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    Default G540 and unbranded steppers

    Long time lurker, first time poster.
    I've finally bought my first CNC mill after a few failed attempts at making a wooden one in the past.
    I went for a Chinese 6040 mill, and also ordered a G540. I managed to get the PRT-E1500W VFD working and replaced the power supply with a 48V one for the gecko.

    However my issue is with the motors that came with the machine, i cannot get them to turn reliably. them mostly just shake. Unfortunately as they have no stickers on them I am having difficulty identifying what they are.
    I believe the gecko is working correctly, as it moves some old steppers quite happily.

    kind regards
    Ben
    G540 and unbranded steppers-20170430_143707-1-jpgG540 and unbranded steppers-20170430_143631-1-jpg

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    Default Re: G540 and unbranded steppers

    Look through any documentation you received or can find online for the 6040 you bought and see if somewhere there is a notation of the stepper specifications. You most likely noted that the G540 requires current limiting resistors on the connectors that match the motors. Without insuring they are correct you may damage something. I have no idea what your original power supply voltage was, but it's likely that the power supply and and steppers that came with the 6040 are a lower voltage/amp setup. You can measure/determine the amperage and inductance of stepper motors without having the spec sheet. Do some research online and and you'll find more info and instructions on how to do so. Maybe someone with the same machine will chime in that has the same motors and knows the specifics.
    Good luck.



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    Default Re: G540 and unbranded steppers

    Thank you very much for your response, I will have a look to see if i can identify the inductance of the windings.
    The current information I can find on the sellers listing are: Stepping motor:57 two-phase 3A 150N.cm
    They where running on a 24v PowerSupply
    I was performing the testing of the motors with a 2k resistor to limit the current to minimise the chance of damage.

    Many thanks



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    Gold Member john-100's Avatar
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    Default Re: G540 and unbranded steppers

    with a multimeter
    check you have correctly the identified the motor windings

    was it originally a 3 or 4axis 6040 router ?

    what was the original stepper drivers ? - if you can find the data sheet you will be able to find out what the motor current was

    what was the spec for the original power supply ?

    Assuming al the motors take the same current ,
    I would divide power supply current by the number of axis and then multiply the result by 1.4

    this will be close to current setting needed for your G540

    for example
    if you had a 6A power supply and 3 axis ( set for the same motor current)
    then the 3 drivers will each take 2A from the power supply
    multiplying by 1.4 gives you a driver motor current of 2.8A !

    the motor current is larger because the power supply only has to replace the resistive and eddy current losses
    the extra current comes from the recovered energy circulating in the motor windings


    John



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    Default Re: G540 and unbranded steppers

    ok, so i have checked the continuity from the drives to the DB9 connector, now i feel like an idiot, somehow I connected the coil across A and B, and the other across A' and B'
    the machine was a 4 Axis device, this one on eBay 4 Axis CNC 6040 desktop Engraving Router Machine Precision Ball Screw 1.5KW int | eBay
    G540 and unbranded steppers-4-axis-cnc-router-6040-15kw-vfd

    unfortunately, the original drivers where unbranded, and i have yet to locate the datasheet for driving them.the main marking is TX14207, using a "toshiba" TB6560AHQ
    G540 and unbranded steppers-20170430_204106-1-jpg

    the power supply was a 24v 6 Amp device, though it had a smaller motor on the A and Z axis, and a larger ones on X and Y.

    thank you so much for your assistance, im going to go back and fix my mistake, and set the currents from your advice.

    Ben



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    Default Re: G540 and unbranded steppers

    Hi Ben

    That's good you have found why the motors don't turn as expected

    looking at the TB6560AHQ data sheet I can account for 6 of the 7 Red DIL switches on the driver board

    do all the 4 stepper drivers have the switches set the same way ?

    if all 4 drivers are set the same way then the current will be about 2A
    and you will need to fit 2K0 resistors to the Gecko G540 9 pin plugs

    depending on the manufacturer ,
    various stepper motor data sheets I have looked at indicated the motors can run at 70 or 80 degrees C - too hot to hold your hand on !

    john



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    Default Re: G540 and unbranded steppers

    Hi RaptorZ... I have the exact stepper drivers in my China 3040 CNC..... The driver board for my 'A' axis just died after a couple of weeks of using the machine. I'm trying to get the company I purchased from (eBay seller) to replace it under warranty but they (predictably) won't reply to me.

    Questions for all the experts out there... Do any of you know of a place where I can purchase a replacement driver board (TX14207)? If not, what's the chance it's the TB6560AHQ chip that's burnt? I can get those on Amazon and it's easy enough to replace it. The other alternative (of course) is to just go with a higher quality board but then I also have to rewire the controller which i'd prefer to avoid. I'd appreciate any advice anyone has..

    Thanks...



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    Default Re: G540 and unbranded steppers

    I have not seen a TX14207 for sale

    have you had a look at this cnczone post about the infamous TB6560 boards :-
    https://www.cnczone.com/forums/gener...-software.html

    if you replace the TB6560 IC check the two 0.22 ohm resistors used for the current sense

    John



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    Default Re: G540 and unbranded steppers

    HI John,

    Thanks for the guidance... I read the article on the TB6560... Point well taken. Unfortunately, I have 4 of these drivers in my Controller (x4 TX14207's)... One's already done... Based on what I read, my best bet is to find a good reliable driver board with a similar footprint and begin replacing them as they go out. Any suggestions on a reasonable budget?



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    Default Re: G540 and unbranded steppers

    As a follow up - I've done some research and seems some like the Leadshine AM882... I'm still researching because i want to avoid the TB6560HQ chips and most all of the boards I've researched have them... This is a pic of the i'm considering... That said, the boards I am using now (TX14207) have three connections... #1 - Motor outputs (x4 leads), #2 - Power Input 12v (Pos and Neg), #3 - Cable from the RnR controller card (3 Leads - Red, Blue and Black)... I'm not sure how this translates to the AM882 as it has the same connection points for the Motor outputs and motor power but it has many more inputs from the controller card.... Is this board compatible with my unit?




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    Default Re: G540 and unbranded steppers

    the photos of the TX14207 I have found on the web show a 3 pin connector for a common +5V , step & direction connections
    but you can see the PCB can be fitted with a 6 way terminal block
    G540 and unbranded steppers-tx14207-jpg

    the top left hand corner of this wiring diagram has the connections for the TX14207
    G540 and unbranded steppers-6040-tx14207-tb6560-stepper-driver-wiring-jpg

    John



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    Default Re: G540 and unbranded steppers

    John,

    You're a Saint! Thanks for all this detail... One question is: Why are the 'Z' axis A+/A- pins reversed? It's indeed how my controller/drivers are wired but was curious why...



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