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IndustryArena Forum > CNC Electronics > Spindles / VFD > How to Set up a Huanyang VFD and 2.2KW Air Cooled Spindle
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  1. #61

    Join Date
    Feb 2019
    Posts
    10

    Re: How to Set up a Huanyang VFD and 2.2KW Air Cooled Spindle

    Quote Originally Posted by Eldon_Joh View Post
    The shield should be grounded at both ends from the vfd to the motor. depending on the nature of your machine its also good to ensure an extra ground path from the motor to the frame of the machine, that way in the case of an electrical failure you don't send substantial current through the linear bearings or the ballscrews.

    The 3 phases from the vfd are square waves of continuously varying duty cycle, they average out to get a sine wave current in the motor. the sharp rising and falling edges (and the ringing that occurs) is as high as 400 volts per microsecond and the frequency is as high as 1Mhz. the 350 volt bus of the vfd means there can be substantial current flowing at that frequency, as that +/-170 vdc square wave at the pwm frequency of the drive charges up and discharges the parasitic capacitance of the motor windings to ground, and that's the reason you need to ground the motor.. otherwise you can shock yourself pretty good on an ungrounded motor driven by a vfd, or the current will flow through something else and cause problems.

    even the voltage on the cable can radiate through near field capacitance into other signal wires and mess your machine up, shielding it solves that problem, but only if the shield is grounded to the vfd.
    Square wave pattern. That makes sense.
    Thanks.
    So yeah go ahead and attach the shielding to the earth point on the VFD it can share the motor earth point.
    Then connect the shielding at the other end to the chassis.
    Got it thanks.

    I wonder. Why the Chinese don’t Earth at all!

  2. #62

    Join Date
    Jan 2005
    Posts
    10442

    Re: How to Set up a Huanyang VFD and 2.2KW Air Cooled Spindle

    Quote Originally Posted by simjim33 View Post
    Square wave pattern. That makes sense.
    Thanks.
    So yeah go ahead and attach the shielding to the earth point on the VFD it can share the motor earth point.
    Then connect the shielding at the other end to the chassis.
    Got it thanks.

    I wonder. Why the Chinese don’t Earth at all!
    Only if the Chassis is bonded to Earth / Ground then the shield connection will be affective

    You wonder why the Chinese don't use Earth/Ground connection ( the smart people do), but it really is a secret weapon, it called population control, check out the statistics on electrocution
    Mactec54

  3. #63
    Member
    Join Date
    Jan 2012
    Posts
    2
    Loren,

    I can't thank you enough for these settings. I've been beating my head against the wall for 2 months now with this thing. It worked intermittently, so I kept struggling with it. Yesterday, I finally had enough, and set out to find SOMEBODY who had the correct settings... IN PLAIN ENGLISH.... I tried several others, and they all ended the same.. no bueno. Yours is the first set of clear instructions that actually work flawlessly. So, you helped one guy out here at least, and I wanted to thank you for it! I can sleep now. FYI, I tried the mactec settings and suggestions before, and they didn't work. That's just me I'm sure, but they most certainly did not work. I'm sure he's a smart guy, but at least for me, his settings did not work, yours did. Again, thank you!

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