Application of TETRANCA frequency inverter in Wire drawing machine industry
Abstract: Compared with the traditional control method, the use of frequency converter control of construction hoist, not only can avoid the motor in the starting and stopping moment due to the output torque is not enough to produce the phenomenon of “slippery hooks”, but also greatly reduce the impact of the mechanical system, and at the same time improve the smoothness of the operation process and work efficiency. Smoothness and efficiency during operation. In this paper, a company adopts TETRANCA Electric T600 frequency converter control of building lifts as an example, and analyzes the control principle and electrical system of the building lifts in detail.
1. Introduction
The rising, descending and stopping functions of ordinary lifts are realized by contactor-relay control, and the speed is not easy to control, the instantaneous impact of starting and stopping is large, and the damage to the mechanical structure and mechanism is more serious; the running speed is not adjustable, which affects the efficiency of the construction enterprise, and the stopping stability is poor.
Adopting frequency conversion control, it can realize the stepless speed regulation of the starting, accelerating, decelerating and braking process of the construction hoist, reduce the impact of the motor on the mechanical system during the starting and stopping time, improve the smoothness and comfort during the running process of the construction hoist, prolong the service life of the construction hoist, and greatly improve the working efficiency.
This paper analyzes the control principle and electrical system of the construction hoist in detail by taking the construction hoist controlled by T600 frequency converter of TETRANCA Electric of a company as an example.
2. Lift parameters and electrical system
Lift structure sketch shown in Figure 1, the maximum lifting weight of 3.5T, of which the maximum load capacity of 2T, self-weight 1.5T, the maximum lifting speed of 35m / MIN, the maximum acceleration of 0.3G. Lift electrical system mainly consists of the main circuit and control circuit
Electrical transmission part consists of two asynchronous motors, two motors by a T600- 4T37G inverter control, the motor is controlled by a T600- 4T37G inverter control, the motor is controlled by a T600- 4T37G inverter control. 4T37G inverter control, in which each motor has a rated power of 11KW, a rated frequency of 50HZ, a rated speed of 1390 R/MIN, a rated current of 24A, a rated output power of 37KW of the inverter, a braking resistor with a resistance value of 4 ohms and a power of 30KW.
In order to improve the torque of the motor output during starting and stopping, the inverter adopts the open-loop vector control mode and is equipped with a braking unit The inverter adopts open-loop vector control mode and is equipped with braking unit and braking resistor. The frequency converter adopts terminal control mode, through the handle with rise, stop and fall function to control the frequency converter rise, stop and fall input signal. The inverter has two output relays 1 and 2, of which relay 1 is set as the fault output function, and relay 2 is set as the frequency detection function of the inverter output to control the holding contactor of the motor brake.
3. System Debugging
In the case of ensuring that the main circuit and control circuit wiring is correct, the system begins to power on debugging. In accordance with the experimental rules of the construction hoist industry, the commissioning is divided into no-load debugging, 1/2 rated load debugging, rated load debugging and 125% rated load debugging several stages.
Considering the low-frequency torque problem, the frequency converter adopts open-loop vector control mode, so the motor parameters need to be self-learning before commissioning. Parameter self-learning has two kinds of static and dynamic. In the case of the load and reducer can not be disengaged, the static parameters need to be self-learning. In view of the mechanical characteristics of the industry, usually take a static parameter self-learning. Self-learning must be correctly entered before the motor nameplate parameters (F1.02-F1.06), self-learning can be detected after the motor stator resistance, rotor resistance and motor leakage inductance. The mutual inductance and no-load current regulation law of the motor are as follows: Mutual inductance regulation law: 1/2 rated frequency operation, the inverter output voltage needs to be about 190V, if it is low, then moderately increase the mutual inductance value, and vice versa. Rated frequency operation, the frequency converter output voltage needs to be about 380V, if it is low, then moderately increase the mutual inductance value, and vice versa.
No-load current regulation law: no-load current is generally 1/3 of the rated current of the motor, small motor no-load current accounted for the proportion of rated current will be higher, some will reach 50% to 60%.
After the field debugging verification, the lift in the operation process, the motor’s loose holding brake logic is sound, no slippery hook phenomenon, no obvious impact when starting and stopping, in the performance fully meet the user requirements.
4. Conclusion
Adopting TETRANCA Electric T600 frequency converter not only makes the design of the whole electrical system of the building elevator simple and reliable, the whole system is always in a safe operation state, but also can quickly eliminate the system fault through the fault query function of the frequency converter; in the process of starting and stopping, it almost does not feel the impact between the mechanical system, which greatly improves the smoothness and comfort in the process of the elevator’s operation, and at the same time also greatly improve the working efficiency.
