Re: [CAD_CAM_EDM_DRO] Re: Servo only moving one way

Robin
We have over 200 boards in the field with only one chip failure and I
think that was customer induced. So yes you should be fine, I am changing
over because Marris suggested it. It is about 2x the cost to me but
satisfying someone like Marris is important to me. He is an outstanding
engineer, so I want question his expertise.
Marris's quote.
"
Most (>90%) of our drives operate with only 7mA of LED current. I
always design using a component's minimum guaranteed specification
and then some. The 16mA spec is listed in our data sheet."

The 7ma is well in the operating range of the chip that is in your board.
Having the extra drive is good if you are pushing the upper speed limit.
Fear not, if the chip fails we will replace it for you.
Thanks
Jim

----- Original Message -----
From: "INDECO" <indeco@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, March 13, 2004 7:38 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo only moving one way


> Jim,
>
> Will I be ok with what I have ? or should I order a new board with the
new
> 74ACT541 part.
>
> Robin
>
>
>
>
> ----- Original Message -----
> From: <james_cullins@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, March 12, 2004 5:37 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo only moving one way
>
>
> > I just ordered 100, I didn't realize your optos used that much current.
> > Jim
> > ----- Original Message -----
> > From: <james_cullins@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Friday, March 12, 2004 4:28 PM
> > Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo only moving one way
> >
> >
> > > Thanks Marris, I'll order some.
> > > Jim
> > > ----- Original Message -----
> > > From: "Mariss Freimanis" <mariss92705@...>
> > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > Sent: Friday, March 12, 2004 3:13 PM
> > > Subject: [CAD_CAM_EDM_DRO] Re: Servo only moving one way
> > >
> > >
> > > > Jim,
> > > >
> > > > I'd strongly recommend you use a 74ACT541 instead.
> > > >
> > > > The 74HCT part has a 7.8 mA current sink capability which is
> > > > insufficient for the 16 mA required by our drives. The 74ACT series
> > > > has well over +/-24 mA output drive. Same pinout, same 1.5V
> > > > threshold, same package. It also makes a dandy 3.3V to 5V level
> > > > shifter to take care of those pesky new parallel port 3.3V signals.
> > > >
> > > > Mariss
> > > >
> > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, <james_cullins@s...> wrote:
> > > > > INDECO
> > > > > On the sound Logic board the Led has a separate driver (
> > > > uln2803 ) from
> > > > > the signal (74hct541 ). The LED can work and the signal not work,
> > > > so you
> > > > > need to check on the DIR terminal pin and determine if it is
> > > > changing form
> > > > > 5v to 0.
> > > > > If not please let Bob or me know and we will replace it for you.
> > > > > Jim Cullins
> > > > > Sound Logic
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Jon Elson" <elson@p...>
> > > > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > > > Sent: Friday, March 12, 2004 12:31 PM
> > > > > Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo only moving one way
> > > > >
> > > > >
> > > > > >
> > > > > >
> > > > > > jmkasunich wrote:
> > > > > >
> > > > > > >--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>
> > > > wrote:
> > > > > > >
> > > > > > >
> > > > > > >>INDECO wrote:
> > > > > > >>
> > > > > > >>
> > > > > > >>
> > > > > > >>> Yes I am using Gecko drives with Bob Campbells Breakout
> > > > > > >>>board and Mach 2 software.
> > > > > > >>>I have niether a logic probe or a oscilloscope to check it.
> > > > > > >>>However the direction light on the board is not lit up as
> > > > > > >>>the Y axis is, however the light on the Y only lights when
> > > > > > >>>I jog to the left then goes out when I jog right. Is this
> > > > > > >>>right?
> > > > > > >>>
> > > > > > >>>
> > > > > > >>>
> > > > > > >>That's the way it is SUPPOSED to work.
> > > > > > >>
> > > > > > >>
> > > > > > >
> > > > > > >The "Y" axis is acting the way it's supposed to. But nowhere
> > > > > > >does he say that "X" is doing the same thing as Y,
> > > > > > >
> > > > > > Yes, I meant that the Y behavior was entirely normal, and the
lack
> > > > > > of a light on X was definitely related.
> > > > > >
> > > > > > > in fact he
> > > > > > >says "the direction light on the board is not lit up as the
> > > > > > >Y axis is", so that implies that the X light is _not_ working.
> > > > > > >He previously stated that the problem axis is X, so the dark
> > > > > > >LED points to a computer/parport/cable issue, NOT a drive
> > > > > > >issue.
> > > > > > >
> > > > > > >
> > > > > > Maybe. If the X LED is in SERIES with the LED in the driver's
> > > > > > optocoupler, then a problem with wiring or the driver could
cause
> > > > the
> > > > > > LED on the breakout board to not work.
> > > > > >
> > > > > > Jon
> > > > > >
> > > > > >
> > > > > >
> > > > > > Addresses:
> > > > > > FAQ: http://www.ktmarketing.com/faq.html
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> > > http://groups.yahoo.com/group/jobshophomeshop I consider this to be
a
> > sister site to the CCED group, as many of the same members are there,
for
> OT
> > subjects, that are not allowed on the CCED list.
> > >
> > > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
THEM.
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if
> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
OT
> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
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> >
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[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
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> Yahoo! Groups Links
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