Help please - Speed no showing

[maviler]

Hi all
I have a Yose power front wheel conversion kit everything worked fine then all of a sudden the speed does not display.
Everything else works fine I can increase PAS levels and there is no issue.

I have check all cables with meter and they are all fine.
I have spoken to Yose support and they reckon i need a new motor.
I am not sold on that idea as it works fine it just dose not get any feedback on speed.

Problem is the unit will auto turn off after 3 mins if there is no speedo.

Any one have any ideas.

Many thanks in advance.

 

[Nealh]

The hub likely has an internal speed sensor and magnet, either the Hall sensor has failed or the magnet has dislodged. One would need to open the hub to see if the magnet has moved, testing the Hall sensor may prove harder as I expect waterproof connectors are used. The magnet is often locate on the inside of the motors cover.

If the motor cover has six fixing screws simply undo them and remove the cover once the wheel is removed to see if the magnet is located on the inside of the cover.

With an extra pair of hands one can test the Hall but would mean opening controller to test. Trace the Gnd and 5v wire and probe the contacts one should see 4.5- 5v registers on the meter, then probe the Gnd and the White speed wire get some one to slowly rotate the wheel and one should see the voltage switch on /off. Some controllers may be potted in compound so one will need to gently bare a tiny bit of wire under the outer sheath for a contact.

One could an external speed sensor and spoke magnet but again any waterproof connectors means one will have to open the controller and solder the three thin wires needed to the pcb or scarf them on to existing wires. The Gnd & 5v wire can be attached to any similar location, the important Signal wire one woud have to cut the White motor sensor Hall wire inside the controller box and join the Signal wire to it.
If one had non waterproof connectors then the job of testing is dead easy.

 

[Nealh]

There is one other option but means buying a spare 9 pin motor cable to make a short Y test lead to rejoin the original cable for continuity. Cut the new cable it in half or cut it so one has two short tails, then use a wire strip joiner with 9 ports (a household electrical wire joint strip will do) rejoin the wires colour to colour and insert the Y lead in between the existing motor cable one then can carry out the Hall test without opening the controller.
Again with battery power probe Gnd to 5v (Black to Red ) to see 4.5 - 5v & then probe Gnd to the White speed wire to see the voltage switch on/off with slow wheel rotation. If both results are as discribed then the Hall is fine if not then the Hall has failed.
Once done simply remove the Y lead and reconnect the motor cable.

 

[maviler]

Hi Nealh
Thanks for the reply.
I did open the motor and the magnet was there and in place.
Can I ask if its the hall sensor, would that not give an error on the controller, or is its sole job just to tell you how fast you are going.

The controller is waterproof and really difficult to get into. so would a tester like the one i have attached do the same job?

Thanks mate

 

[Nealh]

The tester is no good with waterproof connectors, it is for block connector type wiring.

 

[Nealh]

Some controllers give a speed error code some don't.
If the magnet is in position then one needs to test the speed Hall sensor for operation, the speed wire from the motor is White.

 

[maviler]

Thanks mate, I will give it a go.

 

[maviler]

Hi mate
Just to be clear.
The magnet is good as in the picture.


Are there 3 hall sensors in the picture?
If so by probing the controller as you described would that identify which one.


I am going to pry open the controller and do a test.

Thanks
Engin

 

[maviler]

Ok i have probed the 5v and ground that shows up fine.
Then whilst someone was turning the pedal very slowly i probed SS the white wire from the motor and GND and it went from 3v to 2.68v only at one point in the revolution, the rest of the time in the revoltion it is 3v.

Do you think it could the hall sensor(s).

Many thanks

 

[Nealh]

Hi mate
Just to be clear.
The magnet is good as in the picture.
View attachment 48269

Are there 3 hall sensors in the picture?
If so by probing the controller as you described would that identify which one.
View attachment 48270

I am going to pry open the controller and do a test.

Thanks
Engin

The outer Halls are for the motor, the speed Hall is visible and is the Black part located a bit more inboard at the postion marked R1, C1/C2. It is this Hall that needs checking.
We can see the White speed wire marked as sp on the pcb ust below H17, the track to the Hall must be on the u/s of the pcb. The Gnd & 5v is likely on the same rail/track as the other Halls.

 

[Nealh]

The Hall voltage is fairly static, there is isn't enough variation in the voltage for the speed reding to work as the magnet passes by.
Try the same test with ACW slow rotation, if still only 2.68 - 3v then needs a new Hall sensor or one can fit an exterior speed sensor and spoke magnet.

 

[PC2017]

@Ronimo - E-bike forum not PC although we do have a few partakers.

 

[Nealh]

Just report it as a spam bot.