Before powering up the 400HZ frequency conversion power supply, it is essential to check the surrounding temperature and humidity. If the low-voltage load is not disconnected before the circuit breaker is opened, an electric arc may occur during operation, posing risks to personal and equipment safety. The moment the circuit breaker is opened, there may also be abnormal voltage fluctuations, contaminating the power grid. Excessive temperature can trigger overheating alarms in the frequency conversion power supply, and in severe cases, it can directly damage the power devices and cause circuit short-circuits. Excessive humidity can lead to direct internal short-circuits in the frequency conversion power supply.
During the operation of the 400HZ variable frequency power supply, attention must be paid to the cooling system's functionality, such as whether the air ducts are unobstructed and if there are any abnormal sounds from the fans. Generally, variable frequency power supplies with higher protection ratings, such as those above IP20, can be installed directly without a cabinet. For those below IP20, a cabinet installation is typically recommended. Therefore, the heat dissipation effect of the variable frequency cabinet will directly impact the normal operation of the power supply. Under the condition of low-voltage circuit breakers being closed, directly closing the low-voltage main switch may cause an arc that can injure people. The operation of closing the low-voltage circuit breakers should be performed on an insulating mat. Ensure that the low-voltage main switch is closed first, followed by the individual low-voltage circuit breakers. For the 400HZ variable frequency power supply's exhaust system, it is crucial to check if the fans rotate smoothly and if there is dust or obstructions in the intake, as these are essential aspects of our daily inspections.
Are the motor reactors and 400HZ variable frequency power supplies overheating or emitting odors? Do the variable frequency power supplies and motors produce any abnormal noises? Is the current display on the variable frequency power supply panel too high or does the current change too drastically? Is the output UVW three-phase voltage and current balanced?
