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525rider

Wire question

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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

Edited by 525rider

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Do you have a picture of it? Would help with figuring out what wire you're talking about ;)

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33 minutes ago, 525rider said:

The red one on right.

GetAttachmentThumbnail.jpg

Whoa :o  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)? :P  But at least on mine, I don't that kind of "bullet" connector was used anywhere else except the phase-wires.

Edited by esaj

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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.

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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).

Edited by esaj

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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.

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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!

 

IMG_20150930_210637.jpg

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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. 

 

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