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IndustryArena Forum > CNC Electronics > Spindles / VFD > Chinese 2.2kw spindle burned out?
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  1. #1
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    Chinese 2.2kw spindle burned out?

    Hi

    I bought the air cooled Hunyang combo from Ebay and it worked great at first.

    I had it cutting a slab of wood and came back about 45 min later and the spindle was stopped. The wood was wrecked and the machine was moving.

    Somewhere it was suggested to check the 4 poles on the spindle itself with an ohmeter, and I found that across ground to pins 1-2 was fine but pin 3 registered as an open circuit. I have gone to the technical support in Hong Kong where they said they would replace and sent them a video/pictures attached for them to make a decision.

    Any guesses as to what happened?

    When it was cutting normally and I went away it was drawing less than 2 amps and running 12,000 rpm.

    Attachment 426908

    Click image for larger version. 

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  2. #2

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by justCNCit View Post
    Hi

    I bought the air cooled Hunyang combo from Ebay and it worked great at first.

    I had it cutting a slab of wood and came back about 45 min later and the spindle was stopped. The wood was wrecked and the machine was moving.

    Somewhere it was suggested to check the 4 poles on the spindle itself with an ohmeter, and I found that across ground to pins 1-2 was fine but pin 3 registered as an open circuit. I have gone to the technical support in Hong Kong where they said they would replace and sent them a video/pictures attached for them to make a decision.

    Any guesses as to what happened?

    When it was cutting normally and I went away it was drawing less than 2 amps and running 12,000 rpm.

    Attachment 426908

    Click image for larger version. 

Name:	CNC.jpg 
Views:	2 
Size:	117.4 KB 
ID:	426910
    With wiring like what I see, I would not be surprised that something like this can happen, You have not used Shielded cable and most likely don't have a Ground from the spindle to the VFD Drive

    12,000 is also most like to slow for your air cooled spindle with only 2A it would not have much torque and would over heat very quickly it the cutter was loaded up

    Things to know more about wiring and drive Parameters

    Over load at low speed most likely caused your problem helped by bad wiring installation
    Mactec54

  3. #3
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    Re: Chinese 2.2kw spindle burned out?

    Most of these spindles are supplied and used unshielded and last forever, I wouldn't worry about that justCNCit unless you're getting interference issues (usually the controller fritzing out and movement stopping rather than the spindle). 12000RPM is also well above the usual danger zone for low RPM and cooling which is usually closer to about 6000RPM. Unless you're loading to the point where it's regularly stalling.

    I'd put this one down to the usual dodgy QA letting through something with a bad solder joint internally and go with the replacement. Just in case, though, when the new one arrives and you start this job up again I'd be keeping a close, close eye on the temperature of the spindle through the first couple of runs. Maybe even lash out a couple of bucks for a cheap thermocouple and temp display to tape to the inside of the spindle cap so you can see if owt's going awry without putting your hand in the way of a moving machine to feel it.

  4. #4

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by dharmic View Post
    Most of these spindles are supplied and used unshielded and last forever, I wouldn't worry about that justCNCit unless you're getting interference issues (usually the controller fritzing out and movement stopping rather than the spindle). 12000RPM is also well above the usual danger zone for low RPM and cooling which is usually closer to about 6000RPM. Unless you're loading to the point where it's regularly stalling.

    I'd put this one down to the usual dodgy QA letting through something with a bad solder joint internally and go with the replacement. Just in case, though, when the new one arrives and you start this job up again I'd be keeping a close, close eye on the temperature of the spindle through the first couple of runs. Maybe even lash out a couple of bucks for a cheap thermocouple and temp display to tape to the inside of the spindle cap so you can see if owt's going awry without putting your hand in the way of a moving machine to feel it.
    You seem to be someone talking with no experience with these spindles and Drives, most air cooled spindles like this have a much higher minimum RPM range, the max Amps is normally 8.5 Amps so at 2 Amps it was not where you would want to be using it

    The wiring is also very important, if you check the code requirement in your country, you can't install a VFD unless it is EMI compliant

    His wiring the way it has been done is a electrical code violation, in the NA
    Mactec54

  5. #5
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    Re: Chinese 2.2kw spindle burned out?

