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750c Display Documentation

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    #31
    A bench tested bbsxx unit will always work like that Tinkersmiths. It pretty much needs a load to noticeably vary speed.

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      #32
      Originally posted by ykick View Post

      I have a recently dead 750C laying around. Opened it up and checked out the MS621FE button battery. It’s supposed to be 3V lithium rechargeable but only measuring 1.1V.

      Picture speaks 1000 words - Click image for larger version Name:	image1.JPG Views:	1 Size:	555.9 KB ID:	39901


      Since the display is dead to me I’m not sure if this battery is supposed to have any charge applied as installed in the 750C when connected to a battery pack?

      It seems to be a dutch guy named Frost_Aizmof have the solution!
      https://gathering.tweakers.net/forum...63753#52463753

      Frost_Aizmof post summarized:
      Set auto shutdown off, (otherwise the 750c will auto shutdown :) ) and leave your screen on for several hours, it seems to be that the RTC battery will take charge.

      After 5 hours of continues screen on, the display seems to be remember the correct time!

      ps. I did not removed my 48v battery yet..

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        #33
        That's interesting Petal, did you give it a try with batt disconnected?

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          #34
          Originally posted by Petal View Post

          Frost_Aizmof post summarized:
          Set auto shutdown off, (otherwise the 750c will auto shutdown :) ) and leave your screen on for several hours, it seems to be that the RTC battery will take charge.

          After 5 hours of continues screen on, the display seems to be remember the correct time!

          ps. I did not removed my 48v battery yet..
          I tried the suggestion frost_Aizmof mentioned. I left the screen on for about 5 hours and I shut it down, even unplugged the battery and when I returned an hour or so later, plugged in and turned on the system, the clock was correct! ... but ... this morning I turned it on and it was wrong :( You just don't know how much you need a clock until you have to pull your phone from your pocket each time to check.

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            #35
            Just FYI, I left the bike on overnight, turned it off @ 5am. Checked it when I got home later about 8pm. I turned it on and it had the correct time. So apparently keeping the bike powered on for an extended time helps?

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              #36
              I tried the same thing and it kept the correct time. The true test will be when I pull the battery to charge it at work (unfortunately that test won't happen until January as my office was flooded in Hurricane Harvey and that is when we'll get back into it.).

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                #37
                Confirmed I left my display on for 24 hours, and currently it's displaying correct time after being off for a few 8 and 12 hour bouts. I keep my battery on my bike when charging so always have it connected, no idea if that will affect the time. Thanks for this, finally a basic function working.

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                  #38
                  Thanks so much, really glad to hear it's figured out how to get the internal battery to keep proper time when turned off. I have updated the info at the top of thread and we will make sure to keep folks informed on the procedure for giving the cell that initial charge.

                  Appreciate you guys!

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                    #39
                    On the Luna 750C display unit how to toggle between, odometer, trip time and total mileage.

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                    • dales2ale
                      dales2ale commented
                      Editing a comment
                      12 seconds from MR Mumbles. suspect has something to do with the Menu button.

                    • max_volt
                      max_volt commented
                      Editing a comment
                      The Aussie accent is difficult for many to understand.

                    #40
                    Welp 3 days later clock is incorrect.

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                      #41
                      Originally posted by SM300 View Post
                      Welp 3 days later clock is incorrect.
                      This must be a capacitor battery that has the RTC clock.
                      The capacitor battery should have a distinct place on the PCB, quite large in fact.
                      I don't see it.
                      .
                      .
                      NO AIRBAGS .... WE DIE LIKE REAL MEN

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                        #42
                        Those are gold caps- 1 farad
                        Looks like the button battery has legs that are being surface mounted but the prob may be excessive currant draw.
                        Last edited by max_volt; 10-03-2017, 02:19 PM.

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                          #43
                          So, the reason that I bought this display, the only reason, is to have the throttle power match the PAS level. When I get into the advanced settings, its not even listed as an option to change. What can I do? Literally, I dont need this display if the only reason that I wanted it for is not going to work or even be optional. Any suggestions? Already thinking of returning it, maybe I'm just doing something wrong.

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                          • ykick
                            ykick commented
                            Editing a comment
                            Throttle tied to PAS is a matter of the controller programming via USB and Win OS software. It has nothing to do with the dash/display used. It sounds like your controller/motor using Hot Rod programming.

                            750C has a very good Watt (power) and volt meter which makes it an excellent dash/display for new riders who may not yet fully understand the operational envelope of these mid drive systems. But, the dash/display has nothing to do with the way throttle interacts with PAS.

                          #44
                          Common questions:
                          Password for advanced settings: 1199
                          Throttle is tied to selected PAS level no more full throttle in lower PAS modes
                          How do I access the display settings, basic settings and advanced settings?
                          2 quick pushes of the M button
                          Walk mode for going up stairs?
                          Hold down “-”
                          Night mode?
                          Hold down “+”
                          Reset Odometer?
                          Hold down both “+/ -”S
                          The second line says Throttle is tied to selected PAS level no more full throttle in lower PAS modes.
                          That is what I wanted, its still full throttle no matter what PAS mode I'm in. There also is no option in the display or advanced settings to toggle it on or off, as I have seen in a video linked in this thread.

                          Comment


                          • ykick
                            ykick commented
                            Editing a comment
                            Under advanced menu it says many things with regard to throttle but none of them seem to do anything.

                            As I said before, program the controller to stock Bafang (legal) settings and you can get what you want. Throttle tied to PAS level. No display I'm aware of will do it.

                          #45
                          Anybody know what a 0CH code is on the Luna 750c display? Bike was still on but wouldn't push out any power and was super sluggish. After trying later in the day it worked but after sitting over night the code came back. I noticed from my amp meter the amp draw was jumping all over the place and acting very inconsistent which has never happened before.

                          Comment


                          • paxtana
                            paxtana commented
                            Editing a comment
                            Can you take a pic? Is it recently bought? Have you tried bypassing display using program cable.to see if issue persists?
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