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

Mariss

Ok. We have not had but one failure of the 74hct541 chips out of over 200
boards, but I will be using the 74ACT541 from now own, just makes good
sense.
Thanks for the heads up.
Jim

----- Original Message -----
From: "Mariss Freimanis" <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, March 12, 2004 5:13 PM
Subject: [CAD_CAM_EDM_DRO] Re: Servo only moving one way


> Jim,
>
> 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.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, <james_cullins@s...> wrote:
> > I just ordered 100, I didn't realize your optos used that much
> current.
> > Jim
> > ----- Original Message -----
> > From: <james_cullins@s...>
> > 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@y...>
> > > 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:
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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.
> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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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........
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> List Mom
> List Owner
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>
> Yahoo! Groups Links
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