I have brand new Jansno x50 with S866 controller. The speedometer shows correct speed only when not using the motor. As soon as throttle or PAS is applied, the speed display becomes erratic, changing random number for speed. It works correctly only when the motor is not used. What could be the problem?
Speed on the display incorrect when using the electric motor.
- Thread starter valexy
- Start date
RunForTheHills
1 kW
Perhaps the magnetic field from another wire is interfering with the signal in the wire for the speed sensor. If the bike is brand new you should be able to get warranty support from the manufacturer.
docw009
1 MW
For some reason, these controllers calculate speed differently when under power and when coasting, There is always a speed signal from the wheel for rpm, and they use the wheel size to convert that into mph when coasting, However, under power, they use the motor speed and convert that. To do that, they need the number of magnets in the motor and the internal gearing. For your S866, that's P07, and 86 is typical for a geared fat bike motor. If you put in 0, it might make the conversion go nuts,
Meanwhile, Error 10 is a communication error for your display. A random error 10 might mean the data bits are jumping around between the display and controller and cannot be read cleanly.
Try setting a non-zero P07 and maybe unplug/plug the display connector in case it is loose. Probably a new S866 will fix it. Maybe it cannot keep up with the calculations needed to figurre out speed.
Meanwhile, Error 10 is a communication error for your display. A random error 10 might mean the data bits are jumping around between the display and controller and cannot be read cleanly.
Try setting a non-zero P07 and maybe unplug/plug the display connector in case it is loose. Probably a new S866 will fix it. Maybe it cannot keep up with the calculations needed to figurre out speed.
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