Newbie some help with g540


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    Default some help with g540

    Hi guys. i am Pavlos from Greece and this is my first attempt on build an openbuild woodworking cnc.

    I did bought a g540 last summer and some 23nema steppers. on my 3d printer i have my z steppers wired in series thing i had the intention on doing on the g540 until i saw that this is a no go ( or at least that's what i got) for g540, to wire to motors on the same drive.

    But after that reading on the sticky here i read that it is ok to wire them in parallel or even better to wire them in series . So what is this i can't understand. Can i or it is a no go?

    Now from my experience in 3d printing with the duets i am running, i can give the motors a variety of voltage or/and amperage. I was thinking that this was the case on the g540. Am i wrong ? I am thinking that the steppers i bought are probably too big so i was wondering if they would work with my 24v 400watt psu . Do i have to change my psu or my steppers or ( worst case scenario) the g540 ? is it possible to run them slower and/or at lower torgue to suit my psu ?

    this is the one stepper


    • Motor Type: Unipolar/Bipolar
    • Step Angle: 1.8 deg
    • Holding Torque(Bipolar): 2.83Nm(400oz.in)
    • Holding Torque(Unipolar): 2.0Nm(283oz.in)
    • Rated Current(Bipolar Serial): 2.83A
    • Rated Current(Bipolar Parallel): 5.66A
    • Rated Current(Unipolar): 4.0A
    • Phase Resistance(Bipolar Serial): 1.6ohms
    • Phase Resistance(Bipolar Parallel): 0.4ohms
    • Phase Resistance(Unipolar): 0.8ohms
    • Inductance(Bipolar Serial): 7.2mH ± 20%(1KHz)
    • Inductance(Bipolar Parallel): 1.8mH ± 20%(1KHz)
    • Inductance(Unipolar): 1.8mH ± 20%(1KHz)

    and this the one i would like to wire in series for my Y axis


    • Manufacturer Part Number: 23HS30-2804S
    • Motor Type: Bipolar Stepper
    • Step Angle: 1.8 deg
    • Holding Torque: 1.9Nm(269oz.in)
    • Rated Current/phase: 2.8A
    • Voltage: 3.2V
    • Phase Resistance: 1.13ohms
    • Inductance: 5.4mH ± 20%(1KHz)
    • reading all the above can you recommend me what resistance should i use on the 5-9 pin on my gecko ? or i can skip it .

    thanks in advance guys.
    Pavlos

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    Default Re: some help with g540

    Yes you can wire them in parallel, some high end CNC machines are wired in parallel but not the stepper motor wires, the stepper motor driver inputs are connected in parallel, ex. G540 > two stepper motor driver inputs connected in parallel > stepper motor wires connected on each stepper motor driver output.



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    Default Re: some help with g540

    thanks for the reply mate . for now i am having a hard time to get a the green led lit from my gecko.

    so for getting this more clear. it is ok to hook my two Yaxis steppers in series.

    anything about safe size on the resistor i had to install ?



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    Default Re: some help with g540

    Quote Originally Posted by Happy Feet View Post
    thanks for the reply mate . for now i am having a hard time to get a the green led lit from my gecko.

    so for getting this more clear. it is ok to hook my two Yaxis steppers in series.

    anything about safe size on the resistor i had to install ?
    If you connect the two stepper motors in series with only one stepper driver unit while you still use the same DC voltage you will loose a bit of torque, it`s much better if you control the stepper motors with independent stepper driver, then connect together the two input of the stepper driver to be controlled by the G540, the G540 can control as much as 10 units of stepper driver in one axis, that`s a total of 30 stepper motors on XYZ axis hehe, you can still connect another 30 stepper driver units if you want, to cut the story short the input of the stepper drive only needs clock signal from the G540



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    Default Re: some help with g540

    thanks mate.



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    Default Re: some help with g540

    Wiring steppers in parallel or series has to do with the windings in each motor; it's not about wiring multiple motors together. Here's some information on how it works: https://www.circuitspecialists.com/b...s-or-parallel/ https://openbuilds.com/threads/serie...ifference.802/ Usually people running CNC routers hook up their steppers bipolar parallel, which minimizes inductance and allows better speeds.

    Sometimes, especially for large machines, you will want to use two steppers to drive the long axis, so the gantry won't lose squareness and get stuck by pivoting on a single screw. This requires that one be "slaved" to another, but you'd still use a separate driver for each. The G-540 has 4 drivers in it, so this isn't a problem for a 3-axis machine.

    Your 24v power supply doesn't have enough voltage to run that first motor at optimum speed, even if it's wired bipolar parallel. The inductance means it wants about 43 volts. A 36volt supply would be better. That second motor is a 4-wire bipolar, so you don't have the option of wiring it differently, as with a 6 or 8-wire motor. Its 5.4mH inductance means that it would take about 74v to run at top speed. Since the G-540 won't handle more than 50v, it's not a good choice for this application. Get some more motors like the first one, along with a bigger power supply, and the machine should run fine.

