On Mon, 16 Apr 2012, Andrew wrote:
Date: Mon, 16 Apr 2012 16:58:04 +0300 From: Andrew <parallel.kinemat...@gmail.com> Reply-To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] BLDC on 7i43 + 7i39 + linear motors16 ???????????? 2012 ??. 16:44 andy pugh <bodge...@gmail.com> ??????????????:
On 16 April 2012 14:34, Andrew <parallel.kinemat...@gmail.com> wrote: > 9 - Z (always 4.2V) It might be that the encoder polarity is wrong. You could try inverting the relevant 7i43 pins (I think that is possible).
Thought about it. But for quadrature signal it does not matter much, does it? Just would be inverse direction or something. I guess I need the o-scope to look what's going on at 7i39 encoder connector, not on 7i43 pins... the problem must be there. Because with another encoder (the same model) I get some different pulse trails, with almost-quadrature signal for one direction (wrong scale, though), but opposite direction fails again.
In the last resort, I could connect the encoders to 7i43 pins directly. But I would not like to cut the cable yet, it's just wrong. Maybe some other solution comes up.
Andrew
Sure sounds like a pinout issue of some kind (the encoder input circuitry of the 7I39 is very simple , a ~1 Usec RC followed by a 74HCT14 Schmitt trigger)
I will check the manual later today and send you a schematic if you like. Peter Wallace Mesa Electronics
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