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IndustryArena Forum > CNC Electronics > Spindles / VFD > Spindle Fluctuating Speeds
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  1. #1
    Junior Member
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    Jan 2008
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    238

    Spindle Fluctuating Speeds

    The spindle fluctuates speed.

    Spindle Specs: 2.2kw, 400Hz, 10A

    The VFD outputs 9.98v

    If I set the spindle to 12,000rpm, the return control voltage is a steady 5.82v (should it not be 5.0v?)
    - How can I calibrate that to 5v at 12,000rpm?
    Giving roughly 16,000rpm, but it fluctuates between 16-18,000rpm.

    Any way to correct that? I have not come across anything to help this and seems it might be the VFD itself?

    https://www.youtube.com/watch?v=ZaCG...annel=Mogalize

    Another machine with the same issues:
    https://www.youtube.com/watch?v=1uoz...=CNCWoodworker
    My Build: http://www.cnczone.com/forums/diy-cnc_router_table_machines/113711-my_build_-_many_thanks.html

  2. #2
    Member
    Join Date
    Jan 2005
    Posts
    14722

    Re: Spindle Fluctuating Speeds

    Quote Originally Posted by Mogal View Post
    The spindle fluctuates speed.

    Spindle Specs: 2.2kw, 400Hz, 10A

    The VFD outputs 9.98v

    If I set the spindle to 12,000rpm, the return control voltage is a steady 5.82v (should it not be 5.0v?)
    - How can I calibrate that to 5v at 12,000rpm?
    Giving roughly 16,000rpm, but it fluctuates between 16-18,000rpm.

    Any way to correct that? I have not come across anything to help this and seems it might be the VFD itself?

    https://www.youtube.com/watch?v=ZaCG...annel=Mogalize

    Another machine with the same issues:
    https://www.youtube.com/watch?v=1uoz...=CNCWoodworker
    Do you have a Pot on the Breakout Board that can be adjusted, what control are you using.

    What have you used for wiring the 0-10v Board to the VFD Drive
    Mactec54

  3. #3
    Junior Member
    Join Date
    Jan 2008
    Posts
    238

    Re: Spindle Fluctuating Speeds

    Hi, I am using UC300ETH-UB1 (UCCNC) with a HY02D223B.
    No pot on the BOB.
    Using shielded 16/4 from the UB1 to VFD.

    Wiring:
    UB1 - VFD
    AH1 - 10v - Verified at 9.98v
    AO1 - VI - return voltage at 12,000rpm is 5.82v
    AL1 - ACM

    Everything I have read tells me its the VFD itself, and one has confirmed the same results.
    I've heard of adding a small microfarad cap on the control line, but some had no real results.

    So at this point, I can run it with manual speed control without issues (its how the old machine ran)
    - Manually, the speed is rock solid
    - But I would like to get the speed control working. I'd rather not use the RS485 cable as I have no more USB ports avail.

    What are some reputable VFD's for a 2.2kw spindle with reliable speed control?
    - I'm willing to get a new VFD as this one can be used for another machine.

    Thanks.
    My Build: http://www.cnczone.com/forums/diy-cnc_router_table_machines/113711-my_build_-_many_thanks.html

  4. #4
    Member
    Join Date
    Jan 2005
    Posts
    14722

    Re: Spindle Fluctuating Speeds

    Quote Originally Posted by Mogal View Post
    Hi, I am using UC300ETH-UB1 (UCCNC) with a HY02D223B.
    No pot on the BOB.
    Using shielded 16/4 from the UB1 to VFD.

    Wiring:
    UB1 - VFD
    AH1 - 10v - Verified at 9.98v
    AO1 - VI - return voltage at 12,000rpm is 5.82v
    AL1 - ACM

    Everything I have read tells me its the VFD itself, and one has confirmed the same results.
    I've heard of adding a small microfarad cap on the control line, but some had no real results.

    So at this point, I can run it with manual speed control without issues (its how the old machine ran)
    - Manually, the speed is rock solid
    - But I would like to get the speed control working. I'd rather not use the RS485 cable as I have no more USB ports avail.

    What are some reputable VFD's for a 2.2kw spindle with reliable speed control?

    - I'm willing to get a new VFD as this one can be used for another machine.

    Thanks.
    No never use any caps on anything like this

    How have you terminated the shield this is important

    It's from your control that the voltage is high there has to be some adjustments you can do in UCCNC to get the output voltage lower look at the PWM settings, you should always get the voltage correct at the Board level before connecting to the VFD Drive

    The VFD Drive you have is one of the best low cost, VFD Drives and don't normally have too much problem with speed control I'm surprised though that your VFD Drive does not have the Pot on it, makes me wonder if it is Genuine HY can you post a photo of the Logic Terminals
    Mactec54

  5. #5
    Member
    Join Date
    Jan 2005
    Posts
    14722

    Re: Spindle Fluctuating Speeds

    Quote Originally Posted by Mogal View Post
    Hi, I am using UC300ETH-UB1 (UCCNC) with a HY02D223B.
    No pot on the BOB.
    Using shielded 16/4 from the UB1 to VFD.

    Wiring:
    UB1 - VFD
    AH1 - 10v - Verified at 9.98v
    AO1 - VI - return voltage at 12,000rpm is 5.82v
    AL1 - ACM

    Everything I have read tells me its the VFD itself, and one has confirmed the same results.
    I've heard of adding a small microfarad cap on the control line, but some had no real results.

    So at this point, I can run it with manual speed control without issues (its how the old machine ran)
    - Manually, the speed is rock solid
    - But I would like to get the speed control working. I'd rather not use the RS485 cable as I have no more USB ports avail.

    What are some reputable VFD's for a 2.2kw spindle with reliable speed control?
    - I'm willing to get a new VFD as this one can be used for another machine.

    Thanks.
    I just see something in you Build do you have the VFD Drive on a separate Power source 240V and the cabinet on a 120v supply
    Mactec54

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