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Thread: Toshiba TB6600

  1. #37
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    The motor current should always be set by measuring the VREF voltage while adjusting the pot, there should be testpoints and a formula on how to calculate Vref vs motor current. Guessing shouldn't be needed.

    A low esr cap will perform better at these high switching frequencies and will also last longer. It's the same problem on switching power supplies, PC mainboards etc.. Do a search on bulged or leaking electrolytics, some brands are famous: when they fail replace the cap's by quality ones and everything is fine again.

    Looks like both use the same oscillator frequency, just to be sure: can you check the resistor value connected to pin 23 of the chip? It will probably be 51K.

    The THB6064 has the option of 4 decay modes, these settings don't influence directly the midband resonance but make it worse for some motors. Fast decay is best at faster speeds but some motors don't like it and vibrate more on the resonance speeds. With the THB6064 you have the option to select what's best for your motors and setup.

    "$40 per inch"... a good one , there goes the profit of buying cheap...

    A good stepper drive needs a good PCB design (as H500 said) and selection of quality components. This is what I did on the THB6064 design, no compromises: only the best and the result is there: not a single failure, smoke, bang whatever... only happy customers and silent motors.

    Do you have a link to the Rattm? Can't find it.



  2. #38
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    H500 and Lucas, Thanks for the info! H500, yes, the Rattm seems to have a string of problems. My only concern on the Haoyu is the temperature; I wonder if the idle current reduction wasn't working on mine, since it overheated at idle. Is idle current reduction automatic in the TB6600, or configured by the board? I couldn't find anything in the preliminary TB6600HQ datasheet, or the newer summary for the TB6600HG. I look forward to them being ~$2.

    Lucas, yes, the Rattm has test points, and I found the Vref formula in the HQ datasheet, but I didn't know what Rnf was or if that older formula was still accurate. On mine at idle, I recall that Vref ranged from 0.5 to 2.8V while turning the amp pot from min to max. Thanks for the google tip on bulging caps. I traced pin 23 on each to its resistor, and both were indeed about 51k.

    Here's the link to the Rattm I bought (they're on holiday like the rest of China now): New Product 4.5A TB6600 stepper motor driver board-in Motor Driver from Industry & Business on Aliexpress.com

    The TB6064 kits look interesting but I want a presoldered board, and the higher amps of the 6600 helps a bit. I'll be needing a bunch of drives, which is why I'm reviewing the options more carefully. And there's one more: High Efficiency CNC Router Mill Lathe 1AXIS TB6600HG Stepping Motor Driver Board | eBay

    David Malicky


  3. #39
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    The TB6600 doesn't have automatic idle reduction, it's done by additional circuitry on the board wich also includes the run led. I think they use pin3 (torque input) for this.
    It only works if the correct step polarity is selected, the run led should be off when idle. Do you remember if it was?

    The current calculation is the same as for the THB, RNF = 3 x .680 ohm in parrallel = .227 ohm for the Haoyu.

    Higher amps for the TB6600 is only 0.5A and it seems that the power stage of both chips is the same only the control section is different. I had the THB running at 5A without problems.



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    If idle current reduction was working, you would know, because the torque goes down to 30%. As Lucas mentioned, the chip itself does not have the timing circuit built in. It is done with extra circuit. I consider it to be an indispensable feature. On my mill, the motors barely get warm because the the typical duty cycle is quite low.

    I doubt that the 6600 can actually handle more current than the 6064. Heat is the issue. The 6600 has a 5v regulator built in. This will create more heat, especially if the designer didn't pay enough attention to how much 5v current is used by the external circuits.



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    Thanks, that makes sense. The Rattm's run led stayed on at idle, so no idle reduction. I recall the Rattm Vref was ~2.1V with the current pot set to a guess of 3.5A. 2.1 / (3*.227) = 3.1A, so that explains at least part of why it ran cooler.

    David Malicky


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    To enable idle reduction from Mach, try this. Go to Config---Ports and Pins---Motor Outputs. Change DirLowActive to the opposite of what it is currently set to.



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    Would one of the electronics experts on this thread compare the two stepper drivers below and tell me which is better and why. I am in the process of upgrading my CNC controller to discrete components.

    Thanks

    THB6064AH MassMind.org

    CNC THB6064AH Two 2 Axis 64 Micro-step 4A Stepper Motor Driver MACH3 No Heat #A559A on eBay.



  8. #44
    Registered James Newton's Avatar
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    I'm biased because I sell the massmind kit. But...

    The ebay item is better because it's less expensive, already assembled, comes with the heat sink and opto-isolation.

    The ebay item is worse because it's totally undocumented, will have NO support after the 7 day feedback limit (and won't arrive until after that limit has passed), is poorly made and is difficult to repair.

    The Massmind item is better because it's better engineered, comes with higher quality components, is well supported and easy to repair (since you build it from a kit).

    The MassMind item is worse because you have to build it, it's a bit more expensive, doesn't have opto-isolation, and you have to supply the heat sink.

    But you know why you should buy the kit from me, really? Because here I am. I saw and posted an honest answer on your thread within a day. Ask china a question and see what you get. I can show you videos of machine running from my driver, built by people just like you. Ask them if you should buy one or not; ask them if I took care of them. Ask any of the thousands of people who bought a cheap TB6560 driver from china and then come here whining for help when the seller wouldn't return their emails and the board fried and they don't know how to repair it.

    Did I mention I was biased? ,o)

    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)


  9. #45
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    Well I'm biased too :-)

    But there are 2 things that stand out just by looking at the chinese drive:
    - First the "no heat" is not true, there's no way you can seriously reduce the power dissipation of the chip, It will be 3.2W minimum @ 4A for each chip and thus 6.4W minimal for the 2.
    What they refer to is the on board 5V regulator wich is a switched one iso of a linear, this is how they mention it in poor english: "The drive uses two antihypertensive treatment, with the same DC module buck, almost no heat". There is some heat from a linear regulator like the one I use but this is peanuts compared to the heat from the chips.
    (Sidenote from Google: Antihypertensives are a class of drugs that are used to treat hypertension (high blood pressure).)

    - Look at the very small (and poor quality 85C) filter capacitors and compare these with the ones on our boards, ours are high quality Panasonic 105C low esr ones. Good capacitors are expensive and it's the easiest part to reduce the price and thus reduce the lifetime of the drive by a factor 3 or 4. This can be proved by comparing datasheets with ESR and allowed ripple current.

    There's probably more that I can't see. Testpoints to adjust the motor current correctly is one.

    Bottom line: Choice is yours: quality with 'lifetime' support or cheap and...

    James and I have sold hundreds of drive kits with only a few minor issues wich have been solved promptly.



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    I just read the TB6600 data sheet and notice that max current to sink at Alert and MO pins is 1ma. Then I looked at the Haoyu circuit that lucas posted and they are lighting a LED with 8ma. I assume to save a transistor.



  11. #47
    Registered James Newton's Avatar
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    Ha! So you get ONE error, and then the LED fries the error output and you never /see/ another error, your motors just don't spin. Funny. Luc and I use a larger resistor so the LED will be dimmer, but the output won't blow and provide an option for a transistor if you want a brighter display.

    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)


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    I have looked at the TB6600 datasheet to determine the max current that can be sourced by Vreg. without success. Has anyone found this out? The Haoyu schematic if done right should draw 15ma or so and seems not to be unreasonable. By done right I mean transistor for the Alert led.



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