Application case analysis of FGI FD800 frequency inverter in long distance pipe and tape machine
FGI FD800 engineering drive series inverter is designed for high-end application market, with a perfect control system, the main control system uses high-speed DSP as the control core, has excellent speed and torque control performance, has a rich user interface and configuration, modular design scheme, support four-quadrant, support multi-machine transmission, flexible configuration of unit and cabinet. Can be used in the need of high overload capacity, high reliability, continuous operation occasions; Especially suitable for metallurgy, port machinery, lifting, shore power, petroleum, petrochemical, municipal, chemical, electric power, building materials, mining, shipbuilding, paper, dynamometer, EPS and other industries and all kinds of large equipment.
The FD800 series products adopt the international mainstream modular design concept, which can provide a single power unit, frequency converter unit, filter unit or a complete cabinet, so as to meet the needs of different types of end-users, Oems and system integration customers.
Due to its flexibility of configuration, the FD800 series products can also be customized according to the special needs of customers through a flexible combination of modules to meet the various precise control needs of customers.
Pipe and tape machine introduction
In order to solve the problem of dust pollution caused by the physical transmission process, a special type of belt conveyor that wraps loose materials in the forced formation of tubular tape for transportation is called a pipe conveyor as a material conveying equipment.
The conveying principle is exactly the same as that of the ordinary belt conveyor, that is, the conveying tape is used as the conveying media for transferring force and materials, the rotating silver bracket is used as the support of the conveying material tape, and the driving device drives the drum through the direction change and transmission of the drum, so that the conveyor belt relies on the friction between the drum and the tape to carry out circular rotation of the conveying material. The difference is that the ordinary belt conveyor material is transported on the tape forming a flat or trough section, while the tubular belt conveyor makes the material transported in the tape forming a tubular section.
The tubular belt conveyor system of the steel coking plant was put into production in 2009. With a total length of 3.6 kilometers, it connects the coking plant with the main factory, and is used for transporting coal from the raw coal dock in the main factory to the coke oven for coking production and use after unloading the ship, with a rated conveying capacity of 1200t/h.
Coal pipe conveyor adopts the first two tail one frequency conversion drive mode, motor power 880kW, equipped with an encoder for closed-loop control. Under normal circumstances, the control system uses a master and two slave frequency converter to drive the corresponding motor, and in the fault state of one device, the host can be switched to the slave machine to realize the control of one master and one slave.
The pipe and belt machine system has been put into operation for 15 years, there are problems of equipment aging, high failure rate, frequent daily maintenance, and the frequency converter spare parts in use have long been discontinued, such as sudden equipment failure production line production risk. In order to ensure the stable operation of the coal pipe conveyor system, FD800 series products are used to update, replace and optimize the function of the coal pipe conveyor system, so as to achieve stable and reliable production line equipment.
The FD800 engineering transmission frequency converter used in this system has the following characteristics:
(1) The 12-pulse rectifier scheme can effectively reduce harmonic interference and voltage fluctuations in the process of converting alternating current to direct current. The rectifier unit also has a built-in DC buffer.
(2) Excellent control performance. Provide V/F, open loop vector, closed loop vector three control modes, can drive synchronous and asynchronous motors, a control unit can be connected by optical fiber multiple transmission units, not only safe and reliable, cost saving, but also easy to achieve multi-transmission and parallel applications flexible switching.
(3) Modular power unit. Power unit modular design, improve product versatility; Improve product production efficiency, improve product maintenance, do not need repeated disassembly and installation, in the cabinet to achieve unit device maintenance work.
(4) The power unit is highly redundant, and the support unit is cut in. The inverter cabinet is composed of three 500kW power units. After a power unit fails, the unit can be removed, and the equipment can still ensure the normal operation of the machine and reduce the risk of sudden shutdown of the system.
(5) Instantaneous stop (low voltage crossing). When the main power supply of the user has a sudden voltage drop due to instantaneous power outage, flash power, power grid switching, etc., the inverter can ensure normal operation within a limited time.
(6) Fast car start. In the free rotation process of the motor, there is no need to wait for the remanence of the motor to disappear, there is no need to search the frequency down from the high frequency, the frequency converter starts from the current frequency of the motor, and drags the motor to run to the set state.
(7) Digital delay error compensation technology. The digital delay compensation algorithm is used to compensate the phase and amplitude delay caused by the period calculation, which can obviously improve the stability and control performance of the control loop.
(8) High reliability. The key devices adopt the long-life devices of international well-known brands, and the system reliability is fully guaranteed from the device level. The optical fiber communication technology is used between the system units to achieve photoelectric isolation, which can meet the special long-distance transmission requirements of the engineering site and effectively ensure the reliability of the system.
(9) Other technical features. Vibration suppression technology, automatic output voltage regulation technology, automatic current limiting function, etc.
Summarize
The successful operation of FGI FD800 series engineering drive frequency converter in steel mill pipe coal conveyor marks another breakthrough application of FGI frequency converter in steel industry. The project seamlessly replaces the original imported equipment of the pipe coal conveyor, and realizes the upgrade of the communication system from the ControlNet protocol to the Ethernet/IP protocol, and realizes the long-distance transmission of a single coal conveyor of 3.6km, breaking the new length of the industry. Three sets of FD800 engineering transmission and control system online switching host design, to ensure the continuity of equipment operation, greatly improve the efficiency of iron and steel enterprises. It marks the development of new quality productivity of FGI and the promotion of high-end equipment localization process to a new level.
