Unresponsive to throttle, MP3 SOLVED!

[Sulanino]

Yup.
Have you also checked if your thumb/twist throttle is working properly?

Yes I have! :-)

-Lasse

[MAGICPIE3FOCUSPOWER]

Hmmm...........you should get a new controller from warranty

That's why I have almost everything spare, you never know when having problems.
And have to order from China/anywhere else.

[Sulanino]

Hmmm...........you should get a new controller from warranty

That's why I have almost everything spare, you never know when having problems.
And have to order from China/anywhere else.

Well, a spare controller costs, in Denmark sent from Gary in Canada, around 220 USD (with Taxes and VAT)
A controller without Taxes and VAT costs around 155 USD.

So I do not have a habit of having many spareparts. Only if it is bought within the European Union. Then I do not have to pay Danish tax and VAT.

-Lasse

[MAGICPIE3FOCUSPOWER]

Aah I have one use and one new controller and usb cable for sale.

[Sulanino]

Support ticket created.

-Lasse

[Sulanino]

New controller from Gary installed. Still no movement... Sorry Gary!

Next I will replace the 3 Hall-sensors in the motor. They may be defect despite they they seemed OK when I measured them.
GoldenMotor have them in their warehouse and will send them to me.
Model: GH141F

I will return with more news when the Hall-sensors have been replaced.

-Lasse

[Sulanino]

Received 8 Hall sensors from Golden Motor (18 USD for shipment, otherwise free of charge).

Hope to get the wheel fixed this weekend.

-Lasse

[Sulanino]

Well, new Hall-sensors was not it.

But some progress have been made. Doing the "throttle check" the wheel turned a few mm. I noticed that the wire I used somehow had become corroded (not knowing the right word for "copper rust" CuSO₄).

Half an hour later I came to the conclusion that with the right resistance (Ohm) between the to pins would make the wheel turn. I havent been able to find the right ohm yet. Measured ohm through the throttle. No matter the throttle position the value was the same. It may be defect.

SO I think that maybe newer MP III controllers have a safety feature. When the throttle comes below a certain Ohm value it cuts power to avoid a runaway bike in case of a short (water, damaged cable, etc).

Can anyone confirm that the "throttle check" works as described?
When pins are shorted the motor goes to the highest speed the controller is programmed to.

Thanks,

Lasse

[Bikemad]

Can anyone confirm that the "throttle check" works as described?
When pins are shorted the motor goes to the highest speed the controller is programmed to.

Hi Lasse, the throttle on the controller is controlled by the voltage output from the throttle hall sensor, not a variable resistor, so to check the throttle operation you would really need to measure the voltage on the throttle signal wire while it is connected and powered up, which is not easy to do on the MPIIIs without removing the controller.
(Motor starts at ~1.25V and Maximum power is reached at ~3.25V)

The GM controllers usually incorporate a safety feature which prevents the motor from running if the battery power is accidentally turned on while the throttle is operated.
This is why testing the motor with a piece of wire bridging the two pins requires the controller to be powered up before the wire is inserted, otherwise the motor is prevented from running due to the controller's built in safety feature.

Alan
 

[Sulanino]

Thanks Alan!

What happens when the controller gets more than 3,25 VDC?
Using a wire the controller gets approximately 5 VDC.


-Lasse

[Bikemad]

If the controller gets more than 3.25 volts (i.e. 5V) it should make the motor run at full speed.

The motor's speed/power only varies while the signal voltage is between 1.25V and 3.25V. Below 1.25V it will not run at all, and above 3.25V it will simply remain on full throttle.

This is why there is a "dead spot" at both ends of the throttle movement, the throttle has to be twisted several degrees before the motor will start, and when riding with full throttle it also needs to be backed off by a similar amount before it has any noticeable effect on the speed.

Alan
 

[Rodmiami]

   Thanks Alan , I always wondered why there was a dead spot on both ends of the twist throttle .Rod

[Sulanino]

Problem solved. 

It was the throttle!  New throttle and now it works! Had I just known that a long time ago. But, I dit the "Throttle check" so I thought the throttle was OK.

So, I can confirm that doing the "Throttle check" bridging the two pins does not help.

Has anyone actually tried the "Throttle check" with succes?

-Lasse

[Leslie]

You cant bridge the pins before the motor is switched on.  If you don't get a kick from the throttle, sometimes I try a 1k resistor.  Ive had controllers that wont work unless there is a drop to the signal through the connected to the hall.  First Ive heard this with the GM controllers.  Maybe my old MP2 needed a resistor to test it.  Its been that long. 

I have one 20" MP3 waiting in Sydney to be cleared and sent to me in Queensland.  I can test a few things to see if anything has changed.

[Sulanino]

Les, it would be nice if You could test it on Your MP3 and see how it behaves.

I have bridged the pins both before and after power has been supplied. No reaction.
Only reaction was when the connection was bad (drop in voltage).

-Lasse