Solution: When variable frequency speed adopted in Tower crane, it is recommended that a special-purpose motor for variable frequency be used. CHV190 frequency inverter provides close-loop vector control way for hoisting mechanism, open-loop vector control way for luffing and slewing mechanisms, which ensure hoisting mechanism does not slip at low speed and full load, luffing and slewing mechanisms start and brake smoothly. For electric brake, it is recommended that commonly used resistor energy consumption braking way be used. For long working stroke for hoisting mechanism of the tower crane, it is recommended that function of light load for speed rise be used, namely, low speed at heavy load and high speed at low load to improve working efficiency of the tower crane.
- It is highly safe, reliable contracting brake and contact control procedures and special-purpose tower crane control function ensure the tower crane to operate safely and reliably.
- The function of light load for speed rise improves hoisting efficiency of the tower crane and adapts to traditional operation way of general tower cranes.
- It is more energy saving and debugging is more flexible and highly efficient than speed change with traditional wound rotor motor connecting to a resistor in serial.
- It is highly integrated, and special function for the tower crane can be realized without using PLC.