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Thread: Motors making funny noise when idling

  1. #13
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    Default Re: Motors making funny noise when idling

    Quote Originally Posted by mercurysinking View Post

    Edit: Rereading this post, it seems like the only thing that this could be would be a grounding issue or something specific to the MX4660. Maybe something to test to isolate those two things would be to turn on the on-board charge pump on the driver and see if the noise occurs, then if it does, disconnect the parallel port from the computer and see if it continues happening. If it does, the MX4660 is to blame, if it stops, then it is likely a grounding issue.
    So two things. One, your post tells me that it likely is not my smoothstepper that is causing the issue.

    Two. I’m pretty dumb...how do you activate the on-board charge pump? Is there a switch on there to turn it on? Or does it need to be wired into Mach3 somehow..?



  2. #14
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    Default Re: Motors making funny noise when idling

    The charge pump controls when the motors are enabled - the MX4660 needs a signal to enable the stepper drivers, but it provides a dip switch to generate the signal internally vs from the parallel port. My drive has plastic partially covering it, so it was difficult to move the switch when I enabled it previously. See page 11 of the manual - http://www.leadshineusa.com/UploadFi...660hm_V1.1.pdf. You will want to turn the dip switch on to generate the signal internally, then the drives will still be enabled when the parallel port is removed from the equation.

    I don't think anything bad will happen if you remove the parallel port while the drives are enabled (might want someone else to chime in before you do it), the step / dir pins and any outputs you have will be disconnected (limit switches won't be respected, so if it did move you'd want to be close to the estop / be able to pull the plug). I haven't used a smoothstepper, but maybe disconnecting the ethernet from the computer would be better vs. removing parallel from the driver.


    From this post: Consistent stepper clunking. All axis' all the time, an older computer solved the issue. What kind of computer are you using? I'm using an Optiplex 380.



  3. #15
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    Default Re: Motors making funny noise when idling

    Kinda sounds like maybe the current reduction is kicking in and out.??
    Can you disable the auto current reduction?

    Gerry

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  4. #16
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    Default Re: Motors making funny noise when idling

    Doesn't look like automatic current reduction can be disabled on the MX4660.



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    Quote Originally Posted by mercurysinking View Post
    The charge pump controls when the motors are enabled - the MX4660 needs a signal to enable the stepper drivers, but it provides a dip switch to generate the signal internally vs from the parallel port. My drive has plastic partially covering it, so it was difficult to move the switch when I enabled it previously. See page 11 of the manual - http://www.leadshineusa.com/UploadFi...660hm_V1.1.pdf. You will want to turn the dip switch on to generate the signal internally, then the drives will still be enabled when the parallel port is removed from the equation.

    I don't think anything bad will happen if you remove the parallel port while the drives are enabled (might want someone else to chime in before you do it), the step / dir pins and any outputs you have will be disconnected (limit switches won't be respected, so if it did move you'd want to be close to the estop / be able to pull the plug). I haven't used a smoothstepper, but maybe disconnecting the ethernet from the computer would be better vs. removing parallel from the driver.


    From this post: Consistent stepper clunking. All axis' all the time, an older computer solved the issue. What kind of computer are you using? I'm using an Optiplex 380.
    So for simplicity’s sake, it sounds like I could just turn the power on for the driver, and then watch and see if the jittery stuff happens with/without the charge pump enabled. I don’t see a reason to have anything plugged into the computer...it should happen regardless, if the problem does reside on the MX4660 right?

    I’m running an Acer laptop with Windows 10. Smoothstepper makes this work perfectly fine, but I’m looking into using a mini PC instead. Less bulky, easier to mount somewhere inconspicuous.

    One thing I also noticed in the manual that you linked to is the “smoother” switch, which says it can reduce erratic and jittery movements. I wonder if this can calm the motors? There isn’t a whole lot of info in the manual about this switch. Other than the fact that it won’t do any harm to turn it on or off.

