There is a circuit breaker QF and a communication contactor KM between the power supply and the inverter, when the inverter does not need to be used for a long time. or when the equipment is overhauled, the circuit breaker is used as an isolation switch, which can block the power supply and ensure the safety of maintenance. It has maintenance functions such as overcurrent and undervoltage. It can play a certain maintenance effect on the main circuit of the inverter. The effect of the communication contactor is that the power supply of the inverter can be easily turned on or off through the button; The second is when the alarm output terminal of the inverter is acting. The inverter can be quickly disconnected from the power supply through the contactor.
If an inverter only controls one motor, and there is no need to switch with the power frequency, then there is no need to use a thermal relay because the inverter itself has a perfect maintenance function. However, when a frequency converter is connected to multiple motors, or when it is necessary to switch between frequency conversion and power frequency, each motor must have its own thermal relay for maintenance.
The inverter and the motor are generally not connected to the contactor, but it is indispensable in the following conditions: the first situation is that when a frequency converter drags two or more motors, each motor should be equipped with a contactor: the second situation is that the motor needs to switch between the frequency converter and the power frequency, when the motor is switched to the power frequency power supply, it must be connected between the contactor interception and the frequency converter in advance, and obviously a contactor must also be connected with the frequency converter.
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