    I run my air cooled spindle at 12,000 rpm all day nothing happens, the min speed is set at 9,000 rpm. Grounding since its a 3 phase has zero to do with it as the ground is for protection or equipment ground when something goes wrong. Shielding or lack of, why would that make the motor burn out?? VFD Parameters set wrong, very well could be, mactec54 can handle that and I would sure check before I installed another spindle. I will agree, the wiring is nothing I would be proud of.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  6. #6
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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by mactec54 View Post
    You seem to be someone talking with no experience with these spindles and Drives...
    Sigh. Whatever, mactec54. I'm not interested in fuelling your righteous rampages any more.

    justCNCit you have two opinions. One, both or neither may be complete fantasy. One, both or neither may be more technically accurate but practically irrelevant. Like with everything else on the interwebs, up to you to filter through the noise (pity there's no shielding wire for that!) and make your own decision.

    WMGEORGE YOU OBVISLY HAVE NO IDEAS ABOT THESE KINDS OF THING EITHER FANCY MEKING SUCH CLAMS THEY NOT LEGAL!!!1!

  7. #7
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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by dharmic View Post
    Sigh. Whatever, mactec54. I'm not interested in fuelling your righteous rampages any more.

    justCNCit you have two opinions. One, both or neither may be complete fantasy. One, both or neither may be more technically accurate but practically irrelevant. Like with everything else on the interwebs, up to you to filter through the noise (pity there's no shielding wire for that!) and make your own decision.

    WMGEORGE YOU OBVISLY HAVE NO IDEAS ABOT THESE KINDS OF THING EITHER FANCY MEKING SUCH CLAMS THEY NOT LEGAL!!!1!
    Huh? I thought they taught spelling in Australia? It looks like you also failed reading skills.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  8. #8
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    Re: Chinese 2.2kw spindle burned out?

    Jokes man, I agree entirely with you. That line was mashed out to save mactec the bother. In exactly the correct spelling for "angry old man foaming at the mouth in rage at the world for not agreeing with him" rather than civilised English or American.

  9. #9

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by dharmic View Post
    Jokes man, I agree entirely with you. That line was mashed out to save mactec the bother. In exactly the correct spelling for "angry old man foaming at the mouth in rage at the world for not agreeing with him" rather than civilised English or American.
    Even in your country this wiring would not pass code, so you obvious don't know what you are looking at or anything about wiring (wedge)

    The main Power supply cable looks like 15A may be 20A rated Romex cable this is used for in the wall for House wiring

    You don't use a Neutral white wire as a Hot 120V in his case without it being covered at both ends with red or black then on the other side 3Phase white and Green Ground are being used as Hot wires :nono:

    Take a very good look and you will see 3 Cables connected to the in/out Power Terminals there should only be 2 Cables ( 1 240v Single Phase ) for the input Power Supply and ( 1 3Phase) to the Spindle
    Mactec54

  10. #10

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by wmgeorge View Post
    I run my air cooled spindle at 12,000 rpm all day nothing happens, the min speed is set at 9,000 rpm. Grounding since its a 3 phase has zero to do with it as the ground is for protection or equipment ground when something goes wrong. Shielding or lack of, why would that make the motor burn out?? VFD Parameters set wrong, very well could be, mactec54 can handle that and I would sure check before I installed another spindle. I will agree, the wiring is nothing I would be proud of.
    Not all these spindles are created equal some have a minimum RPM of 18,000 his could well of been one of them we don't have the spindle spec's

    A Ground is very important for these spindles as they can be damaged by the EMI when they don't use a shielded cable, if they have a Ground wire the EMI and Rotor Voltage will use the Ground wire and save the spindle
    Mactec54

  11. #11
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    Re: Chinese 2.2kw spindle burned out?

    EMI and RFI can raise havoc with control wiring to the VFD and other parts of the system, but will never damage a motor.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  12. #12

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by wmgeorge View Post
    EMI and RFI can raise havoc with control wiring to the VFD and other parts of the system, but will never damage a motor.
    Really you should keep these thoughts to your self, as I can show you a photo of a burnt up spindle caused by back EMF and Rotor Voltage, EMI can have the same affect but normally wipes out electronics as you say

    Most VFD manufactures give you guide line as to how there VFD Drive should be wired and what to use for cable, a snip below from a VFD Drive manufacture

    His spindle as I said most likely stalled and went into over voltage / over current and failed

    The wiring is so badly done it had to be part of this thread not necessarily the cause of the problem but did not help
    Mactec54

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