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Opus and Cold Weather

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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.
    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!

  • #2
    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!

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

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

      Cheers

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      • #4
        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: [-----|]
        Carputer gadget meter: [--|---]

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        • #5
          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!

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          • #6
            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: [-----|]
            Carputer gadget meter: [--|---]

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            • #7
              Exactly what kind of temperature are we talking about here?
              Renault Megane...the OEM look

              The Lost in Europe Ford Escort

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              • #8
                Not too cold.

                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: [--|---]

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                • #9
                  Thanks...
                  This is wierd...
                  Renault Megane...the OEM look

                  The Lost in Europe Ford Escort

                  Comment


                  • #10
                    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!

                    Comment


                    • #11
                      I'm not electrical savy. I notice my Opus was having the same symptoms right now. PC haven't been up for over 2 days already, and I didn't had the time to trouble shoot.

                      My question is how does the diode put in? I have no idea what series means. Is the diode one directional? which end is supposed to face the battery terminal. I assume it's the (+) terminal of the battery right?

                      Can someone draw me a picture of how it's supposed to look like? Thanks.

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                      • #12
                        Does anyone have a part number for this diode? Exactly how large is a 10 or 15amp diode anyway?
                        Carputer progress meter: [-----|]
                        Carputer gadget meter: [--|---]

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                        • #13
                          It's been cold here in MN last couple of days (4 F or -16 C). Carputer didn't turn on twice already :-( Is there some more information about this solution? Part number, pictures, how to?
                          Thanks

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                          • #14
                            guys,

                            let me share my personal experience with the 90W opus PSU. I experienced the "not booting during the cold" problem myself and what I discovered was that MY PSU simply doesn't function normally (fail to boot) during cold weather. It has nothing to do w/ excessive voltage drop during cranking in cold weather because I disconnected the power to the PSU overnight and in the morning, I started the car without the PSU being connected and then I go ahead and connect the power to the PSU and it still fails to boot (cold weather). What worked for me after that is that I unplug the power from the PSU again and then let the car warm up. After about 30min, I connected the power to the PSU again and it boots up and works just fine.

                            So my conclusion is that I beleive the PSU is just not designed for industrial temp range. Or at least not all the units that they produced works for that range.....

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                            • #15
                              get a battery with a better cold cranking.. like a optima yellow top

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