Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[BrianTRice@gmail.com]

Okay, that fuse is labeled F2 on my 2016 board.

It may be related to cell balancing, but I have not confirmed this.


EDIT: I just performed a sanity check about the fuses on the board: the precharge fuse F1 and this fuse F2 are the only obvious fuses on the board, and appear to be identical components for sure. F2 may be "the rest of the board" or something more specific like balancing circuitry.

[iSurgeon]

With the f2 fuse blown I still got pack voltage and 12v from the pins on the battery and to the mbb but when I turned the key on the voltage dropped to 26v and the bike would be dead. The bms status lights were still working and I could connect to the bms with my computer.

[BrianTRice@gmail.com]

Thanks for some troubleshooting indications there. Did the contactor close? Maybe it drives a relay involved in that control.

[iSurgeon]

Yep after changing the fuse I reinstalled the bms board to the battery and pushed the reset button the bike works perfect on that battery, no error codes. My other bms board has other bad components. A few transistors(Q18, Q20, Q45, Q46, Q47, a zener diode z62 and two coils L1 and L2 are burned so I'm searching for a schematic for the bms if it exists.

I'm able to read the markings on the fuse, diodes and transistors with a microscope and ordered some of them from mouser.com but coils l1 and l2 are not marked. If anyone has a schematic of the board or part numbers or values for l1 and l2 i'd appreciate it.

[BrianTRice@gmail.com]

I'm pretty sure the BMS schematic is proprietary between Zero and whatever subcontractor they employ to produce them.

I'll contact you privately about parts listings you've accumulated.