Displays and P-menus
KT-LCD3 (Kunteng) – KT LCD család
Partial data
Entering the menu
General setting: hold a button within 5 s after power-on (button symbol unreadable in the source); no key press for 1 min: setting invalid, returns. Exit: long press, saves.
Parameters
| P-no. | Parameter | Values | Status |
|---|---|---|---|
| Max speed | Maximum speed | Default 25 km/h (range not given in the source) | Sourced |
| Wheel | Wheel diameter | 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 700C, 28 inch | Sourced |
| Units | Units | metric (km/h, km, °C) or imperial (MPH, miles, °F) | Sourced |
| P1 | Motor characteristic | Motor gear ratio × rotor magnet count (rounded), 1–255 | Secondary source – verify |
| P2 | Wheel speed pulses | Pulses per wheel revolution; 0 if not used | Secondary source – verify |
| P3 | Power-assist control | 0: throttle depends on PAS level (other values unclear in the source) | Secondary source – verify |
| P4 | Throttle start-up | 0 = start directly with throttle, 1 = pedalling required first | Secondary source – verify |
| P5 | Battery monitoring | 0 = real-time voltage monitoring; range 0–40 | Secondary source – verify |
| C1–C6 | C parameters | C1 PAS sensor, C2 motor phase coding, C3 assist-ratio initialisation, C4 throttle function (0–5), C5 controller max current, C6 backlight. One source warns that changing these from the display can cause controller failure. | Secondary source – verify |
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.