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Thread: MEP-805B 30kw wont stay running

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    Default MEP-805B 30kw wont stay running

    This is a brand new set, I unpacked it from the original crate and foil wrapper papers, only time is/was 2.8hrs testing time before Govt acceptance then packed and stored for the last 18 years.
    I checked it over replaced the batteries, added 10 gallons of fuel ..It started and sounds good. Now comes the situation, it will not stay running ... Cranks starts and very quickly goes into fault of over speed or low voltage. In starting is does not overspeed as it never reaches a steady state or IMO completes the actual starting process, keeping the rotary starting switch engaged as we most often need to do for the 5 & 10kw sets does not effect or keep it going. it simply shuts down... T

    These sets have the Stanadyne pumps whereby no fuel levers or arms are accessible where a person can override the pump once the pumps signal power is stopped and you could, my words, sorta run the set by hand to look for other conditions. I have an extra GAC controller that I am near just temporarily going to wire in and at least run the set for a period of time, I don't expect it to solve my real shutdown cause, its more a feel good thing for me.
    The front control panel does have a NETWORK failure lite/indicator, this is lit and glowing

    Recall please there is a main I/O backplane board where several modules are affixed, the Speed Controller, Voltage Regulator and Paralleling unit. On that same back plane are 2 groups of 8 LED signal/condition for 16 total, these indicate various conditions go and no go so to say. One of these LED indicate a CMOS low voltage condition, I am thinking this is a low memory battery condition, but I have removed the CIM and opened it up but find nothing that looks like the typical CMOS back up battery I am used to seeing. I also am concerned what has happened or not happened while this set has sat boxed and never used once on the past 18 years..

    While I have the -14 manual to help with trouble shooting, I have looked for the -24 but didn't see it, if it
    is here on our SS site, please share with me and I will go look again.

    I welcome help and suggestion please, thanx much.. mac/mc

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    Last edited by Zed254; 09-30-2019 at 06:51.

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    Default

    Can you share the story on how you found one new in the wrapper?

    Robert

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    155mm (09-30-2019), Zed254 (09-30-2019)

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    Chief and Indian 155mm's Avatar
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    Is this a Marine corp set? Does it have silicon/anti tamper on every fitting?

    check the wires that go to the fuel actuator.

    check the magnetic pickup

    change fuel filters.

    what are the rheostats set at on speed control?
    Last edited by 155mm; 09-30-2019 at 11:11.
    "Artillery Brings Dignity to What Would Otherwise Be Just A Vulgar Brawl"

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    Mac,

    as to the CMOS BAT, this is a lithium Battery - because of the 18 years of sitting, it never got charged - see diagrams - is your date and clock off too?
    If so, then lithium Bat is either defective and is probably solderd onto the board or needs to be charged for several hours

    Also, you may have lost the BIOS Settings usually stored if Battery goes dead

    This means you would have to override the board default bios settings with the ones you need for the software version you are running

    this requires boot to bios

    CMOS BAT.jpg

    CMOS BAT 2.jpg

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    Colonel peapvp's Avatar
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    If I am not completely mistaken. then this is the integrated lithium battery as it is exactly next to the Voltage Regulator Circuit
    sat520plus_300px.jpg

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    Update. I feel like I have exhausted my technical ability here to sort out this set and its fault conditions and make it a running functional set. We as a SS community just don't have enough of these in our membership for enough of us to develop trouble shooting experience yet, As the MEP-1000 sets keep being supplied to the users, more of these will become available .. But in this instance I have decided to abandon the CIM and all the digital support package. And revert the set back to stand alone support modules in this instance a new voltage regulator, governor controller and a new operating control system. Last year this same time I had a new 806B with a failed CIM support system, I did the reversion to individual components and it is still in service for that user. These are just too good of sets to be left out of being serviceable because of the digital package failing.. More as it develops. mac/mc

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    Zed thank you for this info I have printed it out and found a lot of good information, I'm sorry I am late seeing this response, again thanx much. mac/mc

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    Peter this is terrific info, I will follow up w u and get more info.. mac/mc

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    155mm I have tried these good suggestions to no avail, today 10/4/19 I did set up a new outboard GAC speed controller and the set ran near perfect, course only about half the CIM controls worked, but all the operating indicators did work well, in this process I did use a load bank and the set easily carried 33% and didn't flinch .. its frustrating that I cant get it all syn'd back up and under full CIM/Digital control. My looking at the CMOS aspect as well likely loss of near if not all original OS during the past 18 plus years, programming loss has to be weighed with a real likelihood I'm not even close to playing with a full deck here toward making this dog hunt. Thanx again for the good suggestions, more if it changes.. mac/mc

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