Problem Brushless driver alarm ? (or not)


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    Default Brushless driver alarm ? (or not)

    Hello everybody,


    I recently upgraded my 2417 CNC by replacing the original 555 DC (brushed) motor with a 250W brushless spindle set (https://www.aliexpress.com/store/pro...819828853.html). The neatly packaged pink driver is labeled "DC Brushless drive LD-WS4810" from Longdiao. It has two LEDs visible from the outside, labeled "Green LED=POWER" and "Red LED=ALARM".


    When connected to a stabilized 24V/10A supply, the motor turns normally (max speed 12,500 rpm), the green LED is ON, but the red LED is ON also, blinking (frequency ~4Hz). When the control pot is at its minimum, the motor normally stops, the red LED continues to blink, more slowly (~2Hz). When I disconnect the motor, the situation does not change (green ON, red blinking @ ~2Hz). I checked several stabilized 24V supplies : no change.


    I complained to the seller, who answers (quote) "I asked the techiniical staff.flashing red light means it's work normal.no flashing red light means it's work not normal". I am a bit puzzled : I NEVER, EVER saw a device where a red lamp labeled "ALARM" is ON (and blinking, on top of that) when the situation is normal, and goes out when in alarm. I asked for a proper data sheet to support their explanation (in progress). The only info that I could gather using Google was a simple, very basic 10-liner that every seller copy/pastes, and which does not even mention that there are lights, let alone their meaning.


    What is the feeling of the specialists on this forum ? Browsing Ebay and AliExpress, it seems a lot of people sell the device (so I assume a lot of people buy it...), would there be a good soul who would have experience and/or advise ?


    Thanks in advance

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    Community Moderator Al_The_Man's Avatar
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    Default Re: Brushless driver alarm ? (or not)

    Does seem a bit out of the ordinary method, used by the majority if equipment manuf.
    The closest i have seen is the T.M. controller which has a PWM command signal, when power is attached the RED LED is on steady, when a PWM run command is issued it blinks, if a very Slow blink means an error.
    If a proper manual is available , it should show details in there.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
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    Default Re: Brushless driver alarm ? (or not)

    Quote Originally Posted by Al_The_Man View Post
    Does seem a bit out of the ordinary method, used by the majority if equipment manuf.
    The closest i have seen is the T.M. controller which has a PWM command signal, when power is attached the RED LED is on steady, when a PWM run command is issued it blinks, if a very Slow blink means an error.
    If a proper manual is available , it should show details in there.
    Al.
    Good to know, Al, but in my case, there is already a green LED to show that the power is ON. It does not make sense to have an additional one, blinking on top of that. In addition to the previous experiments, when I supply the driver with 12V (instead of the nominal 24V), the red LED is ON permanently. I do not have regulated equipment that goes beyond 24V so I couldn't test.


    I eagerly expect the data sheet, although I am not optimistic (I already spent hours searching. Maybe a 100% Chinese one, not searched by Google would show up ?).



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    Community Moderator Al_The_Man's Avatar
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    Default Re: Brushless driver alarm ? (or not)

    Sounds very close to this one!
    https://www.cnczone.com/forums/gener...ontroller.html
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

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


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    Default Re: Brushless driver alarm ? (or not)

    Quote Originally Posted by Al_The_Man View Post
    Indeed, my dear Sherlock , or his twin brother at least (mine has a 5V speed control line, not 10V). The question still remains : what's behind the "RUN/ALARM" location (are there even two LEDs ?), and if yes, how to they illuminate ?

    Pushing the investigation further : in the link you sent, I found a third "twin" brother (WS55-220). It is designed for 500W but is looking very similar to my WS4810. And for this one, data sheets are available! They all point out to the same direction: blinking red is bad:

    Brushless driver alarm ? (or not)-ws55-220-1-r-gif
    Brushless driver alarm ? (or not)-ws55-220-2-r-gif
    Brushless driver alarm ? (or not)-ws55-220-3-r-gif


    The equipment is designed according to the normal international standards.

    I guess I can exclude a faulty spindle, because the fault is also present without the spindle being connected to the driver. A claim for replacement would then be justified.

    Let's wait for the seller response. In the meantime, any further comment would be welcome.

    Attached Thumbnails Attached Thumbnails Brushless driver alarm ? (or not)-ws55-220-2-r-gif   Brushless driver alarm ? (or not)-ws55-220-1-r-gif   Brushless driver alarm ? (or not)-ws55-220-3-r-gif  


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    Default Re: Brushless driver alarm ? (or not)

    I would expect the driver to detect a fault condition if no spindle is connected. A hall fault is very easy for a driver to detect (and not having the halls connected would be a fault condition,) also depending upon the complexity of the drive (not holding my breath on this one,) detecting no load on the outputs could cause a fault as well.



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    Default Re: Brushless driver alarm ? (or not)

    Quote Originally Posted by skrubol View Post
    I would expect the driver to detect a fault condition if no spindle is connected. A hall fault is very easy for a driver to detect (and not having the halls connected would be a fault condition,) also depending upon the complexity of the drive (not holding my breath on this one,) detecting no load on the outputs could cause a fault as well.
    Thank you for the info : these little beasts are very mysterious indeed for newcomers like me. But in my case, the red LED blinks ALSO when the spindle is connected (flashing rate ~2Hz with speed set to zero through the pot, ~4Hz when actually running, irrespective of the speed).


    The seller never sent me the (probably non-existent) data sheet.


    Anyhow, the case in now moot as AliExpress refunded me. I ordered the WS55-220 device pointed to by Al_the_man. Wait and see.



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Brushless driver alarm ? (or not)

Brushless driver alarm ? (or not)