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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > CL86T Driver Issues - Closed Loop Stepper Driver
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  1. #1

    Join Date
    Oct 2020
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    1

    CL86T Driver Issues - Closed Loop Stepper Driver

    Hello All,

    I built my own machine CNC router which has been running perfectly for 2 months until my Z axis started playing up.

    im running Masso as the controller and Nema 34 Closed steppers.

    the Issue is with either the motor or the stepper driver (the error is that its losing steps).

    This occurs spasmodically sometimes on homing or halfway though the job.

    I have checked and the cabling joins are all fine.

    has anyone had this issue or if you have any troubleshooting ideas I will be glad to hear them.

    https://www.omc-stepperonline.com/download/CL86T.pdf

    its is the 3rd error in section 2.4

    https://www.omc-stepperonline.com/cl...l?search=cl86t

    https://www.omc-stepperonline.com/cl...5BNema%2034%5D

  2. #2
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    Jan 2014
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by Dreco View Post
    Hello All,

    I built my own machine CNC router which has been running perfectly for 2 months until my Z axis started playing up.

    im running Masso as the controller and Nema 34 Closed steppers.

    the Issue is with either the motor or the stepper driver (the error is that its losing steps).

    This occurs spasmodically sometimes on homing or halfway though the job.

    I have checked and the cabling joins are all fine.

    has anyone had this issue or if you have any troubleshooting ideas I will be glad to hear them.

    https://www.omc-stepperonline.com/download/CL86T.pdf

    its is the 3rd error in section 2.4

    https://www.omc-stepperonline.com/cl...l?search=cl86t

    https://www.omc-stepperonline.com/cl...5BNema%2034%5D

    I have the same exact motor and driver. I am having an issue where the motor/drive will not respond to the direction signal spasmodically. Suddenly if the axis is supposed to travel in the - direction it will travel in the + direction. If I move the driver to another axis, the problem follows the driver so it does not apear to be the signal coming from my controller Centroid Acorn. This has happened on 2 drives so far, so I have lost confidence in these things. I am in the stage of finishing my machine and doing some calibration and test cuts, so these drives do not have any real use.

    Did you ever resolve your issue? Anyone else having problems with stepper online closed loop stepper setups?

    At this point, I feel like I need to consider some alternative, since 2 problems out of 4 drivers is not really giving me much confidence.

    Kirst

  3. #3
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    Dec 2012
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    188

    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    What kind of breakout board do you use, are you sure the input to the direction is good enough.

  4. #4
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by Toinvd View Post
    What kind of breakout board do you use, are you sure the input to the direction is good enough.
    I am using a centroid acorn with 24v for the signals. If I swap the faulty drive to a different axis, the issue follows the drive to the new axis which leads me to believe that the problem is with the drive and not the input signal.

  5. #5

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    Oct 2021
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    2
    Quote Originally Posted by Kfed View Post
    I am using a centroid acorn with 24v for the signals. If I swap the faulty drive to a different axis, the issue follows the drive to the new axis which leads me to believe that the problem is with the drive and not the input signal.
    I am currently having this exact same problem, with the exact same components. I have a replacement driver on the way, and I will update when I have more information.

    Have you made any headway since your last post?

  6. #6
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    This might be due to the input of the driver which consist of a opto coupler.
    The resistor internal is perhaps calculated for 5 volts which means that working on 24 volts input signal, the LED in the opto coupler get's a bit to much leading it to fail after some ( long ) time.
    When you replace the driver you could add a resistor in series to the signal for step, dir and enable. go for something like 3K3

  7. #7
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by Toinvd View Post
    This might be due to the input of the driver which consist of a opto coupler.
    The resistor internal is perhaps calculated for 5 volts which means that working on 24 volts input signal, the LED in the opto coupler get's a bit to much leading it to fail after some ( long ) time.
    When you replace the driver you could add a resistor in series to the signal for step, dir and enable. go for something like 3K3
    The manual tells you to do that anyway using a 2k (if it's actually read).
    https://www.omc-stepperonline.com/download/CL86T.pdf

    How is it wired up?.
    It does say specifically on the acorn.......
    Use the screw header outputs for 24v SERVOS....
    Use the DB25 TTL 5v outputs for STEPPER DRIVES.
    https://www.centroidcnc.com/centroid...controller.pdf

    If you used the 24v headers for the steppers then maybe you need to read the manuals and ultimately this is where your problem lies.
    If a drive is reated for 5v, then use 5v. If a drive is rated for 24v, then use 24v.

