6F controller stopped working

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pr0ton
Posts: 1
Joined: Mon Mar 30, 2020 4:14 am

6F controller stopped working

Unread post by pr0ton » Mon Mar 30, 2020 4:18 am

Just sent Vlad about this issue, but maybe it's useful to somebody in the public domain too. The controller stopped working when I was riding and pulling ~250W out of it, so no high load. It never has seen high loads anyway cause it's a low-power 250W motor. It's connected to a sensorless 250W motor and 72V (20S) battery. Between ignition wires I can measure the battery voltage. On motor wires there is constantly the battery voltage. Throttle voltage range goes 0.8V - 3.5V, so seems to work as well, as well as the 5V output(s). Motor works fine with other controller.

If needed I can replace parts on the PCB myself, but I have no in-depth knowledge about these circuits or MCU behavior. For example the LVC, how does it work? When it triggers do I need to apply a certain voltage to have the controller operate again? I've also been using the controller with a 36V battery without issues (my BMS has low-voltage protection), so I wonder if LVC is enabled at all.

The controller has never seen any rain and all (solder) connections look fine on the PCB.

Image
Image

PVadmin
Site Admin
Posts: 53
Joined: Sat Feb 09, 2019 5:55 pm

Re: 6F controller stopped working

Unread post by PVadmin » Mon Mar 30, 2020 5:28 pm

Disconnect the controller completely and check for continuity between each phase and positive/negative power connection. There should be no short anywhere. If there is one, the controller can be repaired by replacing the bad mosfet (a shorted one).
pr0ton wrote:
Mon Mar 30, 2020 4:18 am
Just sent Vlad about this issue, but maybe it's useful to somebody in the public domain too. The controller stopped working when I was riding and pulling ~250W out of it, so no high load. It never has seen high loads anyway cause it's a low-power 250W motor. It's connected to a sensorless 250W motor and 72V (20S) battery. Between ignition wires I can measure the battery voltage. On motor wires there is constantly the battery voltage. Throttle voltage range goes 0.8V - 3.5V, so seems to work as well, as well as the 5V output(s). Motor works fine with other controller.

If needed I can replace parts on the PCB myself, but I have no in-depth knowledge about these circuits or MCU behavior. For example the LVC, how does it work? When it triggers do I need to apply a certain voltage to have the controller operate again? I've also been using the controller with a 36V battery without issues (my BMS has low-voltage protection), so I wonder if LVC is enabled at all.

The controller has never seen any rain and all (solder) connections look fine on the PCB.

Image
Image

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