1. How to check if the electric bicycle suddenly runs out of power?

First check whether the power supply has electricity. If not, check whether the fuse is good. If the fuse is normal and the power supply is out of power, check whether the internal electrode connection of the power supply is loose and whether the battery is open. Generally, the sudden loss of power is basically due to the loose fuse or wiring.

If the power supply has power, check whether the power cord and power lock are normal.

2. How to check if the vehicle has electricity and the motor does not rotate?

Turn the controller up and short the positive red wire and turn the speed yellow wire. If the motor runs normally, the motor and the controller are good, if the motor does not turn, the motor is broken or the controller is broken. If the motor and the controller are normal, If the motor does not turn, it may be a problem with the handle and brake.

3. How to detect brushless motors?

A. Unplug all the plugs of the motor and the wiring harness, use the diode file of the multimeter, and put the red needle of the multimeter on the thin red wire of the six-core plug of the motor, and the black needle on the thin yellow, blue, green and black wires. The value is displayed as 900 Above, put the red needle on the black line, and the black needle on the thin yellow, blue, green and red lines. The value is displayed as 500-600. Displaying zero or infinity is bad.

B. In the power-on state, use the 200 volt DC voltage range of the multimeter. The black needle points to the thin black wire of the six-core plug, and the red needle points to the thin yellow, blue and green wires respectively. Rotate the motor, and the voltage displays 0-6.25 volts. Change between. The maximum value and minimum value of the three lines should not differ much.

4. How to detect the transfer?

Use a multimeter to measure the nine-core plug of the controller with a 20 volt voltage range. The black pen is pointing to the thin black wire and the red pen is pointing to the thin yellow wire. At this time, the voltage should be about 1 volt. Turn the handle to the end, and the multimeter displays 1 volt. To 4.2 volts or 4.8 volts, the switch is good.

5. How to detect the brake lever?

Use a multimeter to measure the controller’s nine-core plug with a 20-volt voltage range. The black pen is pointing to the thin black wire and the red pen is pointing to the thin purple wire. The voltage is about 6 volts. If the voltage is zero, the brake is often powered off. Hold the brake lever. , The multimeter should display zero at this time, and the brake will not power on if the voltage remains unchanged.

6. How to detect the brushless controller?

A. Detection of damage to the power tube: The failure of the power tube means that the vehicle does not turn or lack of phase. The specific measurement method is: use a diode to test the A, B, and C three-phase motor wiring of the controller, and connect the black pen of the multimeter to the power red line , The red pens are connected to the phase wires of the three-phase motor respectively, and the multimeter display value should be about 500-600. If the test result of a certain phase shows zero or very small, the upper power tube of that phase is broken down, and if the display is large, it is a circuit break Connect the red pen of the multimeter to the ground wire of the power supply and the black pen to the phase wire of the three-phase motor respectively. The display value of the multimeter should be about 500-600. If the display is zero or very small, the lower power tube of the phase will break down. Greatly open circuit for the power tube

B. When the power is on, use a multimeter to measure the thin red wire and thin black wire of the controller's nine-pin plug to see if the voltage is about 5 volts. If there is no voltage, the controller is broken.