| The double-bucket hoist system used in the main shaft at Fank ou Mine is a thyristor DC driving system made by Symons Company.The location control loop used is a digital control technology.This digital control technology is based on the application of logic circuit module for collation,correction,operation,BCD code conversion of digital pulse produced from the digitalizer.Using digital output produced to monitor and control the location of hoisting system during running can give the hoist system much more safe and reliable running. |