(1) Cause of failure

① Judgment of brake handle damage

② Judgment of speed regulating handle damage

③ Motor damage judgment

④ Controller damaged

(2) Troubleshooting

① Unplug the brake handle socket (normally open brake handle). If the motor is running, the brake handle is faulty and should be replaced.

② The 5V voltage of the handle source is normal, detect the signal voltage of the handle, and rotate the handle. The signal voltage should change from low to high at 0.8~4.2V. If the voltage does not change and is less than 1V, the handle is faulty or the handle wire is short circuited. If the voltage is greater than 1V and the change is normal, detect the Hall signal of the motor (yellow, green and blue lines). If the three-phase hall signal line voltage is 5V and the contact is good, the motor hall is damaged, and the motor or the motor hall element should be replaced.

③ Detect the hall signal line of the motor respectively, and slowly rotate the motor by hand. The voltage of each phase should change between 0~5V. If the voltage does not change, the hall of the motor is damaged, and the motor or the hall element of the motor should be replaced. If the voltage transformation of each phase is normal and the power supply is normal, the controller is damaged and replaced.

④ Use a multimeter to check the voltage at the power input terminal of the controller. The voltage should be greater than 36V (the battery is fully charged). If there is no voltage, check the input line. Check the power supply voltage of the controller handle (the red and black wires connecting the handle). The normal voltage is 5~6V. If there is no 5V voltage, unplug the handle socket and the voltage recovers to 5V, it may be that the motor Hall element is short circuited. If there is still no 5V voltage, it is the controller fault and the controller should be replaced.

⑤ First, check whether there is a short circuit between the speed regulating handle and the Hall switch of the motor. Generally, it is easier to cause a short circuit in the connector after rain and dampness. Therefore, pay attention to the waterproof of the handle connector. If the controller is damaged, check whether there is a short circuit between the handle and the Hall switch of the motor before replacing the new controller? Otherwise, the replacement controller will be damaged continuously!

⑥ Or if the motor does not rotate, focus on the inspection of the motor hall switch and the handle signal. If the controller shell is very hot once powered on, generally the power tube inside the controller is short circuited, the power supply should be cut off immediately.