584,846 active members*
4,447 visitors online*
Register for free
Login

Search:

Type: Posts; User: Mariss Freimanis

Page 1 of 17 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    147
    Views
    28,935

    Re: 6amp 60v 10 microstep bipolar drive

    I think what got misinterpreted was where R4-R7 go. The IR2104s have a 'peculiarity' that is addressed in a deeply buried application note. That ap-note says VS (pin 6) must be at ground potential...
  2. Replies
    147
    Views
    28,935

    Re: 6amp 60v 10 microstep bipolar drive

    The way you have the 100K resistors connected is what's blowing up your bridge. R5 should go to the half-bridge output terminal, it must not go to the Q1 MOSFET gate! Get rid of R4, it is doing...
  3. Replies
    12
    Views
    3,778

    Re: G540 pins 2,3,4

    John,

    1) I designed the board layout in that region to 250VAC rules for dielectric breakdown and creepage voltages because the modular connector block is CE certified to 250VAC.

    2) The...
  4. Replies
    12
    Views
    3,778

    Re: G540 pins 2,3,4

    "I took it as "Not Connected", but wanted to be absolutely sure"

    I'm glad you checked and verified. I run into this all the time when it comes to IC pin designations. I err on the side of caution...
  5. Replies
    12
    Views
    3,778

    Re: G540 pins 2,3,4

    "Thank you for your timely response"

    Sorry about that. I and our engineering department had to go 'total tunnel vision' on a major design effort during October, December and half of this month...
  6. Re: Steppers buzzing with Gecko G540 while idle and high pitch when stop

    1) Are your current set resistors located on the DB-9 at the G540 end? You will get various obnoxious noises if the resistor is at the motor end of the cable. The motor wires in the cable inject all...
  7. Re: No feedback from encoder on a 320x

    Please see the HEDS modification application note on the G320X product page.
  8. Replies
    12
    Views
    3,778

    Re: G540 pins 2,3,4

    The DB-9 pins 2, 3 and 4 go to ground. Don't use them for what you planned to do.
  9. Replies
    5
    Views
    2,241

    Re: G540 was working now it is not

    Your Y axis is shot. Please return the G540 for evaluation and repair.
  10. Replies
    13
    Views
    2,113

    Re: connecting shielding

    Use pins 2, 3 or 4 on the DB-9 connector for grounding a shield. The shield should be unterminated at the motor end. Be careful connecting the shield wire to the DB-9 connector, don't let it touch...
  11. Replies
    6
    Views
    2,401

    Re: Gecko 540 Random Fault

    Temporarily replace your E-stop switch with a wire jumper at the G540 and see if cures the problem. If it does then you have a bad switch and/wiring to the switch. Also jiggle the motor wires at the...
  12. Re: Burned Gecko G540- Power Supply or DB9 cables?

    28 gage wire is rated at 0.226 Amps and you were pushing 3.5 Amps through it. That's 15 times the wire gage current limit and it generated 240 times more heat than the wire is rated for. No wonder...
  13. Replies
    414
    Views
    61,800

    Poll: Re: Global Warming Poll

    This 'Judith' person was just a drive-by global warming Alarmist. She (?) will never read the reply and was just doing it as a homework assignment from some instructor in some basket-weaving class...
  14. Replies
    414
    Views
    61,800

    Poll: Re: Global Warming Poll

    Judith, you are such a fool. Temperatures have fallen for the last 18 years and no one in high school now remembers when temperatures were warmer. Don't believe me? Look at this; genuine US data from...
  15. Re: Gecko G540 RMS Ratings (Everyone Who Owns One Or Is Getting One Should Read This)

    The reason is a little different than that. Motor currents are 3.5A and there actually is 14 Amps total circulating through all 4 motors without any time limitations at all. The G540 motor drives are...
  16. Replies
    9,196
    Views
    334,291

    Wow! "Typhoons, floods, and earthquakes...

    Wow! "Typhoons, floods, and earthquakes everywhere." Those things have never happened before in human history! You forgot to mention snowstorms, sub-zero temperatures and that global warming ended 17...
  17. Replies
    13
    Views
    4,167

    200nF and 1K gives a 200uS time constant. That...

    200nF and 1K gives a 200uS time constant. That should get you 48db attenuation for the 40kHz noise which should be plenty. The 10uF cap really doesn't do anything (no harm, no good) because your TC...
  18. The 4046 is a quasi-analog IC and not discrete...

    The 4046 is a quasi-analog IC and not discrete logic in the conventional (nothing but gates) sense. I'm very familiar with it and implement its Type II phase comparator in Verilog. We probably agree...
  19. Well, in theory you can build any imaginable...

    Well, in theory you can build any imaginable logic using just 2-input NAND gates. The idea behind the diversity of discrete logic medium-scale functions that existed up to the 90's was to replace...
  20. OK, for instance try to find a CMOS 74150 or...

    OK, for instance try to find a CMOS 74150 or 74147. Both are available only in the obsolete 7400 TTL family (slow, large package, awful noise immunity and power hungry). The first is a 16:1...
  21. acannell, I should have been more clear. There...

    acannell,

    I should have been more clear. There are very few discrete 74-series and 4000-series logic varieties available today in modern CMOS implementations (74HC, 74AC, etc.). I enjoyed...
  22. Think of a CPLD (or FPGA) as a collection of...

    Think of a CPLD (or FPGA) as a collection of gates and D-Flops that you can interconnect in any way you want to while MCUs are sequential machines that execute a list of instructions. A problem with...
  23. Replies
    13
    Views
    4,167

    An RC filter's effectiveness isn't dependent on...

    An RC filter's effectiveness isn't dependent on voltage. Make the time constant about 10mS to 100mS; the frequency that is interfering is 40kHz so the filter will have terrific attenuation for that...
  24. greybeard, It seems what you want is to...

    greybeard,

    It seems what you want is to produce a frequency proportional to a binary value; that's not real hard to do with 74HC logic and it's much easier to do with a $1 CPLD or PIC. If 74HC is...
  25. greybeard, It seems what you want is to...

    greybeard,

    It seems what you want is to produce a frequency proportional to a binary value; that's not real hard to do with 74HC logic and it's much easier to do with a $1 CPLD or PIC. Before I go...
  26. greybeard, It seems what you want is to...

    greybeard,

    It seems what you want is to produce a frequency proportional to a binary value; that's not real hard to do with 74HC logic and it's much easier to do with a $1 CPLD. Before I go into a...
  27. My 2 cents. The loop is closed either way, be it...

    My 2 cents. The loop is closed either way, be it in the drive or distributed between a controller and an amplifier. The disadvantages of a distributed controller and amplifier are:


    1) If the PID...
  28. Replies
    9,196
    Views
    334,291

    Yeah, it's called ocean acerbification. Big...

    Yeah, it's called ocean acerbification. Big problem I hear with it and coral reefs and sea slugs. Both are getting real mouthy and sarcastic because of our indifference to the imminent calamity of...
  29. Replies
    9,196
    Views
    334,291

    Thanks jhowelb, I just read about a major new...

    Thanks jhowelb,

    I just read about a major new science discovery that I think you may be interested in. It has been long speculated there exists an "island of stability" for elements with atomic...
  30. For your information, the G540 has been out for...

    For your information, the G540 has been out for years and is overdue for a major addition to its family tree and that will be the GM540. GM is our ultra-secret marketing code for "GeckoMotion"; any...
Results 1 to 30 of 500
Page 1 of 17 1 2 3 4