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  1. #1

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    Jul 2022
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    Lightbulb Mitsubishi MELDAS L3/M3 monitor problem

    Hello, I have recently owned a lathe that works on the mitsubishi meldas L3 control. The machine itself was unused for a long time.
    It is known that the memory has been lost due to the long period of non-use, but I have a backup on floppy disks. Hence, I replaced the battery with a new one, connected the power cables and the machine started, the fans from the control cabinet went in motion, the lamp is on, etc. There was nothing on the CRT display, even afterglow, so I ordered the LCD which, when connected, displays the message "no signal input ". Maybe who, who told me about the problem, maybe the wiring diagram for MELDAS L3 / M3?

    PS.
    Maybe information on how to reset the entire driver?



    I send greetings from Poland to everyone.

  2. #2

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    Jul 2022
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    The problem was solved.
    I am posting this comment because someone may have a similar problem with this age control.
    I performed a reset of the entire driver and the monitor responded.
    Attached Thumbnails Attached Thumbnails 295252919_355557766765515_322083291647338219_n.jpg  

  3. #3
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    Yeah, this is one that I actually could have helped you with too, but I'm glad you got your answer..... Looks like yours is in German.

  4. #4

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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    Quote Originally Posted by MrMetric View Post
    Yeah, this is one that I actually could have helped you with too, but I'm glad you got your answer..... Looks like yours is in German.
    So apparently my language is German. I have to change it to English somehow.
    Now I need to do a system backup. Is there an rs232 connection?

  5. #5
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    There is! One of the things I'd highly encourage you to do is join the MEAU website support section. They have a LOT of documents there. The searching isn't really very good, but if you spend some time sifting through the results, you can get all the manuals for the M3/L3 there. Those cover the configuration for the RS232 port.

    I could cut to the chase and give you an abbreviated version here (and, I warn you, the MEAU manuals have everything in them, but they are not the best written documentation in the world!), but I'm currently on vacation. As such, I don't have access to my notes.

    Once you have the serial port configured, you can dump the system parameters, programs, tool info, and command vars to your port. But.... RS232 is never as easy as USB. You must have the correct cable and software running on your PC. If you don't have these setup properly, you'll have issues....

    I can help you on much of this once I get home, but in the interim there are some things you can research. First, you can read through the manuals to determine how you change the language. I think I've seen this before, but I've never actually paid much attention to it because my machine has always been in English when I've tinkered with it. So, you will have to do some research to find the correct parameter to change..... Most of the parameters are written into EEPROM, so you likely have those in the system now without having to do anything. This, of course, means it is an excellent time for you to do the back!

    Sadly, there is one thing that will probably cause you some grief. If your machine has a tool change macro, that is stored in memory that you've lost due to a dead battery and which was subsequently formatted. So you will need to find the macro someplace. Often you can get this from a machine manual or another vendor. And, sometimes everything is in PLC so there is no macro. This is all up to the designer of your machine so I can't tell you what to expect... In fact, I don't even know what brand/model of machine you have....

  6. #6

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    Jul 2022
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    Hello,
    I cannot access the website www.meau.com
    My machine has lost all parameters, unfortunately I do not have a backup for it ... all parameters will have to be written by hand. If you have any documents for meldas M3 / L3, I would be grateful if you could send them to my address: jdamian@o2.pl

    Regards Damian

  7. #7
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    HI Damian,
    I'm back from my vacation now, but I also am in the middle of my "normal" work week. As such, it will take me a bit to gather the information for you. In the meantime, I'd *highly* suggest that you *NOT* mess with the machine before you download (from the machine to the computer) the system parameters. The reason for this is simple.... Most, if not all, of the parameters are written to EEPROM. That means that they *should* still be there. If you start randomly changing things, then you could lose important information.

    Don't get me wrong... You will likely still have some issues because specialized macros such as the tool changer macro are *not* part of the EEPROM. You may find those in your manual for the machine or you might be able to find someone that has what you need. OR it could be that the tool change is all written into the PLC, which is *typically* (but not always) in EPROM.

    I think I gave you a bum steer.... Try the following website:

    https://www.mitsubishielectric.com/f...ual&kisyu=/cnc

    On edit: Interesting... They used to have a lot more manuals. I'm not sure if they have purged things or if there is another site also run by Mitsubishi Automation (although this one looks identical to what I remember). But... Fear not. If absolutely necessary, we can eventually get you the manuals. There are three main ones that cover the M3/L3 (which are essentially the same control). There are several others that cover the amplifiers and such. Don't be afraid to broaden your search to the M300 line as well because those are essentially using the same boards as the M3/L3. And, even the later Meldas line seems to share a LOT in common with the older generation, so you frequently can get useful information from them.

  8. #8
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    I finally found the Manuals in the Mitsubishi website again..... I think you will need to create an account. In addition, it is possible that you will not be able to do this because you are not in the United States. I recall someone else saying they had problems. The following link does give me a list of some M3xx documentation though. Please note that the website search isn't all that great. You have to tinker with it for a while and go through lots of pages. But here *is* a lot of useful information there if you are creative:

    https://us.mitsubishielectric.com/fa...:@owscategory=[CNC%20Controls]&f:@owsfamily=[L3%2FM3]&f:@owsprimarycontenttype=[Manual]

  9. #9

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    Jul 2022
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    MrMetric Thank you for all the tips and help. I am sorry that I am only responding to you now, but I had health problems. I started my machine, my specialist has to check the EPROM memory.
    However, the problem is different ... my machine is not very popular, and I do not have a system backup for it.

  10. #10
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    Re: Mitsubishi MELDAS L3/M3 monitor problem

    EPROM is different than EEPROM. EPROM is very typical for the PLC, but the control was sold in different flavors. Some had RAM for the PLC, so you would have to load the PLC from a disk. This had the advantage of making changes very simple, but the disadvantage of really leaving you in a lurch if the memory went south and you didn't have a backup. Iv'e never seen a machine with a RAM PLC, though, so I don't think it was a common option. EPROM is something that is programed at the factory. EPROMs are spec'd to last about 20 years and then they can start to fail (yes, that should concern you...). EEPROM is electrically erasable programmable memory. It is used by the control to store many, but not all, of the parameters. This is why I am saying that you should make a backup as soon as possible. You may have most of the information you need sitting there!

    Program memory is always in RAM. YOu need a battery to keep that alive while the power is out. Once that battery dies, you lose the memory. This is significant because often the tool changer code will be in a small macro. If you don't have a copy of that in your manual, and the builder can't support you, then you are in a world of hurt. You might not be able to use your tool changer anymore. Sometimes the tool changer is all handled in PLC, however, which (as mentioned) is typically burned in EPROM. If that is the case, then you your machine will survive complete power loss. But, again, EPROMs don't last forever.

    Best of luck!

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