    Ger...I didn’t see anything in the manual about disabling the auto current reduction, but Ahren at CNCRP suggested something similar, that the auto current reduction was maybe the problem. He said probably don’t worry about it unless you start losing position. Maybe an email to Leadshine would be helpful at this point as well.



  6. #18
    Community Moderator ger21's Avatar
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    Default Re: Motors making funny noise when idling

    With the PC turned off, turn on the MX4660 and see if it still does it.

    Gerry

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  7. #19
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    Quote Originally Posted by ger21 View Post
    With the PC turned off, turn on the MX4660 and see if it still does it.
    I just gave that a try, only had a few minutes so I’ll give it longer this afternoon. But in the few minutes I was able to give this a test, I noticed no odd noises/clunking. Which tentatively leads me to think maybe it is Windows 10 and/or the smoothstepper that needs to be looked into. Not certain, but seems likely, since the problem stops when they are not part of the signal chain.

    EDIT: Also worth noting, I plugged into a different circuit. So a bad ground could potentially be the issue as well. I’ll test again on the usual circuit later today.



  8. #20
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    Default Re: Motors making funny noise when idling

    I really don't see how it could be the Smoothstepper.

    And just confirm that the motors are locked up when the PC is turned off. The drive needs to be enabled and holding the motors in position.

    Gerry

    UCCNC 2017 Screenset
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    JointCAM - CNC Dovetails & Box Joints
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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  9. #21
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    Quote Originally Posted by ger21 View Post
    I really don't see how it could be the Smoothstepper.

    And just confirm that the motors are locked up when the PC is turned off. The drive needs to be enabled and holding the motors in position.
    OK, so I have the machine plugged in again, back on the original circuit. The motors are locked up and holding position. Nothing is connected to a computer. So far, no weird noises. I need to run a few more errands this afternoon so I’ll hook the computer up later and see if that introduces the clunking.

    While I’m here, do I need to be concerned about the driver getting hot? After a while the enclosure I have the electronics in gets warm to the touch, which means the driver is getting pretty toasty. Is it rated for that kind of heat or should I be looking at a solution to this?



  10. #22
    Community Moderator ger21's Avatar
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    Default Re: Motors making funny noise when idling

    It should have a fan on it I would think. It's going to get just as hot, if not hotter, when it's actually running the machine.

    Gerry

    UCCNC 2017 Screenset
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    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  11. #23
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    Quote Originally Posted by ger21 View Post
    It should have a fan on it I would think. It's going to get just as hot, if not hotter, when it's actually running the machine.
    I should clarify...the box gets hot after being on and running the machine for an hour or so. But regardless, I’ll gut my previous electronics box and use the fan. More updates to come in a few hours.



  12. #24
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    Default Re: Motors making funny noise when idling

    Update time. Before, when I had the electronics plugged in on an extension cord into the house, the clunks seemed to happen pretty often. The first and simplest thing to try was to put the machine on a different circuit. We have a surge protector in the laundry room which tells us if the outlet is grounded or not. The ground light is green, so I figured I can at least see if maybe a bad ground was the issue. I'm inclined to think it was the issue.

    I have the machine plugged into the laundry room outlet (known to be a good ground) as I'm typing this. Mach3 is running and I can jog the machine around. I haven't heard one clunk since I've powered the machine on. Very interesting. Makes me a little nervous about the grounding in the rest of the house. What I don't know is if that will change after running a job. Before, it seemed like I'd only get the clunking after the machine had run some gcode and I had jogged the gantry back to its corner. I don't see how that would make a difference, but just an observation. I'm sure I just didn't notice the clunking before I ran the gcode.

    So, I'll jog the machine around a bit and leave it on for a good chunk of time and see what happens. Problem *potentially* solved!

    EDIT: Scratch that....the machine still makes the funny clunking noises, but they're much smaller/quieter now. I wonder if Windows 7 would resolve the problem. I mean it really isn't a huge problem since I'm not losing positioning, but it would be nice to eliminate any concern.



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Motors making funny noise when idling

Motors making funny noise when idling

Motors making funny noise when idling