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  1. #1
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    Default VMC unresponsive

    My company bought a VMC at auction, and it sat for several months before I was hired and tried to use it. It is a generic, brand-less Taiwan-made machine with a Mitsubishi Meldas 64s control.

    I am typing this after our second visit from Mitsubishi and it still doesn't work. According to Mitsubishi, everything they can do has been done and the fault lies with the OEM. Since we don't know who that is, we can't go to them for repair. Can someone recommend a machine tool repairer who can come to Little Rock, AR, and who works on generic Taiwanese machines?

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    Post an picture and maybe I can point you to the manufacturer.

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    Do you have the documentation that came with the machine? Did the Mits tech talk about the "ladder" being gone?

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    Let me rephrase this. I know who the manufacturer is, and it's Chuan-Yuan Automation Ltd., Co. I even have the manuals! However, I would personally consider this generic. This tag is the only identifier on the machine.

    Anyway, I'm not really trying to identify the machine. I'm really just here to get a reference to a shop that works on machines like this.

    img_3585.jpg

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    Quote Originally Posted by Vancbiker View Post
    Do you have the documentation that came with the machine? Did the Mits tech talk about the "ladder" being gone?
    I have all the documentation.

    The first Mitsubishi tech fixed a lot of things that had gone wrong over time before I was hired on, such as the ladder, and he reinstalled the ALL1, ALL2 & ALL3 files. He was unable to diagnose why the shunt breaker tripped when the machine powered on, and he left with the machine still not operational.

    The second Mitsubishi tech was able to get the axes to move and the spindle to turn by tricking the machine into ignoring error codes, but these changes would disappear when the machine is powered down and back up again. He noticed that the spindle oil chiller does not power on, which could be a clue.

    We just wrote a large check for what we thought was going to be just homing the axes, but a two-hour job turned into a two-day job with no positive outcome. Mitsubishi has determined that the problem is with parts of the machine other than theirs, and not something they can fix or diagnose. That's why we need a third party repair shop to come to Little Rock. I'm looking for recommendations.

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    Start from the beginning. What happens afyer you turn it on. EXACTLY. Any alarms? What type of control and drives Etc. Let us try to help u nail down the problem.

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    Quote Originally Posted by Veteran Bicycle View Post
    Let me rephrase this. I know who the manufacturer is, and it's Chuan-Yuan Automation Ltd., Co. I even have the manuals! However, I would personally consider this generic. This tag is the only identifier on the machine.

    Anyway, I'm not really trying to identify the machine. I'm really just here to get a reference to a shop that works on machines like this.

    img_3585.jpg
    Ask them for a refund....

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    Sounds like its time for a retro fit kit- whats that really hot one I keep hearing about? Mach3?

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    Quote Originally Posted by allloutmx View Post
    Sounds like its time for a retro fit kit- whats that really hot one I keep hearing about? Mach3?
    No it is time to stop buying asian junk. Thatn is all.

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    Unresponsive?

    Did you call 911?
    Try CPR?

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    Quote Originally Posted by Veteran Bicycle View Post
    I have all the documentation.

    The first Mitsubishi tech fixed a lot of things that had gone wrong over time before I was hired on, such as the ladder, and he reinstalled the ALL1, ALL2 & ALL3 files. He was unable to diagnose why the shunt breaker tripped when the machine powered on, and he left with the machine still not operational.

    The second Mitsubishi tech was able to get the axes to move and the spindle to turn by tricking the machine into ignoring error codes, but these changes would disappear when the machine is powered down and back up again. He noticed that the spindle oil chiller does not power on, which could be a clue.

    We just wrote a large check for what we thought was going to be just homing the axes, but a two-hour job turned into a two-day job with no positive outcome. Mitsubishi has determined that the problem is with parts of the machine other than theirs, and not something they can fix or diagnose. That's why we need a third party repair shop to come to Little Rock. I'm looking for recommendations.
    Since you have all the documentation, it should not be too big a job for a good CNC tech to figure out the rest. I have no idea if there are any in your area. It's a bit too far for me to travel to....

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    How about laying out the electrical schematic on the table and start looking at brakers for the chiller if that's not working.
    Some machines won't do anything before the chiller turns on.

    If you have all the documentation then start poking around with a multimeter.

    Marko

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    You need a good electrician. The problems with long time stopped machines are always electric. Batteries from axis are new? Batteries from control are new ones?
    Electric schematic book and a good electrician is what you need.

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    Anybody want to take a crack at helping me figure out what to check?

    Attached is the circuit diagram. Again, the Mitsubishi electrical engineer who was on site on Thursday and Friday was very suspicious of the chiller not powering on. I don't if that's a clue or a red herring.

    CIRCUIT DIAGRAM.PDF - Google Drive

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    It would be a good idea to get a local tech. Your prints are good, Mits control is no fun if you don't know your way around it.
    Motor starter KM3 should be pulled in for the Spindle chiller to run. If it is pulled in, check the bottom of FR3 for 3 phase AC line voltage, if voltage is there the chiller should run. If voltage is there but the chiller is not running, the chiller has a problem. It usually has an circuit breaker or fusing in its electrical panel.

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  21. #16
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    To add to ifixcnc's post...

    If KM3 is not pulled in, look at relay CR0. If it is off, look at Diagnostic Y00. If it is 1 then CR0 should be on. If not on, check for a bad relay, bad wiring between I/O board and relay, or bad I/O board (no 24VDC on connector pin B20). If Y00 is 0 then you need to look at the ladder logic to see what conditions need to be met to turn on Y00.

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    Quote Originally Posted by Vancbiker View Post
    Since you have all the documentation, it should not be too big a job for a good CNC tech to figure out the rest. I have no idea if there are any in your area. It's a bit too far for me to travel to....
    Dude from Mitsubishi flew here from Atlanta. For real, do you feel you would be able to tackle this?

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    @Veteran Bicycle

    PM sent.

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    Quote Originally Posted by MJPfin View Post
    Some machines won't do anything before the chiller turns on.



    Marko
    If its a typical Habor chiller, open the top and tap on the relay that's at the very top. These become "sticky" and will prevent the machine from powering up. I've seen this on a few machines. Good luck with your repair.

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    Earlier Mighty Viper cnc's used Mitsubishi controls. The machines are from Taiwan. Maybe you could contact one of their techs.


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