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I was playing around with the battery

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  • 747Mx
    replied
    Originally posted by DDowns View Post
    The APU battery is an option that we don't have. It is in the 747/777 models
    Can’t speak for the 777, but I wouldn’t be surprised if it’s the same, but for the 747, you need both batteries to start the APU. The ship’s battery powers the ECU and the APU battery for cranking the starter. The only way around this is if the plane is equipped with a Battery/TRU switch and not all of them have that. Even then, you still need the Ship’s battery to power the ECU.

    Fortunately with the 747, you don’t need the Ship’s battery to connect ground power. That fact got me out of bind once when I had a plane with the Battery switch left on. Miraculously we were able to get the battery charged enough with the GPU to get the APU going.

    Ryan Collier
    Last edited by 747Mx; 24Jun2022, 02:54.

    Leave a comment:


  • Oneill875
    replied
    Originally posted by DDowns View Post

    I look forward to your follow-up, because I've always suspected that the PMDG model requiring the BATT to be ON to enable the connection of ground power was wrong but I don't have any technical data to back my suspicion. I don't know why Boeing would use a DC power source to enable the connection of the ground AC power source and as an engineer I would design the ground AC power connection such that the relay were powered from the ground source.
    I’m guessing that it’s because at some point there will be a discrete that operates a low voltage coil, that in turn operates the contact for the AC, or several times removed….
    It could also be a safety issue that the plug energises the AC bus un-commanded.

    Dan ONeill

    Leave a comment:


  • DDowns
    replied
    The APU battery is an option that we don't have. It is in the 747/777 models

    Leave a comment:


  • Max Rate
    replied
    Originally posted by Aeromar View Post

    Anyway, what you can do is start the APU. In most airplanes the APU has a dedicated battery.
    I just tried this. Let the battery run out (which took a long time; I believe it went down to only about 5 volts before all the lights finally went out), and then tried to start the APU. No dice. It might work in the real plane, but it doesn't seem to be simulated in the PMDG 737 at least.

    apu.png
    Last edited by Max Rate; 23Jun2022, 22:58.

    Leave a comment:


  • DDowns
    replied
    Originally posted by Helibrewer View Post

    Can you replace the battery through the FAILURE->SERVICE Options?
    No, as I mentioned in post #4 above. I also provided a simulation solution there.

    Leave a comment:


  • Helibrewer
    replied


    Can you replace the battery through the FAILURE->SERVICE Options?

    Leave a comment:


  • Dirtyrockers
    replied
    But the big question then is. Can I get power back in the plane to start it up again? And if so, how?

    I didn’t get any blue light when connecting the ground power. So I couldn’t switch on the ground power bus.

    am I missing something?

    Leave a comment:


  • TH454
    replied
    This is some info on the dead battery/ext power.
    Interesting reading on the subject...well for some i guess
    How valid, i don't know.

    When accidentally leaving the battery switch or something powered by the hot battery bus on over night, an aircraft's battery could completely discharge. Normal startup, where the battery is switch...


    "It is correct that the battery charger will work on the ground service bus, but the external power contactor requires battery power to close. Dead battery, no ground power"

    Leave a comment:


  • Helibrewer
    replied


    This is why ground power connectors use 3 prongs with one being shorter than the others. The first connectors (2 longer ones) power the relay for ground power prior to the 3rd prong connecting the power supply. You should not need the battery

    Leave a comment:


  • Dirtyrockers
    replied
    Well with the dead battery I can’t switch on the ground power.

    so assume that I can’t start the apu either.

    just to clarify. I’m just testing and understanding the mechanics behind the aircraft. Just to see what would happen and what to do in such case.

    Leave a comment:


  • DDowns
    replied
    Originally posted by Aeromar View Post

    Unless it's in the hot battery bus (I'm not sure), you should be able to connect ground power with a dead battery. On many occasions we leave the ground power on with the battery switch in the off position and we even energize the ground service bus in a completely cold and dark cockpit. I'm curious about what'd happen if the battery was completely dead (hot battery bus dead). I'll ask an engineer if I remember.

    Anyway, what you can do is start the APU. In most airplanes the APU has a dedicated battery.
    I look forward to your follow-up, because I've always suspected that the PMDG model requiring the BATT to be ON to enable the connection of ground power was wrong but I don't have any technical data to back my suspicion. I don't know why Boeing would use a DC power source to enable the connection of the ground AC power source and as an engineer I would design the ground AC power connection such that the relay were powered from the ground source.

    Leave a comment:


  • Aeromar
    replied
    Originally posted by DDowns View Post

    Catch 22. The battery is required to operate the solenoid that connects to the ground power. The maintenance menu doesn't have a battery replacement. The easy solution is to simply reload the panel state that you were using.
    Unless it's in the hot battery bus (I'm not sure), you should be able to connect ground power with a dead battery. On many occasions we leave the ground power on with the battery switch in the off position and we even energize the ground service bus in a completely cold and dark cockpit. I'm curious about what'd happen if the battery was completely dead (hot battery bus dead). I'll ask an engineer if I remember.

    Anyway, what you can do is start the APU. In most airplanes the APU has a dedicated battery.

    Leave a comment:


  • DDowns
    replied
    Originally posted by Dirtyrockers View Post
    Hi all,

    got a question, i was playing around with the battery charge, and let it drain totaly dead.

    but now i cant connect ground power. is there a procedure to follow to connect it again?
    Catch 22. The battery is required to operate the solenoid that connects to the ground power. The maintenance menu doesn't have a battery replacement. The easy solution is to simply reload the panel state that you were using.

    Leave a comment:


  • King Orro
    commented on 's reply
    Did you like to play with matches as well?

    AC Ground Power connects direct to the AC Transfer buses. Perhaps this is something PMDG hasn't modelled.
    Last edited by King Orro; 22Jun2022, 23:19.

  • Dirtyrockers
    replied
    Yeah it’s allready connected.

    but can’t switch on the ground power in the overhead.

    Leave a comment:


  • Rev2010
    replied
    Originally posted by Dirtyrockers View Post
    Hi all,

    got a question, i was playing around with the battery charge, and let it drain totaly dead.

    but now i cant connect ground power. is there a procedure to follow to connect it again?
    Press and hold the Menu button on the FMC and it will turn on. Then use Ground Services to request the GPU.

    Leave a comment:


  • Dirtyrockers
    started a topic I was playing around with the battery

    I was playing around with the battery

    Hi all,

    got a question, i was playing around with the battery charge, and let it drain totaly dead.

    but now i cant connect ground power. is there a procedure to follow to connect it again?
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