What should I do if the excavator circuit fails?

The power supply is 380V commercial power, and the wiring is from transformer to anti-leakage switch (anti-electric shock circuit breaker). At the outlet end of the circuit breaker, the three-phase four-wire cable is connected to the external junction box of the excavator, thus completing the power supply connection. What are the common maintenance methods for the electrical system of hydraulic excavators? The maintenance master of Komatsu excavator of Japan-Korea Imported Excavator Maintenance (Chongqing) Co., Ltd. said: The maintenance of electrical system mainly includes the following seven aspects.

I. Operating environment

Temperature-10-40, no condensation box below 90RH.

Second, the main control circuit

Excavator maintenance center is composed of main circuit breaker, contactor, frequency converter and variable frequency motor, which belongs to soft start mode, and the power required by power supply is small and the mechanical damage is small. During operation, when the cooling fan is started, press the contactor start button to supply power to the frequency converter. After confirming the power supply, press the inverter start button to start the motor. After starting, the excavator can work normally.

Speed adjustment: After the inverter is powered on, before starting, the speed adjustment knob can be adjusted to the required speed. You can also adjust the speed by turning the speed knob according to the required working state after the inverter is started.

Third, the cooling circuit.

The cooling circuit is led out under the main circuit breaker, which is composed of its own circuit breaker, contactor and fan motor. When starting, close the circuit breaker, press the start button and start the cooling fan. Note: During initial startup (or maintenance or transition), check whether the rotation direction of the fan is consistent with the calibration direction.