Loading ...
Sorry, an error occurred while loading the content.

Re:noise problem. Not solved

Expand Messages
  • danmauch
    If you use no resistor the current will be 3.5A but there is no auto current reduction. Use a 3.47K resistor for 3.47A and retain auto current reduction. Dan
    Message 1 of 14 , Jul 25, 2013
    • 0 Attachment
      If you use no resistor the current will be 3.5A but there is no auto current reduction. Use a 3.47K resistor for 3.47A and retain auto current reduction.
      Dan

      --- In mach1mach2cnc@yahoogroups.com, Dave <dc9@...> wrote:
      >
      > If you set the current limit on the G540 to the max 3.5 amps (I think
      > that is no resistor - as I recall) it should be able to drive those nema
      > 34's at reduced power. Make sure you PS voltage is not too great for
      > the G540.
      > I've driven Nema 34s with a G540 before.. You may have to run at
      > reduced accel/speed but at least you can eliminate your existing BOB as
      > a concern or confirm that it is bad.
      >
      > Dave
      >
      > On 7/24/2013 7:30 AM, qconvers@... wrote:
      > >
      > > Hi Dave,
      > >
      > > Yes, I've put the RAM back to 512 Mb with no effect.
      > >
      > > I've ordered a new cable as I didn't have one. I don't have a spare
      > > BOB but
      > > I'm about to order one. I've got a Gecko 540 but I believe that won't
      > > handle Nema 34s at 4.2 amps...
      > >
      > > I've been going round in ever decreasing circles and I'm convinced
      > > it's one
      > > of the items you mention.
      > >
      > > I have X limits and X home on the same pin. I can enable the home, but
      > > enabling either limit will cause immediate, constant limit trip now,
      > > but with
      > > no LEDs on. Even with them disabled I've seen other LEDs flash and
      > > completely physically removing the switches does not solve the problem.
      > >
      > > I'm sure replacing LPT cable and BOB will solve it. I'll let you know
      > > when they turn up.
      > >
      > > Thanks for your concern, it's nice just to share the problem as I don't
      > > know anyone else here that has a clue what I'm facing.
      > >
      > > Regards Dave
      > >
      > >
      > >
      > >
      > > In a message dated 24/07/2013 04:55:52 GMT Daylight Time,
      > > dc9@... <mailto:dc9%40dc9.tzo.com>
      > > writes:
      > >
      > > Call me a nag... but have you undone ALL changes you made recently to
      > > your previously running system?
      > >
      > > Have you swapped out the BOB, LPT card, LPT cable, and computer?
      > >
      > > You need to make one change at a time, and then evaluate.
      > >
      > > If you start installing the E Smoothstepper you might just dig yourself
      > > another rabbit hole...
      > >
      > > Dave
      > >
      > > On 7/22/2013 3:18 PM, qconvers@... <mailto:qconvers%40aol.com> wrote:
      > > >
      > > > Nope, with the X axis limit switch detached from the BOB completely,
      > > Mach
      > > > keeps getting tripped by the E stop. At one point it was reset, trip,
      > > > reset,
      > > > trip, reset, trip...
      > > >
      > > > I've re routed the LPT cable so it's not near any high voltages.. no
      > > > good.
      > > > I've disconnected all the inputs to the BOB now and I'm kind of
      > > hoping it
      > > > will trip.
      > > >
      > > > So you wire one wire from the switches to the BOB inputs and the
      > > other to
      > > > the star ground with all the shields and the mains earth... have I got
      > > > that
      > > > right? I've had each switch across and input and GND on the board. I
      > > > thought all those wires stuffed into one small screw terminal might be
      > > > wrong.
      > > > So do I connect the GND to the star point too? It's funny that this
      > > thing
      > > > has worked so well for so long.
      > > >
      > > > I'm going to order an Opto Isolated BOB and a new LPT cable and walk
      > > away
      > > > from this tomorrow. Just to get some work done.
      > > >
      > > > I ran the driver test and it says my system is excellent...
      > > >
      > > > Slowly losing it, Dave
      > > >
      > > >
      > > >
      > > > In a message dated 22/07/2013 07:47:23 GMT Daylight Time,
      > > > jiminwoodstock@... <mailto:jiminwoodstock%40gmail.com>
      > > <mailto:jiminwoodstock%40gmail.com> writes:
      > > >
      > > > Additional info...
      > > > My limit switches are wired from ground to the interface board inputs.
      > > > The
      > > > interface board is configured so that +5v is present until the switch is
      > > > closed which will bring the input to 0V. This way any possible noise
      > > > on the
      > > > wire is shunted to ground by the normally closed switch.
      > > >
      > > > [Non-text portions of this message have been removed]
      > > >
      > > >
      > >
      > > [Non-text portions of this message have been removed]
      > >
      > > ------------------------------------
      > >
      > > www.machsupport.com - Web site AccessYahoo! Groups Links
      > >
      > > [Non-text portions of this message have been removed]
      > >
      > >
      >
      >
      >
      > [Non-text portions of this message have been removed]
      >
    Your message has been successfully submitted and would be delivered to recipients shortly.