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Thread: System Crash: Electrical Help Needed

  1. #1
    Variable Bitrate nsmoller's Avatar
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    System Crash: Electrical Help Needed

    Let me explain my setup...

    i have a amd mobile on a mATX board with 512 ddr, 1 pci sound card and a 240w power supply. usb devices scattered throughout...

    i have an inverter, the xantrex 700 (600w continuous power)...

    i turn on/off devices with the DSSC by dashwerks... its really great stuff so far.. but right now the 40a relay turning on the inverter is heating up... after about 40 min to 1hr depending upon the volume i keep it at or if i'm running lots of programs...

    current wiring is like this:

    2 relays, 1 30a is connected to dssc, and the other is connected to inverter & ground (40a)...

    i check the setup and it seems the 40a relay is real hot at the time of crash, pc is fine cause it keeps trying to boot. everything will be ok once i give it about 20 minutes to cool down...

    what's my potential solution? chris's brains racked... would a 400w power supply really be any better? i drive 3-5 hours at a clip, plus i think its dumb that the sys would crash at any interval, my cd player doesnt!!!

    i know the carpc controllers relay to the switch... maybe that would be one option... juice the inverter and modify the switch so its on a relay?

    what does everyone think?
    [4Runna]

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  2. #2
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    I could be the wir size that you are running is to small. The contacts of the relay are smaller and are enclosed. The wire can disapate the heat fast due to its lenght and not being enclosed. Also a bad connetion on the relay will cause this. I have a atx with a amd 3.0 Ghz, 512 ddr, 12mb agp graphics, 3 monitors, wi/fi, gps, xm, and it all runs on a 250 watt dc-dc power supply. I can even let my truck sit off for an hour and restart the truck with no computer shut down. I do have 4 awg wire feeding the computer.

  3. #3
    Variable Bitrate nsmoller's Avatar
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    what wire size would you recommend??? can the wires be different sizes at different contacts?

    i'm using those grip things for my relay, so i dont think its a bad connection
    [4Runna]

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  4. #4
    Raw Wave rando's Avatar
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    Your 40A relay is a bit undersized for the maximum input current of your inverter. Still, it's unlikely you're pulling more current than your 40A relay can handle unless you've got other things on the inverter than just the PSU. As xrayman said, the heat generation is probably being caused by too much resistance somewhere in your ciruict. Since the heat is manifesting in the relay, there's a good chance you have a poor connection there.

    The proper connection and wire size are dependent on the maximum current you plan to use. Search Google for lots of advice on how to properly size your wires and connectors. Also, maybe show us a picture of what you have, if you can.

  5. #5
    Raw Wave rando's Avatar
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    Also, it's peculiar that the volume you listen at would have any impact. Is your amplifier power also switched by this relay?

  6. #6
    Variable Bitrate nsmoller's Avatar
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    the amp is powered separately, but turned on by dssc, doubt that effects it
    [4Runna]

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  7. #7
    Variable Bitrate nsmoller's Avatar
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    rando: right - i see what you say about not drawing so much power! as i see it, i'd need to plug in a refridgerator to max that out
    [4Runna]

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  8. #8
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    I still say it is a bad connetion. I have seen it over and over. One of your crimp connectors that is causing the heat from current draw through resitance under load.

  9. #9
    Variable Bitrate nsmoller's Avatar
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    i thought i did it all well? tips for a good connection anyone?
    [4Runna]

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