Six Protection Functions of Inverters
- 著者:Felicia
- 公開：:2022-08-25
Undervoltage Protection & Overvoltage Protection
For all electrical equipments, there is a rated voltage, but in practice, it cannot be fully guaranteed to work at the rated voltage. There is a range near the rated voltage, which is generally required to be +15%. If the voltage is lower than 15%, it is "undervoltage". If the voltage is higher than +15%, it is "overvoltage".
Undervoltage Protection: when the voltage in the circuit drops to a certain value, the inverter will start the undervoltage protection and display.
Overvoltage Protection: when the voltage in the circuit exceeds the predetermined maximum value, the inverter will start the overvoltage protection and display.
Overload Protection & Short Circuit Protection
The difference between overload circuit and short circuit is that the current in the circuit increases by different orders of magnitude.
Overload protection function: the current in the overload circuit is generally 1.5-2 times the rated current of the load. The impact of overload current on the circuit is small. Overload protection belongs to preventive protection function, and the priority of overload protection action is the lowest.
Short circuit protection function: the short circuit current can reach several times of the load current. The impact of short-circuit current is much greater. The priority of short-circuit protection function action is usually the highest.
Polarity Reverse Protection & Over Temperature Protection
Polarity Reverse Protection: when the positive and negative terminals of the input terminal are reversed, the inverter will start the polarity reverse protection and display.
Over Temperature Protection: when the temperature exceeds the set value, the inverter will start over temperature protection and display.
