Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Leonardo Marsaglia]

2016-04-24 23:06 GMT-03:00 Ken Strauss :

> Note that if you Google for the model number there are a number of people
> selling them. Is it possible that it is not a standard Heidenhain product
> but a special for an OEM who went bankrupt or cancelled the project and
> they
> are now being dumped?
>

Yes indeed, nothing appears. The person selling them says in the
description that they are two channel encoders. I asked him if this means
they only have A and B pulses, or if this means A, B and Z but with
differential outputs. He answered they are A, B and Z but I have no answer
about if they are differential (I asked him again about that and I'm still
waiting). Judging by the number of pins available on the connector is more
than likely that they are differential but I'm not sure off course.


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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Ken Strauss]

Note that if you Google for the model number there are a number of people
selling them. Is it possible that it is not a standard Heidenhain product
but a special for an OEM who went bankrupt or cancelled the project and they
are now being dumped?

> -Original Message-
> From: Leonardo Marsaglia [mailto:leonardomarsagli...@gmail.com]
> Sent: Sunday, April 24, 2016 9:47 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Semi OT: Heidenhain incremental encoders
>
> 2016-04-23 19:14 GMT-03:00 andy pugh <bodge...@gmail.com>:
>
> > The description says that they are normal TTL output, and that he has
> > the pinout available.
> >
>
> Since I can't find any documentation I'm gonna ask him for the pinout so I
can
> decide. It's weird anyway that I can't find anything from heidenhain
directly.
>
>
> --
> *Leonardo Marsaglia*.
>

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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Leonardo Marsaglia]

2016-04-23 19:14 GMT-03:00 andy pugh :

> The description says that they are normal TTL output, and that he has
> the pinout available.
>

Since I can't find any documentation I'm gonna ask him for the pinout so I
can decide. It's weird anyway that I can't find anything from heidenhain
directly.


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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[andy pugh]

On 23 April 2016 at 22:29, Leonardo Marsaglia
 wrote:
> That's what I was not sure about them. And I can't find the manuals of
> these series so I can't check wheter I can wire them directly as TTL or if
> I need that interpolator box to make them work.


The description says that they are normal TTL output, and that he has
the pinout available.

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Leonardo Marsaglia]

2016-04-23 18:44 GMT-03:00 Nicklas Karlsson :

> The common ground is a problem but it also depends on cable length. Basic
> problem is then there is a flank on one of the signals ground bounce in the
> receiving end. With differential signals ground current stay there it is
> and it will not affect the other signal.
>
>
Well the longest cable would be approximately 2 meters long. I guess to be
sure I will go with differential.


> You also need a differential receiver. It is important current at
> transitions are between differential signals and not the ground.
>

I'm planning to use the Mesa 7i33 that I have bought but never used so I
have the option of driving normal encoders or differential ones.

Thank you Nick!


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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Nicklas Karlsson]

> Anyway my only doubt now is how much better are differential encoders
> compared to normal ones. I always used normal encoders with no signs of
> noise but since this is for a lathe with 0.01 mm increments I would like to
> go with the safest option.
> 
> As always Andy, thanks you!

The common ground is a problem but it also depends on cable length. Basic 
problem is then there is a flank on one of the signals ground bounce in the 
receiving end. With differential signals ground current stay there it is and it 
will not affect the other signal.

You also need a differential receiver. It is important current at transitions 
are between differential signals and not the ground.


Nicklas Karlsson

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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[Leonardo Marsaglia]

2016-04-22 14:05 GMT-03:00 andy pugh :

>
> Heidenhain mainly do sin/cos encoders and one uses an interpolation
> box to convert to TTL.
> I suspect that these encoders have a built-in 25x interpolator to give
> the 5000ppr.
>
> The price looks great, especially including the fancy mounts.


That's what I was not sure about them. And I can't find the manuals of
these series so I can't check wheter I can wire them directly as TTL or if
I need that interpolator box to make them work.

There's another link with a gorgeous Allen Bradley encoder but they only
have one.

http://www.ebay.com/itm/ALLEN-BRADLEY-845H-SJDZ14DRY2C-Optical-Incremental-Encoder-5000-PPR-Type-4-13-/281274676932?hash=item417d46f6c4:g:w0gAAOxy0bRTDnbv

Anyway my only doubt now is how much better are differential encoders
compared to normal ones. I always used normal encoders with no signs of
noise but since this is for a lathe with 0.01 mm increments I would like to
go with the safest option.

As always Andy, thanks you!



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*Leonardo Marsaglia*.
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Re: [Emc-users] Semi OT: Heidenhain incremental encoders

[andy pugh]

On 22 April 2016 at 17:51, Leonardo Marsaglia
 wrote:
> My doubt is that in the label it says TTL x25 wich I don't know what it
> means. Is this a multiplication factor?

Heidenhain mainly do sin/cos encoders and one uses an interpolation
box to convert to TTL.
I suspect that these encoders have a built-in 25x interpolator to give
the 5000ppr.

The price looks great, especially including the fancy mounts.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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