01 01:23:29 UTC Re: Major encoder trouble, need advice. gcode fi (hanermo) 2008-10-01 03:38:21 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jcullins 2008-10-01 06:23:18 UTC RE: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Yahoo 2008-10-01 07:49:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Jon Elson 2008-10-01 10:43:16 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. gcode fi (hanermo) 2008-10-01 11:24:18 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Mark Bingham 2008-10-01 14:13:47 UTC Re: Major encoder trouble, need advice. Yahoo 2008-10-01 15:33:41 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. H & J Johnson 2008-10-01 15:44:03 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Yahoo 2008-10-01 16:10:28 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. H & J Johnson 2008-10-01 16:45:39 UTC Re: [CAD_CAM_EDM_DRO] Re: Major encoder trouble, need advice. Henrik Olsson 2008-11-26 10:40:25 UTC Re: [CAD_CAM_EDM_DRO]Major encoder trouble, need advice. Jon Elson 2008-11-26 19:22:13 UTC Re: [CAD_CAM_EDM_DRO]Major encoder trouble, need advice. Dan Mauch 2008-11-26 22:38:23 UTC Re: [CAD_CAM_EDM_DRO]Major encoder trouble, need advice. Henrik Olsson 2008-11-30 07:27:26 UTC Re: [CAD_CAM_EDM_DRO]Major encoder trouble, need advice.