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Theodore Zahov

ACM 16 cannot switch off the device

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Hello,

A week ago I installed on my ACM 16 a new 16-mosfet pcb, which was sent by Gotway after one of the eight MOSFETs on the old pcb blew out. After two days of happy riding since yesterday evening I experience a strange problem. The device cannot be switched off in a usual way by holding down the power switch. It can be turned on, the lights work, but when its on it is not possible to turn it off.

The only way to turn it off is to lift it from the ground, wait for it to switch off the motor and then during the beeps to hold the switch down. Then it switches off.

I re-calibrated the ACM, unplugged the battery from the board, drained the power but nothing changed - it still cannot be turned off the usual way.

Very strange and super problematic. Does somebody has and idea how this could be fixed. Maybe I have a bad luck with those pcb, maybe this one is faulty again, or maybe it is a firmware issue?

Best,

Theo

 

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Very weird behaviour, especially if it was working at first and if you can turn the wheel back on. The first thing I'd check is whether there's no water/mud accumulated on any of the exposed connectors/pcb. For example, on my MCM4 some mud got into the connection at the end of the LED strip causing some weird wheel behaviour. Cleaning it and covering the semi-exposed connection and gap in the shell behind it in hot glue fixed it for good. The second thing I'd check is the power button, cable and plug connecting it to the PCB. e.g. see if you can turn the wheel off by directly shorting the pins on the plug. If all that doesn't solve it, it may be something with the PCB or a faulty firmware version.

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Hello Tomek,

yes, it was working at first. Will check the connections and the switch as per your suggestions and will post the result.

Thank you,

Theo

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@Theodore Zahov, what happens if you lay the wheel on one side? Then you can't turn it off either?

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Hi Mono,

yes that is the other way to turn it off. Laying it on a side and then switching it off.

Investigated a bit further and the conclusion is - the device cannot be turned off until the motor is engaged. When it is not balancing it can be switched off.

Edited by Theodore Zahov
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maybe the control board "thinks" that the wheel is not at zero speed, even when it is. That would explain the behaviour, because the off switch is supposed to work only at zero speed. 

Edited by Mono

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I am suffering this problem of being unable to switch off my brand new (unridden) ACM 1600Wh.  Here are the two videos I've made so far to try to show Gotway what's happening:

This one is the initial explanation after I'd tried to charge it for about 6 hours (note that it was still displaying far from fully charged at that point):

     https://www.youtube.com/watch?v=cBjz8L0lkYw

and this one shows the problem is still there after the battery is disconnected:

https://www.youtube.com/watch?v=M7RYD9bCEQ4

I've also tried leaving it disconnected for a couple of hours but the result is the same.

 

I'm curious if you found a definite solution.

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Posted (edited)

Does it do the same thing while it is plugged into the charger?  Maybe check the control board to see if there is anything shorting out some contacts?  That's weird that you can turn it on, but not turn it off.  It appears like the switch is working as it pages through the different headlight modes.  Did you check to see if there are any shorts in the wiring?  Maybe trace the wiring that goes from the power switch all the way to the control board for any insulation damage.

Edited by Hunka Hunka Burning Love

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The main board obviously (beep) know you are pressing the power button. So, the problem is in the main board, not in the wiring I guess. Somewhere in the chip which should decide about long press (on / off) and short press (light).

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I am being sent a replacement main board that I will fit and let you know what happens.  Obviously Gotway believe it's a main board issue.

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6 minutes ago, Ant said:

I am being sent a replacement main board that I will fit and let you know what happens.  Obviously Gotway believe it's a main board issue.

Make sure you check the connector and look at the pins on the connectors. 

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Carlos, is there something in particular you mean I should look for?  This is a brand new, never ridden machine.  

I'm familiar with building my own computers so I'm assuming the connections will all be quite straightforward.  I will check for any signs of bent or burned pins.

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Hopefully is just a bad connection. Look carefully at the power button harness. Make sure no pins are bent. And see that the pins don't slide up and down in the shell of the connector on the wire harness when the harness is not connected to the board. 

Take nice pictures and post. 

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Posted (edited)
On 4/19/2017 at 1:15 PM, Ant said:

I am suffering this problem of being unable to switch off my brand new (unridden) ACM 1600Wh.  Here are the two videos I've made so far to try to show Gotway what's happening:

This one is the initial explanation after I'd tried to charge it for about 6 hours (note that it was still displaying far from fully charged at that point):

     https://www.youtube.com/watch?v=cBjz8L0lkYw

and this one shows the problem is still there after the battery is disconnected:

https://www.youtube.com/watch?v=M7RYD9bCEQ4

I've also tried leaving it disconnected for a couple of hours but the result is the same.

 

I'm curious if you found a definite solution.

It looks like your hall circuit isbnot working. Check the connnector to hall. It's the smaller cable going. To the inside of the wheel. 

Check the connector and the pins. 

Take close up pictures of the connector for the power switch and for the hall circuit. 

But i believe it's the hall circuit. I think the computer thinks that the wheel is not stopped yet. 

Maybe the App will show that. 

Edited by Carlos E Rodriguez

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Posted (edited)

I will do that Carlos. Thank-you for the tip.  I probably won't have time until the weekend but it would be great if I could find and fix the problem without replacing the board.

 

I had checked when this happened that whether the app showed a non-zero speed.  It was showing zero.

Edited by Ant

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