So I'm setting up my first Adaptto controller, and I ran across an initial set-up and testing issue that has managed to blow MOSFET's on two separate controllers (which I sent back to Adaptto for repair) and then on one of the repaired controllers yet again.
I'm pretty sure I have finally nailed down the root cause, and I wanted to share my profound idiocy with any other poor sap who may be so inclined to test as I do...
The issue (Blowing a MOSFET) arise when you have the following conditions:
1. Using a reed switch/standard ebrake lever (Non-variable regen set-up)
2. Forgetting to change the Regen Setting to "Smooth"
3. Subsequently testing the regen braking function on my test stand with the wheel in the air.
So what happens?...
Normally, (if "Smooth" regen brake function is not activated), the regen brake force is determined by a Hall effect signal (such as an HE throttle) to vary the voltage from +1.0V (Low braking force) to +4.2V (High braking force). However, due to how the "switch type" ebrake levers are wired, using a switch style ebrake lever will send a +5V signal back to the controller, effectively telling it "Brake Hard MFer!". Because that's exactly what my spinning MXUS 3K-Turbo motor did when I pulled on the ebrake lever. It slammed hard to a stop, and the controller ceased to work, showing now the "PROTECT" error when I turn the throttle. I know a FET is blown, because the motor wheel has a good amount of resistance when trying to turn it by hand, when the phases are connected to the controller.
For the record, I do this test frequently, with all the other controllers I build with, but since they are designed for standard
switch ebrake signals, I have never had this issue come up before.
Perhaps Someone may want to add this to the list of
"Don't be a dumb-ass and do this when setting up your controller" list on the user manual. Or maybe I should have RTFM more carefully.