Application of Easy Drive GT200 Inverter in Hoist System

With the continuous improvement of the requirements for the speed regulation performance of the lifting equipment in the industrial and mining production, the traditional equipment speed regulation method is the winding rotor asynchronous motor rotor series resistance speed regulation. Regular maintenance often causes failures due to slip rings and brushes, coupled with the use of a large number of relays and contactors, resulting in a large amount of on-site maintenance, a high failure rate of the speed control system, and a relatively high comprehensive technical index of the speed control system Poor, it can no longer meet the special requirements of industrial production. This article introduces the use of easy-drive GT200 series 160kW frequency converter to transform the hoist system.

With the continuous improvement of the requirements for the speed regulation performance of the lifting equipment in the industrial and mining production, the traditional equipment speed regulation method is the winding rotor asynchronous motor rotor series resistance speed regulation. Regular maintenance often causes failures due to slip rings and brushes, coupled with the use of a large number of relays and contactors, resulting in a large amount of on-site maintenance, a high failure rate of the speed control system, and a relatively high comprehensive technical index of the speed control system Poor, it can no longer meet the special requirements of industrial production. This article introduces the use of easy-drive GT200 series 160kW frequency converter to transform the hoist system.

2. On-site technical data collection

Application of Easy Drive GT200 Inverter in Hoist System

3. Disadvantages of the original lifting system

The speed regulation of the motor rotor series resistance speed regulation system belongs to stepped speed regulation, open loop control, small speed regulation range, low speed regulation accuracy, and crawling speed is not easy to control, especially when heavy objects are lowered, dynamic braking and rotor series resistance are required It is not easy for the driver to control, and the safety performance is poor. When decelerating and lowering heavy objects, putting in dynamic braking not only consumes external DC power, but also consumes the regenerative power of the motor on the resistance of the rotor connected in series, wasting a lot of power, and the amount of operation and maintenance is large. high cost.

Fourth, the advantages of easy drive inverter after transformation

After AC variable frequency speed regulation technology is applied to hoist equipment, compared with the traditional wound asynchronous motor rotor string resistance speed regulation system widely used in the market, it can bring the following significant economic benefits and safety and reliability:

(1) The frequency conversion hoist runs smoothly, starts and brakes smoothly, the vibration and impact of the whole machine are obviously reduced during acceleration and deceleration during operation, the safety is improved, and the life of the mechanical part of the crane is prolonged.

(2) The mechanical brake works when the motor is at low speed, and the braking is completed by the electric brake. Therefore, the service life of the brake pads of the mechanical brake is greatly extended, and the maintenance cost is reduced.

(3) Short-circuit the winding rotor part to avoid the motor damage or failure to start due to poor contact caused by the slip ring and brush wear or corrosion.

(5) The number of AC contactors is greatly reduced, and the main circuit of the motor realizes non-contact control, which avoids the damage of the motor caused by frequent contact of the contactor and the damage of the motor caused by the burning of the contactor of the contactor.

(6) The AC frequency conversion speed regulation system can flexibly adjust the speed and acceleration and deceleration time of each gear according to the site conditions, making the frequency conversion crane flexible in operation and good on-site adaptability.

(7) The AC variable frequency control system is a high-efficiency speed control system with high operating efficiency and low heat loss, so it saves a lot of electricity compared with the old speed control system.

(8) The frequency converter has perfect protection, monitoring and self-diagnosis functions. If combined with PLC control, the reliability of the Electronic control system of the frequency conversion crane can be greatly improved.

Five, scene pictures

Application of Easy Drive GT200 Inverter in Hoist System

Application of Easy Drive GT200 Inverter in Hoist System

Application of Easy Drive GT200 Inverter in Hoist System

Application of Easy Drive GT200 Inverter in Hoist System

Application of Easy Drive GT200 Inverter in Hoist System

Six, summary

The wide application of AC variable frequency speed regulation technology in the industry provides a brand-new scheme for AC asynchronous motor drive and speed regulation. It has high-performance speed regulation indicators. It can use a squirrel cage asynchronous motor with simple structure, reliable work, and convenient maintenance. The traditional AC speed regulation system has been greatly improved. Therefore, the use of AC frequency conversion speed regulation is the mainstream of the development of crane AC speed regulation technology.

The Links:   SKKH330-16E A2475

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