  8. #8
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by dazp1976 View Post
    The manual tells you to do that anyway using a 2k (if it's actually read).
    https://www.omc-stepperonline.com/download/CL86T.pdf

    How is it wired up?.
    It does say specifically on the acorn.......
    Use the screw header outputs for 24v SERVOS....
    Use the DB25 TTL 5v outputs for STEPPER DRIVES.
    https://www.centroidcnc.com/centroid...controller.pdf

    If you used the 24v headers for the steppers then maybe you need to read the manuals and ultimately this is where your problem lies.
    If a drive is reated for 5v, then use 5v. If a drive is rated for 24v, then use 24v.
    I was following the Acorn schematics for the CL86Y which is of course a different drive than the CL86T. After reading the CL86T manual more carefully I have rewired the drive to use the 5V from the acorn power supply. So far it seems to be working fine. Stepperonline was really good about sending out a replacement for the failed drive.
    [https://www.centroidcnc.com/dealersupport/schematics/uploads/S15033.r2.pdf[/URL]

  9. #9

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    Oct 2021
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by Kfed View Post
    I was following the Acorn schematics for the CL86Y which is of course a different drive than the CL86T. After reading the CL86T manual more carefully I have rewired the drive to use the 5V from the acorn power supply. So far it seems to be working fine. Stepperonline was really good about sending out a replacement for the failed drive.
    [https://www.centroidcnc.com/dealersupport/schematics/uploads/S15033.r2.pdf[/URL]
    Once again, I did exactly what you did and followed the Acorn schematics for the CL86Y. After reading this morning's replies, I decided to troubleshoot a bit before the new drive shows up. I wired the CL86T for 5v and gave it a shot. Unfortunately, this amplified the problem, and erratic behavior started to show up on the axis that was previously working without problems, and the axis that was previously having problems continued to have the same issues.

    I still have the replacement drive on the way, along with some 2K resistors to wire as the CL86T manual shows for the 24v configuration. I also ordered a DB25 breakout board to give that a shot in the case that I continue to have problems after swapping the drives.

    Kfed,
    1.Are you using the screw headers or the DB25 connection? I am currently using the screw headers, even when changing the voltage to 5v (maybe this is a problem).
    2.Would you mind posting some pictures of your wiring, or do you have a configuration/wiring diagram that varies from the Acorn CL86Y Schematic?
    3.Do you have the "Pend+/Pend-" connected to anything? They are unused on the Acorn schematic.

  10. #10
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    Re: CL86T Driver Issues - Closed Loop Stepper Driver

    Quote Originally Posted by Cahark View Post
    Once again, I did exactly what you did and followed the Acorn schematics for the CL86Y. After reading this morning's replies, I decided to troubleshoot a bit before the new drive shows up. I wired the CL86T for 5v and gave it a shot. Unfortunately, this amplified the problem, and erratic behavior started to show up on the axis that was previously working without problems, and the axis that was previously having problems continued to have the same issues.

    I still have the replacement drive on the way, along with some 2K resistors to wire as the CL86T manual shows for the 24v configuration. I also ordered a DB25 breakout board to give that a shot in the case that I continue to have problems after swapping the drives.

    Kfed,
    1.Are you using the screw headers or the DB25 connection? I am currently using the screw headers, even when changing the voltage to 5v (maybe this is a problem).
    2.Would you mind posting some pictures of your wiring, or do you have a configuration/wiring diagram that varies from the Acorn CL86Y Schematic?
    3.Do you have the "Pend+/Pend-" connected to anything? They are unused on the Acorn schematic.
    Cahark:
    1. I am using the screw headers. It might be better to use the DB25 connector. It was easy to switch the 5V + to the Acorn, but looking more closely, I may need to switch to DB25 connection. Unfortunately the connector will not fit inside my cabinet without a big remodel.
    2. Here is a modified Schematic how I hooked it up using the Acorn supplied power supply.
    3. I do not have anything wired to the Pend+/Pend-.

    The problem I had was that the motor would respond to step signals, it would always move, but not always in the correct direction. As Toinvd pointed out, the optocoupler on the direction input signal may be damaged such that the drive is not behaving. The damage may have already been done on your axis that was previously working.

    What is the behavior the you are experiencing with your motor - drives?

    If I had it to do over, I probably would have opted for the CL86Y.

    My system seems to be working now, I have not used it much yet. I did have some mis-alignment with a 2 sided part yesterday. I figured it was bad registration on my part. I am wondering now if there could be some missed steps due to the 5V to the screw terminals on the Acorn?

    Good luck, and keep me posted on your progressAttachment 471260

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