BMC 50A controller & 1000W V3 motor

[ebikes-sf]

Finally got error codes from BMC (red LED on controller PCB):

1. Continuously ON: Everything is normal
2. To glitter twice: Braking issue
3. To glitter three times: open circuit or wrong component value between Sense Resistor and LM358
4. To glitter four times: issue of mosfets at low circuit
5. To glitter five times: issue of mosfets at high circuit
6. To glitter six times: issues of 60/120 degrees or motor HS sequence
7. To glitter seven times: over current, too long Sense Resistor Wire, too low setting voltage for short circuit protection
8. To glitter eight times: low supply voltage
9. To glitter two times more quickly: Throttle is not released or over voltage of output of throttle
10. To glitter three times more quickly: lock rotor protection on ( motor is locked )
11.To glitter four times more quickly: disconnection of phase wires
12. To glitter five times more quickly: over temperature protection on

When issues occur, LED will glitter for some times as indicated above and glitter again at regular intervals.

[fechter]

Good work on getting the codes! Very helpful.

I did some measurements with my BMC scooter (non-hub) motor a while back. I was seeing up to 3.5x the battery current on the motor phase wires during heavy load/partial throttle. When the duty cycle of the controller drops below a certain point the output becomes discontinuous, so the 'multiplication factor' no longer follows the duty cycle at very low settings.

[barry955]

I hope someone here can help me with my problem.
I have a jumper that I connect to power up the caps in the controller before I connect the battery +, this prevents the arc.
I forgot to connect this the other day and the result was a big spark when connecting the battery.
Now my BMC 50A controller does not work.
Everything powers up but the throttle does nothing.
I have taken the end plate off and can see the LED blink.
If I connect the power without the motor connected I see six blinks then a two second pause.
This is in the list of blink codes above in this post and correctly indicates that the 60/120 sensors are not connected.
If I have the motor connected I see one blink then a two second pause , this repeats.
This blink code is not listed above. Can anyone help me with what the problem could be.

Even if someone can give me an idea of what component on the board could blow if you get an arc connecting the battery.

[Chuleo]

Sorry for digging out an old thread but I've got the same problem with my BMC 50A controller as the guy in the post before.
The led blinks once then two seconds pause and over again. Does someone know a solution to this problem?

Everything is connected correctly (it used to work that way). I was did a short test ride (max 3 miles) when the motor began to make weird noises like it was out of synchronization. I then shut down everything.. The next day I tried some differet setups (slow/high speed, 30A max/40A max, soft start/normal start) and it was working again. Now on the third day nothing works. If I move the throttle the motor just makes a clicking noise and spins about 90° then stops. The whole setup is brand new (20AH Ping, V4C motor, BMC 50A controller). Every wire is where it should be..

[fechter]

I would suspect a bad hall sensor or connection to the hall sensors. Check the connections first. Make sure the pins are fully inserted in the body.

You can test the hall sensors by using a voltmeter and turning the wheel slowly backward. With the controller on, but no throttle, you can measure the voltage on each hall signal wire. You should see each one alternate 5v on/off as you slowly turn the wheel. Best to measure at the controller to test all the connections between.

You could also have a bad connection on a phase wire or some kind of failure in the controller.

I wish we knew what the blinking codes for the LED are.

[mr.electric]

I found a loose pin in the hall sensor plug but that was not the issue. I was so frustrated with my bmc failure 3 days into a new set up that I switched to using 9c. I have several Ebikes , sold my bmc motors. I think the controller was bad on mine.