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Thread: MEP-004A, No output

  1. #641
    General KLChurch's Avatar
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    During the mid 70's to the bottom 90's Analogue controlled metal cutting machines (NC) were more accurate than the CNC machines.
    This is because CNC machines had CPU's that had a speed of approx 4 Mega HZ . 8086 chips. Today the chips they use are 1.8 to 4.9 giga hz. Now the digital (CNC) can machine accurately equal to the analogue machines.
    So how fast are the DMM are sampling? Depends on the CPU. The faster it samples and displays will give you the high and low peaks.
    4 mega hz cnc machines sampled every 20 to 30 milliseconds. With this speed it was difficult to hold plus or minus .005 inch where the nc machines could hold plus or minus .001 inch
    This is my two cents.
    Kris
    Last edited by KLChurch; 10-12-2019 at 18:56.
    Murphy is my friend

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  3. #642
    Colonel peapvp's Avatar
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    Ok,

    The difference is 1 Hz which is 1 cycle per second

    At this frequency it would take the needle app. 1 second to go to 59Hz and another 1 second to go back to 60Hz

    It is basically oscillating at 1 Hz

    Kris's DMM takes 3 samples per second which means the display will update every 333 mili seconds - so it would show the the oscillation

    this would be 6 samples during that 2 second period. This is by far enough time to display the 59Hz if the analog gauge movement would be correct

    I also doubt that the engine with no load is going to vary +/- 30 rpm on a 1 Hz interval with a mechanical governor since frequency is only dependent on rpm

    Now on a malfunctioning Electronic Governor Control that could be possible, but with a mechanical?

    MM2000.png






    Quote Originally Posted by KLChurch View Post
    During the mid 70's to the bottom 90's Analogue controlled metal cutting machines (NC) were more accurate than the CNC machines.
    This is because CNC machines had CPU's that had a speed of approx 4 Mega HZ . 8086 chips. Today the chips they use are 1.8 to 4.9 giga hz. Now the digital (CNC) can machine accurately equal to the analogue machines.
    So how fast are the DMM are sampling? Depends on the CPU. The faster it samples and displays will give you the high and low peaks.
    4 mega hz cnc machines sampled every 20 to 30 milliseconds. With this speed it was difficult to hold plus or minus .005 inch where the nc machines could hold plus or minus .001 inch
    This is my two cents.
    Kris

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  5. #643
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    Update:
    Received back the frequency transducer and starter today.

    I asked the starter repairman why the starter in his opinion failed.
    His comment was it just wore out. Also he believed it was the original equipment not rebuilt.
    He said he put a stronger drive in the unit and other better components in it.
    He stressed to me to make sure the batteries are fully charged each time it is used because it could ruin the starter if the batteries were below par.

    So I will be reinstalling both components
    Kris
    Murphy is my friend

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  7. #644
    4 Star General Guyfang's Avatar
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    AT LAST!!!!!!!!!!!!

    I was starting to dozzzzzzzzze off here. You need to find an old oven to load test with. Not your house.

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  9. #645
    Sergeant Major flydude92's Avatar
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    Sooooo how long does it take to replace a starter?????



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  11. #646
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    Even though the starter seems to be easy to uninstall and install because it is there just looking at you, conventional sockets don't fit. They are too long. The dia bolt pattern should have been 1 inch in dia larger.
    So it takes several open end wrenches and pliers and cheaters to rotate the bolts. Plus band aids when the wrenches slip (knuckle breakers). These are 15/16 bolts not very easy to get to and were very tight.
    On a Cummins engine I could uninstall within 5 mins. This one took hours to uninstall. I just hope I can get the bolts tight enough.
    Kris
    Murphy is my friend

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  13. #647
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    Quote Originally Posted by KLChurch View Post
    Even though the starter seems to be easy to uninstall and install because it is there just looking at you, conventional sockets don't fit. They are too long. The dia bolt pattern should have been 1 inch in dia larger.
    So it takes several open end wrenches and pliers and cheaters to rotate the bolts. Plus band aids when the wrenches slip (knuckle breakers). These are 15/16 bolts not very easy to get to and were very tight.
    On a Cummins engine I could uninstall within 5 mins. This one took hours to uninstall. I just hope I can get the bolts tight enough.
    Kris


    I could have told you that. Its a PITA on a fork lift too!

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  15. #648
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    Starter is installed and gen is ready to start, but after the rain settles down.
    Kris
    Murphy is my friend

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  17. #649
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    Two threads on this MEP-004a genset with 99 pages and 986 posts and you let a little rain get in the way!!! I can't stand the anticipation! This is worse than waiting for the old Nasa Moon mission launches!
    GEN #1 House Gen PU-751/M: 1986 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #2 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #3 Shop/Barn Gen NF-2 Enclosure: 19XX MEP-002a w/Aux Tank
    GEN #4 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 (a work in process)

    * Disclaimer - My comments on this forum are based on my opinion and my experiences only. It is your responsibility to verify any information before using or to hire a professional.

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  19. #650
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    Ha Ha Ha. My mentor said patience is a virtue. Buzzards say patience my ass I'm going to kill something.
    Kris
    Murphy is my friend

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