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Thread: uSDC problems - Zootjeff?

  1. #1
    Constant Bitrate HoSS's Avatar
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    Exclamation uSDC problems - Zootjeff?

    "Please look at product FAQs before sending in questions." - couldn't find that...

    I have a suspected problem with my uSDC.

    Occasionally, It will just power down.
    I first suspected the PC but i have confirmed that it is not with a few substitutions.

    On occasion the PC will boot and then shut down about a minute after.
    On a few other occasions the, when IGN is switched on, the uSDC will just click on and off it's relay at about 1Hz. (this is what leads me towards the SDC)

    SO, a few questions:

    It's been cold here recently, what is the exact operation of the low temperature function?
    Will that just remove power sponatiously?
    Can this be disabled? (I dont need any temp monitoring & a low temp function is fairly useless anyway)

    COuld the voltage monitor just remove power under any circumstances? or is there always a shutdown sequence?

    TIA HoSS

  2. #2
    Variable Bitrate
    Join Date
    Sep 2004
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    291
    HoSS, The oscillation of the relay may be from the temperature sensor, but Jeff will have to answer that one. Our SDC does not have that problem. http://www.mp3car.com/store/product_...products_id=66

    However, you are incorrect about the low temp feature being useless. It is quite useful. Why? Because, when temperatures are too low, the lubrication freezes in moving parts such as your hard drive and fans. This can cause your hard drive not to spin up, and your fans not to spin, which will result in hard drive and fan failure. Hard drives were not designed for extreme cold. According to the hard drive manufacturers, the standard 3.5" hard drives should not be operated below 5 deg C (41 def F).

    KyferEz
    TheCarPCStore.com - Power Controllers (SDC), Inverters, Tank Circuit, GPS, OBDII, CarPCs, and more!
    PSU Wattage Calculator
    Electronics Calculators
    Copper Wire Data

  3. #3
    FLAC
    Join Date
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    Location
    Portland OR
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    1,244
    Quote Originally Posted by HoSS
    "Please look at product FAQs before sending in questions." - couldn't find that...

    I have a suspected problem with my uSDC.

    Occasionally, It will just power down.
    I first suspected the PC but i have confirmed that it is not with a few substitutions.

    On occasion the PC will boot and then shut down about a minute after.
    On a few other occasions the, when IGN is switched on, the uSDC will just click on and off it's relay at about 1Hz. (this is what leads me towards the SDC)

    SO, a few questions:

    It's been cold here recently, what is the exact operation of the low temperature function?
    Will that just remove power sponatiously?
    Can this be disabled? (I dont need any temp monitoring & a low temp function is fairly useless anyway)

    COuld the voltage monitor just remove power under any circumstances? or is there always a shutdown sequence?

    TIA HoSS


    Hi,

    Thanks for you questions.

    Here is some infor that might help:

    The low temperature function will cut all the power when it gets too cold or too hot. Normally this isn't a problem getting too cold because when you get in your car, it doesn't start getting colder. If it is too cold, it won't boot at all. Basically it will flash 3 times quickly if it is in an under temp or over temp situation. If your computer is overheating, you want to cut the power right away, otherwise you'll start a fire. You will know if the temperature sensor is the problem because it will flash 3 times.

    Watching the LED is useful for debugging. When it is runnning, the LED should be full on. When it enters the first timing sequence, it flashes once a second. When it enters the shutdown sequence, it is commited and it flashes twice.

    It sounds to me like your low voltage sense Pot is set for too high a voltage. The Low voltage sense is works the same as if the ACC went away and you set the first timer really small. It should still flash twice in low voltage sense mode. But after 10 seconds of getting a low voltage sense, it will send the pulse to turn off the computer.

    As with the 1hz clicking, how do you have the setup wired up? can you tell me what lines you have connected?

    If the computer On Sense line isn't wired up right, it could put the device into factory test mode which causes the 1hz clicking.


    Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  4. #4
    Constant Bitrate HoSS's Avatar
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    Thanks for the reply Jeff.

    It's wired pretty normally.
    Permanant feed from decent size wires from fusebox, IGN feed from IGN switch.
    Decent wires & solder connections.
    I don't have the cranking delay mode enabled, and I dont have the computer on sense wired at all.
    I don't think that I have moved the voltage sense pot, but I will check that.

    HoSS

    Kyferz - I do appreciate your help, but I was asking the manufacturer the question, not the competitor. It's a bit cheap IMHO to use my post as a chance to sell your product / slag off the opposition....

  5. #5
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
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    Quote Originally Posted by HoSS
    Thanks for the reply Jeff.

    It's wired pretty normally.


    If it turns out there is a problem or you want me to customize the firmware for you, let me know, You can stick it in a padded envelope and mail it to me and I will modify it free of charge.

    Thanks,

    Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  6. #6
    Newbie JohnChimpo's Avatar
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    Nov 2004
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    Tulsa OK
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    i have the same clicking problem in with mine... i will try turning the voltage down tomorrow and see if that works. it just dies alot of the time, i hope that its not just that my car isn't electrically stable enough for it.
    Still attempting an install right now
    Shuttle mobo and case with 2.6 Ghz
    512 mb Ram
    dvd rom
    wireless g
    lilliput 7" ts
    wireless keyboard

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