525rider Posted April 6, 2016 Share Posted April 6, 2016 I had unexpected shut off riding about 12mph with 70% on battery charge on a flat road. After that the unicycle wouldn't start, next day it came on and right off and it would act like that since. When I was taking the left side off I noticed that the single wire connector was loose. My question is : what is this wire for and could it cause shut off? Thanks Link to comment Share on other sites More sharing options...
esaj Posted April 6, 2016 Share Posted April 6, 2016 Do you have a picture of it? Would help with figuring out what wire you're talking about Link to comment Share on other sites More sharing options...
525rider Posted April 6, 2016 Author Share Posted April 6, 2016 The red one on right. Link to comment Share on other sites More sharing options...
esaj Posted April 6, 2016 Share Posted April 6, 2016 33 minutes ago, 525rider said: The red one on right. Whoa That looks like one of the motor phases... disconnect the batteries, open up the entire thing, find the other end (one end should go the mainboard and the other to the motor) and plug it back in (and make sure it's properly insulated so it can't short anywhere). Actually, if it indeed is the motor phase, what is it doing there (front side of the wheel)? But at least on mine, I don't that kind of "bullet" connector was used anywhere else except the phase-wires. Link to comment Share on other sites More sharing options...
525rider Posted April 6, 2016 Author Share Posted April 6, 2016 It comes from left side shell battery compartment and looks like it goes to the main board, it is pretty thin gauge wire for the motor phase, I'd think, maybe 18. Link to comment Share on other sites More sharing options...
esaj Posted April 6, 2016 Share Posted April 6, 2016 16 minutes ago, 525rider said: It comes from left side shell battery compartment and looks like it goes to the main board, it is pretty thin gauge wire for the motor phase, I'd think, maybe 18. My older mainboards have an "extra" wire that goes to the BMS of the packs (F260, double-pack), but the newer one doesn't have it anymore. It used a different type of connector on mine though. Anyway, if the wire is there in the mainboard, it needs to be connected. On mine the wheel starts repeating something like "Low battery or bad cell in battery" if the wire is disconnected and won't power up properly (the motor remains disengaged). Link to comment Share on other sites More sharing options...
525rider Posted April 6, 2016 Author Share Posted April 6, 2016 I tried to connect the wire and it seems to work, after disconnecting it shut off, it came apart by itself when spitting the shells, so I think it was the cause. Link to comment Share on other sites More sharing options...
dmethvin Posted April 6, 2016 Share Posted April 6, 2016 Yeah that's definitely the old-style BMS sensor that connects to the control board. The first battery pack I got had this connector, but the control board didn't have the matching connector. They had just wired the control board connector to ground. The replacement battery didn't have the connector at all. I have no idea what it does but it must not be critical. If the wheel shuts down completely when the connector comes apart I'm glad I don't have it! Link to comment Share on other sites More sharing options...
DBr Posted April 17, 2016 Share Posted April 17, 2016 At my F528 (bought in Sept. 2015) this sigle wire (both battery packs have such a sigle wire) is connected via the main switch to the main board. Refer also to the following thread and the embedded wire drawing from the battery packs, but I have still no information about the function / task. Link to comment Share on other sites More sharing options...
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