中文
含义
速度信号丢失。主控无法检测到电机转速反馈信号（霍尔传感器或测速绕组信号丢失），电机运行状态不可控。
常见原因
- 霍尔传感器损坏或安装间隙不当
- 测速磁钢脱落或退磁
- 测速信号线断裂或插头松动
- 电机运转但信号线被油污短路
- 主控板速度检测电路故障
- 电机实际停转（E0保护触发后二次报错）
自助排查
- 断电后检查电机测速线束插头是否插紧，重新插拔
- 清洁电机附近油污，特别是霍尔传感器探头位置
- 开启烟机听电机是否有运转声音——如有运转声则信号回路故障，如无声则可能E0/E7前置问题
- 用万用表测量测速信号线在电机运转时是否有脉冲电压输出
- 传感器损坏需更换同型号霍尔元件，线路问题需更换线束
English
Meaning
Speed signal loss. The main control cannot detect motor speed feedback (Hall sensor or tachometer winding signal missing), making motor operation uncontrollable.
Common Causes
- Damaged Hall sensor or incorrect installation gap
- Dislodged or demagnetized speed-sensing magnet
- Broken speed signal wire or loose connector
- Signal wire shorted by grease buildup
- Faulty speed detection circuit on the main control board
- Motor actually stalled (secondary error after E0 protection trigger)
Self-Check Steps
- Power off, check the motor speed sensor harness connector and reseat it
- Clean grease from the motor area, especially around the Hall sensor probe
- Power on and listen — if the motor is running but E8 persists, the signal circuit is faulty; if the motor is silent, a root cause (E0/E7) likely exists
- Use a multimeter to check for pulse voltage on the speed signal wire while the motor is running
- Replace the Hall sensor element if damaged, or replace the harness if wiring is faulty