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IndustryArena Forum > MetalWorking Machines > Haas Machines > Haas Mills > Hass VF-0 Spindle Drive Fault Q's, HELP!
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  1. #1
    Join Date
    May 2007
    Posts
    22

    Hass VF-0 Spindle Drive Fault Q's, HELP!

    Hi, I am new to the board and need help bad. I have a 1994 Haas VF0 and today the spindle drive fault is keeping me from cutting metal. The spindle comes on and runs fine at all speeds, but then when I turn the spindle off, or reduce the speed, Alarm goes off. Its not hot yet, fans are working, actually, all the covers are off right now. I can twist wrenches and fix machines all day long, but when it comes to electrical problems (that jiggling wires wont fix), I'm useless. Any help would be apreciated, I can't afford a tech to come out, and this machine is my source of income. Thanks!

    Ryan Moore

  2. #2
    Join Date
    Jul 2005
    Posts
    12177
    This sounds like an open circuit on the braking resistor. That is the thing inside the cage on top of the machine that gets hot.

    When the spindle slows down or stops it does it by rgenerative braking and the controller dumps power onto the DC buss. When the DC buss voltage goes above a certain level the braking resistor, also called the regen resistor is brought into the circuit to bleed off excess voltage. I think there is a relay somewhere that is supposed to close.

    If, for some reason, the circuit to the regen resistor does not close the bud voltage goes up and triggers and overvoltage alarm.
    An open mind is a virtue...so long as all the common sense has not leaked out.

  3. #3
    Join Date
    May 2007
    Posts
    22
    Thanks for the responce. It makes sence to me, but how can I diagnose and fix the problem?

  4. #4
    Join Date
    Nov 2006
    Posts
    63
    Call your local Haas Dealer they are usually real helpful in fixing problems over the phone. If not call Haas Automation 1-800-331-6746 ask for Vertical Service and they could help you. If you need help finding your dealer ww.haascnc.com on their site they have a dealer locator.

  5. #5
    Join Date
    May 2007
    Posts
    22
    Well, I called haas and they stepped me through some diagnostics and come to the conclusion that the Regen Resistor is bad. It read 20 ohms at the spindle drive and should only read 15. The bad news is they want 400 for a new one. Is there any way to repair it?? They also wanted 140 for a 35 dollar gates timing belt on the spindle, so I already know I'm getting shafted!

  6. #6
    Join Date
    Jul 2005
    Posts
    12177
    On my machines the regen resistors look for all the world like the elements on the top of your stove. If I ever need to replace any I will certainly go to the appliance parts store first with my ohmmeter.
    An open mind is a virtue...so long as all the common sense has not leaked out.

  7. #7
    Join Date
    Jul 2005
    Posts
    181
    Agreed with Geof

  8. #8
    Join Date
    Nov 2006
    Posts
    63
    Quote Originally Posted by Ryan Moore View Post
    Well, I called haas and they stepped me through some diagnostics and come to the conclusion that the Regen Resistor is bad. It read 20 ohms at the spindle drive and should only read 15. The bad news is they want 400 for a new one. Is there any way to repair it?? They also wanted 140 for a 35 dollar gates timing belt on the spindle, so I already know I'm getting shafted!

    Take the numbers off of your gates belt to your local automotive store and cross it over. I had a operator error and lost a belt on a Saturday took it to the Local Napa and they fixed me right up!

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