1. What is the general cause of overvoltage of frequency converter?
The overvoltage alarm generally occurs when the machine is stopped, and the main reason is that the deceleration time is too short or the brake resistance and the brake unit have problems.
2. What is the general cause of overheating of frequency converter?
Overheating is also a more common failure, the main reasons: the ambient temperature is too high, the fan is blocked, the temperature sensor performance is poor, and the motor is overheated.
3. In serial communication, what is the unit of transmission rate?
In serial communication, the unit of transmission rate is baud, that is, the number of bits per second transmitted, and its symbol is bps. Commonly used standard baud is 300bps, 600bps, 1200bps, 2400bps, 4800bps, 9600bps, and 19200bps. The transmission rate of different serial communication networks varies greatly, some are only hundreds of bps, and the transmission rate of high-speed serial communication networks can be 100Mbps
4. How many operating modes does the inverter have?
The inverter has the following two modes of operation:
1. Closed-loop operation mode
2. Open loop transport
5. What are the characteristics of voltage source type inverter and current source type inverter?
Voltage source type and current source type frequency converter are AC-DC AC frequency converter, the main electricity
The routing rectifier, flat wave circuit and inverter are composed of three parts.
Since the load is generally inductive, reactive power must be transferred between it and the power source
Therefore, in the middle of the DC link, there is a need to buffer reactive power components.
If a large capacitor is used to buffer reactive power, a voltage source-type inverter is formed
If a large reactor is used to buffer reactive power, it constitutes a current source type inverter.
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