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I was playing around with the battery

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    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?
    Harm Hartsuiker


    #2
    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.
    Peter Lucas

    Comment


      #3
      Yeah it’s allready connected.

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

      Comment


      • King Orro
        King Orro commented
        Editing a comment
        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.

      #4
      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.
      Dan Downs KCRP
      i7-10700K 32GB 3600MHz 3080Ti

      Comment


        #5
        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.
        Omar Josef
        737 FO
        757/767 rated
        Spain

        Comment


          #6
          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.
          Dan Downs KCRP
          i7-10700K 32GB 3600MHz 3080Ti

          Comment


            #7
            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.
            Harm Hartsuiker

            Comment


              #8


              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
              Mike Murphy
              Commercial, Instrument, Rotorcraft-Helicopter

              Comment


                #9
                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.

                https://aviation.stackexchange.com/q...an-airliner-li

                "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"

                Comment


                  #10
                  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?
                  Harm Hartsuiker

                  Comment


                    #11


                    Can you replace the battery through the FAILURE->SERVICE Options?
                    Mike Murphy
                    Commercial, Instrument, Rotorcraft-Helicopter

                    Comment


                      #12
                      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.
                      Dan Downs KCRP
                      i7-10700K 32GB 3600MHz 3080Ti

                      Comment


                        #13
                        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.

                        Comment


                          #14
                          The APU battery is an option that we don't have. It is in the 747/777 models
                          Dan Downs KCRP
                          i7-10700K 32GB 3600MHz 3080Ti

                          Comment


                            #15
                            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

                            Comment


                              #16
                              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.

                              Comment

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