Displays and P-menus
YL81F LCD (Yolin)
Partial data
Entering the menu
Only when stationary, display on, speed 0; Up/Down selects a parameter, long-press changes, press saves.
Parameters
| P-no. | Parameter | Values | Status |
|---|---|---|---|
| Menu | Personalised settings | Wheel diameter, speed limit, battery power, PAS parameters, password, controller current limit. P-numbering and ranges not verified. | Partial data |
Safe workflow
- Photograph the display label and EVERY original P-value before changing anything.
- Record the controller model, battery nominal voltage, motor and speed-sensor type.
- Find the manual for the exact display + controller; another model's table does not carry over.
- Change one parameter at a time and test on a stand with the wheel raised (brake cut-off, start, every PAS level).
- Never raise the current limit above controller/motor/battery/BMS ratings, never lower undervoltage protection, never bypass the local speed limit.
Common problems
- Inaccurate speed: wheel size, magnet/pulse count, sensor gap and cable; identify the right P-number only from the manual.
- No communication / code 30: protocol (e.g. S866 P20), connector pins, voltage class and display–controller compatibility. Same connector ≠ compatible.
- Wrong battery gauge: the voltage-class parameter (e.g. SW900 P03) must match the real battery; measure with a multimeter first.
- Delayed or intermittent PAS: magnet disc type/count (e.g. SW900 P13), sensitivity, gap and sensor orientation.