Re: [CAD_CAM_EDM_DRO] Heidenhain encoder:Trash or Treasure?

Would you be willing to sell that heidenhain encoder?
Please let me know. Thanks.



--- Jon Elson <elson@...> wrote:

> Donald Brock wrote:
>
> > I'm in need of some qualified help to determine if
> I have trash or
> > treasure on my hands.
> >
> > A servo motor was replaced on our shops Fadal VMC
> some months ago and
> > during a shop cleanup two days ago the motor was
> tossed into the
> > dumpster. I recovered the motor from the dumpster
> and removed the
> > encoder from it last night. I have every reason to
> believe the
> > encoder to be fully functional.
> >
> > The encoder has 12 wires to a PCB connector and is
> labled as follows:
> >
> > ROD 426.060B - 8192
> > Id. No. 316 590 02
> > S. No. 7 100 250 U9(not part of the s. no.)
> >
> > So far I have been able to determine that it is 5V
> w/TTL output.
> >
> > A lookup on the Heidenhain web site give a color
> code for the 400
> > series but the wire color code in the chart
> doesn't quite match what
> > I have here. It does somewhat but not 100%.
> >
> > There is also not enough info on the web site to
> tell me how many
> > lines the encoder is.
>
> I would guess it is 8192 cycles/rev, or 32768
> quadrature counts/rev!
> WOW!
>
> >
> > Questions are:
> >
> > Will I be able to make benificial use of this
> encoder?
>
> Most likely.
>
> >
> > Any info on this unit or assistance in how I can
> hook it up to make
> > use of it would be appreciated.
>
> If you can figure out the +5 and ground (look for a
> few capacitors
> connected across these two wires) then you can
> probably figure
> out the rest. With 12 wires, it is most likely
> differential, with
> commutation
> signals for brushless motors. You probably have no
> need of the
> commutation signals, they would be the ones that
> change only a few
> times per rev. The A and B quadrature channels
> would be changing
> if you just touch the shaft, at that resolution.
> The differential lines
> of each channel would always be the exact opposite
> of each other,
> so you can figure those pairs out. The last signal
> is the index, which
> only ocurrs once per revolution, as a very short
> pulse, and is pretty
> hard to catch. This accounts for 11 signals. The
> 12th wire could
> be either a fault signal or a shield ground.
>
> Jon
>
>
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