Drive control system

1. 1 main drive control system for bar line main drive motor selection of dc motor, 18 sukhoi tandem mill by 18 dc main motor drag, single action main motor drive system using Siemens 6 ra70 as the core part of adjustment, with imported production lines of high power thyristor as the success rate of core part, both through the solid grafting technology of motor speed control device, the device performance can be reached international advanced level, has the very high cost performance. 1) 6 ra70 control cabinet: Siemens 6 ra70 series of full digital dc speed regulating device performance is advanced, reliable, and is unanimously recognized at home and abroad. Ark to 1 6 ra7018 digital device as the core, the motor drive control. To participate in the network through CBP communication board on the Internet, real-time control and loop closed-loop adjustment, etc. Main transmission device of the given value have PLC, the host machine through PROFIBUS - DP network transmits to the 6 ra70 digital signals. Provided by the pulse coder detection, motor speed feedback directly to 6 ra70, as well as for digital signal. Such Numbers given (, PLC) + digital modulation ( 6RA70) + digital feedback ( The encoder)  Full digital dc speed control system of high performance and high quality. 2) Power cabinet: is composed of six high power thyristor rectifier system, have a fuse in the RC absorption and protection. A single rated current up to 1600 - a 2500 a, overload capacity of 2400 - a 3750 a minute, can completely meet the requirements of electrical demand and production. 3) Technical features: A. Has the very high technology this system adopts the feeder automation control system composed of computer network. In a single transmission automation solution, not only for the full automation adequate control environment and conditions, at the same time before the full automation implementation, can realize alignment between the rolling mill drive group, drab control, has the very high technology. B。 Has the very high mill speed regulating tank reliability with Siemens 6 ra70 digital dc speed regulating device, has the very high reliability. a) Interface capability: switch input, output, analog input and output functions; With functions of two kinds of speed feedback speed measuring machine and the encoder, and have separate Internet capability. b) Protection performance is strong: 6 ra70 itself has the fault label, check in the operation of the fault, fault classification clear, fault message, more convenient for troubleshooting. The reliability of the protection sensitivity, action is the best system. Main protection: over current, over voltage, tachycardia, excitation-loss, power and speed measuring machine wire, locked-rotor, motor overheating, overload power and etc. 4) Control system performance index is 1) Speed range: 1:2) System adjustment accuracy: 0. 3) 01% Static downhill: 0. 4) 2% Dynamic downhill: 1% 5) Recovery time: 200 ms1. Area 2 auxiliary drive control system of heating furnace, rolling area and finishing collection of ac drive auxiliary equipment adopts relay contactor control. For repeated short work load, using resistor startup, electric hydraulic brake; For continuously load, adopting the direct startup mode control. Control system adopts PLC control areas, increased across the advanced control system, the reliability, simplified the hardware circuit, convenient maintenance, realized the computer network. Hot roller, roller furnace charging and weighing roller, roller descaling, from roller, roller pinch roll, replacement and cooling bed entry table of ac speed regulating motor adopt schneider ATV68, 71 series digital ac frequency control of motor speed control device. Control device by DP communication board, connected to PROFIBUS - DP network, and the main and auxiliary transmission PLC communication, accept the control commands and signal feedback system. Set free by the upper machine roller speed.