Error 7 SW900 Screen

[SamLindley]

Hi,

I have a high powered e bike and it was working great before i went away for a week. When i came back after the week as soon as you apply any throttle pressure or move the bike it appears with error 7 on the SW900 LCD screen.

Im lead to believe this a motor issue

When you apply throttle the motor will kick in for half a second and push it forward before cutting out displaying error 7. Also one light on the controller is steady red and the other flashes green when error 7 shows up.

The bike was extremely cold with condensation over it as it was left in my garage. I thought it may have been the cold weather and brought it inside last night to warm through but this hasnt seemed to fix it. I checked the motor connections on the Sabvaton controller and they seemed to be fine

I have attached some photos

Any help would be greatly appreciated

Thanks in advance

 

[Nealh]

If one suspects camp then 07 motor issue could be hall sensor so carry out a hall diagnosis with a meter.
HallSensorTesting.cdr (ebikes.ca)

 

[SamLindley]

If one suspects camp then 07 motor issue could be hall sensor so carry out a hall diagnosis with a meter.
HallSensorTesting.cdr (ebikes.ca)

I’ve tested this and all the wires except yellow and red change in voltage when the wheel moves

I have the following voltages coming out of the controller for each wire: (with black as ground)
Blue- 3.38V
Green- 3.38V
Yellow- 5.77V
Red- 5.77V
White- 3.79V

I have also attached the wiring diagram I am working off for reference

Thanks for your help so far

 

[Nealh]

Red won't change as it is the 5v input, however the reading is too high for 5v.
White is speed sensor so doesn't really affect the motor running unless the controller requires the speed signal.
Likewise the halls aren't right the Yellow reading like red is out of the normal scale of 5v and the other two are quite low and well under 4v.
There is conflict voltage wise on the 5v line by the looks of it, but where it is ?

What happens to the voltage when the wheel is manually turned slowly backwards ?

 

[SamLindley]

Red won't change as it is the 5v input, however the reading is too high for 5v.
White is speed sensor so doesn't really affect the motor running unless the controller requires the speed signal.
Likewise the halls aren't right the Yellow reading like red is out of the normal scale of 5v and the other two are quite low and well under 4v.
There is conflict voltage wise on the 5v line by the looks of it, but where it is ?

What happens to the voltage when the wheel is manually turned slowly backwards ?

Thanks again for your reply it’s really appreciated

When the wheel is slowly turned backwards the following voltages occur: (with black as ground)
Yellow- Still sits still at around 5.34V
Blue- Fluctuates between 0 and 3V
Green- Fluctuates between 0 and 1.7V

Thanks again

 

[Nealh]

Looks like you will need to renew all three motor hall sensors, they should all read about 5v and then when the wheel is slowly rotated backwards they should switch form 5v - 0v - 5v.

 

[Parsons]

Controller