1. Maintenance process
Step 1: Check whether the mains power supply has electricity, and whether the battery is under voltage 1. Ensure that the 220V AC mains power supply has electricity and the link is reliable; the battery voltage is not lower than 20V (the charger will automatically protect and stop working below 20 volts) . 2. When the battery voltage is lower than 20V, you can short the J2 and J3 connecting lines on the charger circuit board. After the voltage rises to 20V or higher, restore the links of J2 and J3 on the circuit board. 3. If the voltage is not under voltage, please open the charger casing in case of power failure, and observe whether the fuse, transformer, circuit board and other components are obviously burnt or damaged.
Faam FAAM brand battery charger
Step 2: Check if the transformer has output 1. Disconnect the DC terminal and the AC terminal plug. After checking that the charger circuit board is not obviously burnt or damaged, unplug the J2 and J3 pins in the board (the board is completely disconnected). Circuit), use a metal foil or a small piece of metal wire to connect the two plugs J2 and J3 directly. 2. Only connect the AC mains power supply (not connected to the battery DC), use the AC voltage of the multimeter, the black test pen is connected to the position of the screw pile head, the red test pen is connected to the lower right position, and the AC voltage should be about 28V, then Connect the red test lead to the position of the upper pile head (the black test pen position is unchanged), and the AC voltage should be about 28V. If the voltage at any location is incorrect, it can be determined that the transformer is faulty.
Step 3: Check if the rectifier module has output 1. According to the above steps, if the voltages at both locations are normal, switch the multimeter to the DC voltage file, the black test pen is connected to the A position, and the red test pen is connected to the D position. It shows that the DC power is about 36V. If the voltage is very low or there is no voltage output, it can be judged that the rectifier module is faulty. The diode block of the multimeter can also be used to determine if the current interrupt module is damaged.
Step 4: Check the battery charging current 1. If the output voltage of the rectifier module is normal, then do the main circuit charging detection, plug the battery plug, start charging, measure the current with the clamp current meter, if there is a certain charging current (current value The battery is different in quantity and indicates that the entire main circuit is working properly. It can be inferred that the charger fault is caused by the control board. (Note: When the main circuit is charging, the circuit board is completely disconnected, the charging process is not controlled, it can only be counted as time charging test, and can not be charged for a long time).