    [FONT=Verdana]Andrew Werby[/FONT]
    [URL="http://www.computersculpture.com/"]Website[/URL]


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    Default Re: some help with g540

    edit : i think i posted it but i found it on the autosave.

    Quote Originally Posted by awerby View Post
    Wiring steppers in parallel or series has to do with the windings in each motor; it's not about wiring multiple motors together. Here's some information on how it works: https://www.circuitspecialists.com/b...s-or-parallel/ https://openbuilds.com/threads/serie...ifference.802/ Usually people running CNC routers hook up their steppers bipolar parallel, which minimizes inductance and allows better speeds.
    i use series connection on two small bipolar steppers on my mendel printers for z axis. on the printer i may be the slower guy ever exist and will be. i am a person who doesn't stress any tool (from a single hammer to a angle grinder) more than 50% of it's power Thats my key to safety. my printers are way slow. slower than anyone can imagine. this is the way i am getting successfull prints with my bad diy machines and filament. i dont mind going slow in life, not at all .
    BUT If it is a problem of damaging the machine or ( g540 or the steppers themselves or anything) i will plan to replace them with smaller ones or the ones you told me . I will also replace the power supply. but both of them will have to wait for couple of weeks to get the funds. I know i bought some big motors ( the plant was different at the beggining) but i didn't knew how big until you wrote. and thanks for that

    Quote Originally Posted by awerby View Post
    Sometimes, especially for large machines, you will want to use two steppers to drive the long axis, so the gantry won't lose squareness and get stuck by pivoting on a single screw. This requires that one be "slaved" to another, but you'd still use a separate driver for each. The G-540 has 4 drivers in it, so this isn't a problem for a 3-axis machine.
    i thought it should be a way to keep the a axis free so i would have the option later to go for 4axis. at this moment this is what i did. but i was hoping in a way.

    Quote Originally Posted by awerby View Post
    Your 24v power supply doesn't have enough voltage to run that first motor at optimum speed, even if it's wired bipolar parallel. The inductance means it wants about 43 volts. A 36volt supply would be better. That second motor is a 4-wire bipolar, so you don't have the option of wiring it differently, as with a 6 or 8-wire motor. Its 5.4mH inductance means that it would take about 74v to run at top speed. Since the G-540 won't handle more than 50v, it's not a good choice for this application. Get some more motors like the first one, along with a bigger power supply, and the machine should run fine.
    funny thing i remember i also bought a 36v ps last year but instead of that i got another 24. i ll check on the company to see what happened. it is very possible that i went for 24 for my duet boards. i will buy one as i told earlier but i will try and go more than 36v. the idea that i have to plug a second one for less voltage sounds costly but i think there is no other way.

    Leaving the machine as it is now would cause any problems ? i mean as the budget is closed for now, and i will get some steppers and a ps but not now. i have to wait a few days/weeks .

    some more things came up.

    i installed some resistors as the g540 says you have to do but all of them were smaller from what they should. on the first motor i got a reading of 2.67 kohm. is this bad. this motor makes a small "hishing" sound when it is standing. is this normal. i know that steppers sounds weird some times but i thought the g540 set the steppers on some kind of sleep/stanby motor.

    finally i want to have more than one e-stop. is there a way to do it with g540. is this a simple thing to do or it does need electronics knowledge ?

    thanks guys a lot for ur help and ur kind replies.



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    Default Re: some help with g540

    Leaving the machine as it is won't hurt anything if you don't run it. But I'm not sure what will happen if you insist on trying to run two motors off a single driver. I don't think it's necessary, and could well cause problems. It's normal for steppers to make a little noise even if they're not running. You only need to put resistors in to limit the current the motors will draw. Use the size that Gecko recommends for the current you're aiming at.

    [FONT=Verdana]Andrew Werby[/FONT]
    [URL="http://www.computersculpture.com/"]Website[/URL]


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    Default Re: some help with g540

    Guys i need some more help as i am hitting both of my heads on a brick...!

    i am trying to run my chinese 1.5kw water cooled spindle through mach but i am sure i am doing something wrong so there is no movement on the spindle . keep in mind that i had the spindle and the vfd tested before i plug them on the build and they were working fine. but at this moment i cant not start the spindle through mach.

    My setup is a relay taking a signal from pin 5 ( gecko g540 ) and shorting the FOR to the DCM ( on the vfd ). i have the Vi the ACM and 10V connected. i ve also messed up with the pd settings on the spindle but no spinning . i can see the relay is getting on but that all


    What should i look for. I am pretty messed up with ports and pins on the mach3 and the pd setting on the vfd and at this moment i donty know what to do so any help would be more than the welcome.



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some help with g540

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