brake lever causes wheel to reverse spin

[fmpwizard]

Hi,
I have a Vespa imitation electric scooter that came with a 2000w 60v motor and ordered an upgraded controller and motor (along with the lights, throttle, and battery) to be 72V 4000w

Almost everything works well, but when:

1. I turn the scooter on.
2. I see the initial P on the display, so I press the front brake to release the P mode and go into drive.
3. I accelerate (it's on the center stand, the rear wheel is not touching the ground at this point).
4. I let go of the throttle and wait until the wheel is almost stopped, but it is still spinning.
5. I press the front brake (not the rear brake).
6. The wheel spins in the opposite direction, it doesn't keep accelerating in reverse, it is as if it bounces in the other direction.

The brake light comes up when I press the brake.

I tried disconnecting the two "brake lever" cables and follow the same steps, the spinning backwards doesn't happen, but the brake light doesn't come on either.

From the controller harness, I have two pairs of "brake lever" connectors. And each of them seem to behave differently.
One of them does what I described earlier.
The other, on step 6, stops the wheel in place, as if it is an electronic brake.

I uploaded 3 videos showing what I see, I hope someone here can help me so that pressing the brake just turns the brake light on, disables the throttle but doesn't stop the wheel nor does it send it to spin backwards.


Wheel spinning backwards after I press the brake:

Here I use a jumper cable

Here you see how one of the brake connectors "stops" the wheel, instead of sending it to spin in the opposite direction

Thank you!

 

[E-HP]

Do you have a link to the controller? It almost sounds like one brake lever is connected to a self learning jumper.

 

[fmpwizard]

Here is a picture of the label on the controller.
It's a fardriver. Googling the model listed there didn't give me anything but I don't know much about controllers.

I don't have a direct link to the controller from the vendor

 

[fmpwizard]

Uh, that picture looks blurry.

The info is

Nanjing Fardriver IPMSM Controller NS24 Model: WZ72V150A_17_1_H88 Current Line/ Phase: 150A/450A Rated Yoltage: 72V

 

[E-HP]

Can you post a pic of the two brake lever connectors and wires? Were they labeled. I believe the controller has a reverse function, among the other two wire connectors (cruise, alarm, etc.).

 

[fmpwizard]

The brake lever connectors are labeled.
Cruise and reverse were not labeled and I didn't connect anything that wasn't labeled.
The brake level wires are pink and the other is green/yellow .
Also, I tested my original idea that one does something different, that was wrong, it just doesn't spin the other direction depending on how slow the wheel was spinning at first when I jump the green/yellow and pink wires

 

[fmpwizard]

Also, do you have the pin diagram and how the numbers go on this controller? I found one online but it doesn't seem to match the wiring this one has (or maybe I'm not counting the pins in the right order.
Thank you!

 

[fmpwizard]

I figured it out!! The controller came with the regen setting on, after some googling around I found the fardriver app, and what the setting was, after I disable it, now the wheel doesn't spin backwards any more when I press the brake lever (which is connected to the brake high pin in the controller (pin 11)

Thank you!!

 

[stancecoke]

Hm, regen gives a negative iq = torque. So it's normal, that the motor turns backwards with the wheel in the air, if you don't inhibit it by some software logic. That's normal four quadrant operation of a FOC BLDC controller.
But who cares? If you do a normal ride, you will get regen with the brake lever. You won't pull the brake lever, if you don't want to have negative torque....

regards
stancecoke