In the installation of inverter must first understand the use of its occasion, according to the needs of the scene to set up different peripherals. The main peripherals of frequency governor are: air circuit breaker , electromagnetic contactor, AC reactor, braking resistor, DC reactor, output AC reactor, wireless noise filter and so on. The seven major peripherals of the inverter are described in detail as follows: 1, air circuit breakers is not only a normal contact and disconnect the circuit, and can over-current, reverse current, short circuit and loss (under) voltage and other non-normal circumstances of the automatic electrical action. Its main role is to protect the AC and DC circuits within the electrical equipment, you can also operate the circuit infrequently. Used to quickly cut off the frequency converter, to prevent line failure lead to power failure. 2, AC Reactor, also known as AC reactor, AC power reactor coordination, its main function is to prevent the power grid harmonic interference. 3, the AC contactor referred to as the contactor, it is used to shield long-distance access and breaking AC-DC circuit, or large capacitor control circuit of the automatic electrical, mainly for the frequency converter in the event of failure, automatically cut off the main power and prevent Power-down and failure before starting. 4, the radio noise filter, also known as power filter, its main role is to inhibit the conduction of radio signals from the metal pipelines to the device, or suppress interference signals from the interference source device through the power conduction. 5, DC reactor is mainly to suppress the high frequency harmonics generated by the frequency converter, its effect is better than the AC reactor. 6, the output AC reactor, also known as the output side of the anti-jam filter, it is to suppress high-frequency interference filter on the power side of the filter. 7, filter cover is to prevent dust from entering the inverter.