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Thread: Opus and Cold Weather

  1. #1
    Constant Bitrate KaiTech's Avatar
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    Opus and Cold Weather

    Recent tests have shown that the 90W DCX3.1209 may have a low-voltage problem in cold weather.

    Due to low temperature, battery voltage drops under 6V during crank. In a case like this the DCX3.1209 goes in to a state that it can't reset from. In order to work properly it needs to be reset, by unpluging the input voltage for about 30sec.

    To overcome this problem you need to mount a 30V+ diode in series on the Battery input lead to isolate the circuit.
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  2. #2
    Low Bitrate
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    Hey,

    Would you be able to point me in the right direction of a diode part number or similar?

    e.g. would this work?

    http://uk.farnell.com/jsp/endecaSear...=3156552&N=401


    please let me know! cheers!

  3. #3
    Low Bitrate
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    realised link doesn't work.... its part number 40L45CW

    http://www.farnell.com/datasheets/40352.pdf

    Cheers

  4. #4
    Variable Bitrate The Grinch's Avatar
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    I'm not sure just how cold the weather gets where you are, but I would like to suggest upgrading that battery. 6V is pretty low. You should also look at other things like cleanging the battery terminals, and the battery ground points as well. Actually, I've heard that the Big Three mod works wonders.

    Here's a good link to the "Big Three" wire upgrade. http://forum.sounddomain.com/forum/u...=5;t=007801;p=
    Carputer progress meter: [-----|]
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  5. #5
    Low Bitrate
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    My battery is running a clean 12.6V at the terminals connecting to the OPUs power but opus still knocks out even as I connect the power up, I will recheck the ground again but it has been working fine until only recently. Amp is running off the ground point fine, so don't see that as a problem.

    I'm willing to try anything to help my situation, can't seem to start computer at all recently...also got this reply from opus tech support...


    We have recently discovered an issue with low temperatures. The issue is not directly connected to the power supply, but the battery. Whenever the battery voltage drops below 6V-6.5V (happens at low temp.at crank) the power supply gos into a state it cannot recover from.
    In order to prevent this you would need to mount a 30V or higher diode in series on the Batt. input lead (RED). This will isolate the PSU from the low voltage.


    basically what the guy said above..any suggestions on the diode?

    As i said my batt is at 12.6V engine off at the terminals. After leaving the power disconnected, so the psu resets itself, I plug the power back in, but it immediately goes back into protection mode, haven't started the car or touched anything.

    Its a bit disappointing as no others electrics in the car have this problem! I think it was around 2-3 C outside this morning...cold enough for me!

  6. #6
    Variable Bitrate The Grinch's Avatar
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    I don't understand how a diode is supposed to help this problem. A voltage drop is a voltage drop. The OPUS can survive a sudden voltage drop down to 7 volts, but it won't survive a constant voltage under 10.5volts. 6 volts is just out of it's range.

    As far as the P/S not booting up after an excessive voltage drop, I've been told that it's normal. Yes it's annoying. I was having this issue until I redid all my wiring. I replaced crimps or enhanced them by I useing a butane torch to get the wire connections super hot and then added pleanty of solder. My PC starts 100% of the time now, and the speaker pop I was getting at power up has almost vanished.
    Carputer progress meter: [-----|]
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  7. #7
    Tainted Love Cris's Avatar
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    Exactly what kind of temperature are we talking about here?

  8. #8
    Variable Bitrate The Grinch's Avatar
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    Not too cold.

    Quote Originally Posted by cold_fusion
    Its a bit disappointing as no others electrics in the car have this problem! I think it was around 2-3 C outside this morning...cold enough for me!
    Carputer progress meter: [-----|]
    Carputer gadget meter: [--|---]

  9. #9
    Tainted Love Cris's Avatar
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    Thanks...
    This is wierd...

  10. #10
    Constant Bitrate KaiTech's Avatar
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    Quote Originally Posted by The Grinch
    I don't understand how a diode is supposed to help this problem. A voltage drop is a voltage drop. The OPUS can survive a sudden voltage drop down to 7 volts, but it won't survive a constant voltage under 10.5volts. 6 volts is just out of it's range.

    As far as the P/S not booting up after an excessive voltage drop, I've been told that it's normal. Yes it's annoying. I was having this issue until I redid all my wiring. I replaced crimps or enhanced them by I useing a butane torch to get the wire connections super hot and then added pleanty of solder. My PC starts 100% of the time now, and the speaker pop I was getting at power up has almost vanished.
    What it cant take is a peak drop of under 6V, this happens in cold weather at crank (40ms is enough). A diode is supposed to prevent backward current. You can also mount a capacitor for more capacitance, by the diode, on the psu side.
    I'll spout simplistic opinions for hours on end.
    Ridicule anyone who disagrees with me,
    and generally foster divisiveness,
    cynicism and lower level of public dialog!

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