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  1. #1

    Join Date
    Dec 2019
    Posts
    36

    Question How to detect VFD faults

    After suffering a bad manufacturer-configuration related crash, I decided to basically re-engineer the machine after discovering too many problems everywhere I looked.

    For alarms I decided to go with the failsafe method of normally-connected high (+24V) / active-low (open connection), and hook them all in series along with e-stop.
    I decided to just use estop because I want to keep things as simple & failsafe as possible and don't have a lot of spare controller inputs.
    SO far I've successfully hooked up & tested servo fault alarm outputs and it works well.
    Now I want to add VFD fault output into the alarm chain. But I'm not an electrical engineer and am somewhat confused how to accomplish this.

    In my case I'm using a Fuling DZB312B005.5L2DK VFD.
    Among other issues I've had stop-braking trigger E00A (over-current) alarms that could result in an undetected tool start failure and a crash.
    The manual seems to imply that parameter F2.21's default value of 3 will drive an open-collector signal between A, B, C outputs. (?)
    Which outputs are NO which are and NC is completely unclear but I surmise it's A-B=NO & B-C=NC or the reverse.
    I can't just check resistance with my multi-meter because it needs power but I'm afraid of hooking it up backward or somehow mis-wiring & damaging hardware.

    So my question is, how should I wire this in to my alarm chain of open-collector outputs (effectively NC switches)?
    Can I just hook the hook the end of my chain (which normally is +24V) to B and read C on as the estop (aka alarm) input on the cnc controller?
    Or is it the reverse?

    @mactec54, you seem really knowledgeable about these VFDs. Thanks for your help in the past! Do you have any suggestions or advice?

  2. #2
    Community Moderator
    Join Date
    Dec 2003
    Posts
    23632

    Re: How to detect VFD faults

    Use a configurable output from the VFD that registers a fault etc, and place it in the E-stop NAND string.
    Use the N.C, output which would register open on a fault.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
    Member
    Join Date
    Jan 2005
    Posts
    12063

    Re: How to detect VFD faults

    Quote Originally Posted by dwg123 View Post
    After suffering a bad manufacturer-configuration related crash, I decided to basically re-engineer the machine after discovering too many problems everywhere I looked.

    For alarms I decided to go with the failsafe method of normally-connected high (+24V) / active-low (open connection), and hook them all in series along with e-stop.
    I decided to just use estop because I want to keep things as simple & failsafe as possible and don't have a lot of spare controller inputs.
    SO far I've successfully hooked up & tested servo fault alarm outputs and it works well.
    Now I want to add VFD fault output into the alarm chain. But I'm not an electrical engineer and am somewhat confused how to accomplish this.

    In my case I'm using a Fuling DZB312B005.5L2DK VFD.
    Among other issues I've had stop-braking trigger E00A (over-current) alarms that could result in an undetected tool start failure and a crash.
    The manual seems to imply that parameter F2.21's default value of 3 will drive an open-collector signal between A, B, C outputs. (?)
    Which outputs are NO which are and NC is completely unclear but I surmise it's A-B=NO & B-C=NC or the reverse.
    I can't just check resistance with my multi-meter because it needs power but I'm afraid of hooking it up backward or somehow mis-wiring & damaging hardware.

    So my question is, how should I wire this in to my alarm chain of open-collector outputs (effectively NC switches)?
    Can I just hook the hook the end of my chain (which normally is +24V) to B and read C on as the estop (aka alarm) input on the cnc controller?
    Or is it the reverse?

    @mactec54, you seem really knowledgeable about these VFDs. Thanks for your help in the past! Do you have any suggestions or advice?
    As Al has said you can use the relay output, for a Fault connected to your Estop circuit, S6 / DCM Multi-function input can also be used F2.06=8 For External Fault Input

    E00A Can be an over Voltage supply Fit a line Reactor or a EMI Power Filter can help with this, Can also be Over current when stopping, increase the stopping time, or add a Breaking Resistor

    Power Filter TDK Lambda RSN2030L this is for a 30Amp input you may need different to match you Input Amp rating of your VFD Drive use a higher rating than the VFD Drive requirements
    Mactec54

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