problem with VFD, ErrorPin, JMC Motor ALM-Output

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Thread: problem with VFD, ErrorPin, JMC Motor ALM-Output

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    Default problem with VFD, ErrorPin, JMC Motor ALM-Output

    Hi there.
    The ErrorPin is enabled in the input / output settings.
    I did this so that all motors stop when one goes into alarm mode. The error pin is therefore connected to the alarm output of the JMC motor.
    Now there is a problem with the VFD frequency converter. As soon as the spindle motor is started, the control goes into the E-Stop. What have I done wrong.
    Everything is shielded correctly.
    I connected the JMC motors via common cathode.

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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Quote Originally Posted by tantemay View Post
    Hi there.
    The ErrorPin is enabled in the input / output settings.
    I did this so that all motors stop when one goes into alarm mode. The error pin is therefore connected to the alarm output of the JMC motor.
    Now there is a problem with the VFD frequency converter. As soon as the spindle motor is started, the control goes into the E-Stop. What have I done wrong.
    Everything is shielded correctly.
    I connected the JMC motors via common cathode.
    What is the VFD Drive name model #

    Mactec54


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    If you disable ErrorPin everything works correctly and there is no more unwanted E-Stop?



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Yes. Error Pin disabled => No Problems. But I need the input so that the machine stops when an engine goes into alarm mode.

    I have now found a solution. I have provided the ErrorPin input with an opto. I had done that for the other inputs, such as limit switches. I hadn't thought of the ErrorPin anymore.

    Now it's working. I hope.
    Before that, however, I will try a few milling.

    - - - Updated - - -

    Typical China HuanYang 2,2KW Spindle



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    New problem. I have now spent a good 7 hours finding out the following ...

    I am now using octos. My machine has 4 motors.
    Z = Axis port 1
    X = Axis port 2
    Y1 = Axis port 3
    Y2 = Axis port 4

    If I connect the ErrorPin'S Axis1,2 and 3 via opto, everything works fine.
    If I connect the ErrorPin'S Axis1,2 and 4 via opto, everything works fine.
    If I connect the ErrorPin'S Axis1,2 and 3 and 4 via opto, all alarm signals of the motors are ignored.

    I don't know what to do next.



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Do you use one opto for all 4 drivers? Can you draw quick schematics?

    Error pin uses pull-up resistor.
    If not inverted it needs to be pull-down for normal state or left floating (unconnected) for error.
    If inverted then it is left unconnected for normal state and pulled-down on error.



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    I've tried both. One opto for all axes, but that didn't work at all.
    Then changed back to one Opto per axis. But this only works as long as I stay with three axes.

    no matter how the axis ports are defined. As soon as there are more than 3 error signals, the motor ALM signal are ignored.
    I'm sure it's a bug.

    Alarm Signal: OC output signal, activated when one of the following protection is activated: over- voltage and over current error.
    They can sink or source MAX 8 mA current at 24 V, respectively 200 mW.
    The impedance between ALM+ and ALM- is high for normal operation and becomes low when any protection is activated.

    Last edited by tantemay; 01-05-2020 at 07:17 PM.


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    some Image

    The pin is inverted

    Attached Thumbnails Attached Thumbnails problem with VFD, ErrorPin, JMC Motor ALM-Output-errorpin-problem-jpg  


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    If you connect ALM+ to ErrorPin and ALM- to GND it does not work?

    You can not use opto adapters in parallel. This meany you need to solve this with only one. Your image looks correct. I imagine you connected all 4 motors in parallel?
    In high impendance state opto/input is floating. You need 10k resistor between input terminal and GND (on motor side).



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Quote Originally Posted by PlanetCNC View Post
    If you connectALM+ to ErrorPin and ALM- to GND it does not work?
    That was the problem, which is why I wrote this article. As soon as I start the VFD Motor Spindle, the control goes into the E-Stop.



    Quote Originally Posted by PlanetCNC View Post
    You can not use opto adapters in parallel.
    It works with two optos connected in parallel.
    It works with three optos connected in parallel.
    But not with four optos connected in parallel.
    Look at the pictures

    Quote Originally Posted by PlanetCNC View Post
    This meany you need to solve this with only one.
    I tried that too, it doesn't work at all.

    Attached Thumbnails Attached Thumbnails problem with VFD, ErrorPin, JMC Motor ALM-Output-works-jpg   problem with VFD, ErrorPin, JMC Motor ALM-Output-work-jpg  


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Control goes to E-Stop because spindle creates a lot of EMI on start. Did you install filters to your VFD? All VFDs need to have EMI filter on power supply.

    Unless I missed something (or spindle EMI messes things again) this should work:

    To use opto adapters in parallel resisters on them need to have different values.

    Attached Thumbnails Attached Thumbnails problem with VFD, ErrorPin, JMC Motor ALM-Output-untitled-1-jpg  


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    I am aware that it has to do with EMI.
    The spindle or the native of the VFD is connected to a filter. All cables are shielded.

    Why does it work for me with 3 optos, but not with 4?



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Optocoupler uses 2k pull-up resistor. When triggered it is pulled to ground.
    When you have 4 of them in parallel you basically have 0k5 ohm pull-up pulled to ground by single opto. This is too much. you can even damage it.
    If you want to use them in parallel you should remove 2k resistors from all optos except one.



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Quote Originally Posted by PlanetCNC View Post
    Control goes to E-Stop because spindle creates a lot of EMI on start. Did you install filters to your VFD? All VFDs need to have EMI filter on power supply.

    Unless I missed something (or spindle EMI messes things again) this should work:

    To use opto adapters in parallel resisters on them need to have different values.
    Do I have to consider a construction method, cement, foil? Watt?



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    For the first one I will only use three X and Y1 Y2 axes.
    I have now ordered a 10k resistor. I will report what it showed.



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    Remove 2k resistors from all optos connected in parallel except on one.
    You can simply cut it on one end like on picture. Remember - leave one resistor connected. If you have two opto adapters cut only one on first and both on second.
    You can do this is such way that it cam be restored. No guaranties thou.



    Attached Thumbnails Attached Thumbnails problem with VFD, ErrorPin, JMC Motor ALM-Output-untitled-1-png  


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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    ???? It's bewitched. I read from your posts that it should actually work without optos. So today I have all ALM connected again without opto and it works perfectly.
    Unfortunately, I cannot reproduce the error. So I don't know where it was.



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    Default Re: problem with VFD, ErrorPin, JMC Motor ALM-Output

    I'm glad you fixed this and I hope you will get no more errors.



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problem with VFD, ErrorPin, JMC Motor ALM-Output

problem with VFD, ErrorPin, JMC Motor ALM-Output

problem with VFD, ErrorPin, JMC Motor ALM-Output