Hoisting
SINCR C500 inverter in shaft hoistI. Overview hoistOur hoist equipment, commonly used TKD system, this control system is the use of relay logic control contacts to magnetic amplifier as the core component analog loop adjustment. In the relay control system, to complete a task control, govern the control system work "program" is done by the discrete components (relays, contactors, electronic components, etc.) connected with a wire to be implemented, such a control system is called wiring process control system. In the wiring process control system, change control procedures must be implemented by changing the wiring. For decades, this control system due to restrictions by the element level and flawed, the most prominent:(1) gear adjustment, speed is not continuous, the operation of mechanical vibration, shock tub big brake unsafe;Shock (2) starting and shifting current, starting current is generally 2-3 times the rated current, sometimes more, if rapid acceleration, and may even cause the master switch tripping;(3) the governor a lot of power consumption in the resistance, not only wasteful, but also caused poor working environment, a large spatial noise;(4) maintenance of large, inconvenient. Because AC contactor operating frequent operation, easily lead to contact and coil burned out, replace the rotor brushes frequently;(5) delay production. Mine is 24 consecutive hours of work, production capacity, heavy task, due to the electronic control system behind the design and manufacturing process backward, even for a short maintenance will bring to production losses.Second, the frequency control scheme2.1) mine hoist frequency control beforeFrequency of its energy efficiency and smooth speed, wide speed range and so on hoist has been widely used, mine hoist drive generally have the following requirements:1: Mine power fluctuations, the inverter can work in 380V ± 20%.2: smooth running, smooth acceleration and deceleration, speed curve acceleration section and deceleration section of S-type, the acceleration and deceleration during acceleration can be done continuously, no impact sensitivity.3: reserved energy approach: regenerative braking or dynamic braking.4: The inverter provides the required torque characteristics throughout the course of their work:Starting torque greater than 2 times the rated torque, especially when the mine car parked in the middle of the wellbore, starting torque is much greater than the rated torque. Torque at low frequency 3HZ greater than 1.6 times the rated torque.5: There is sufficient acceleration torque adaptation heavy vehicle acceleration boost.6: during operation due to rail irregularities or roller occasional strand rope will cause jump in motor torque, the inverter can withstand such a transition.7: running If there is an accident, the request can give greater than the rated torque braking torque when the fast stop, then there will be greater energy fed to the inverter.8: In the parking state, can give greater than the rated torque braking torque to prevent heavy vehicles decline.2.2) Frequency transformation programThe transformation of the hoist for the TKD single rope winding mine hoist, the original system is configured to 2m drum, a single hook, a mine shaft, depth 400m, lift-off weight of 10 tons, the motor is 380V / 200KW / 8 Ji wound rotor three-phase asynchronous motors, motor reducer than 20, the hydraulic braking station disc brake. Modification configured as SH-ZTK-BP Station, the inverter C500 280KW, brake units BR-DR-5HA 280KW (customer self-made), braking resistance 3Ω / 144KW.Mine hoist frequency control system consists of console, inverter system, hydraulic station, lubrication station, security, and control and monitoring system components, the system block diagram below. SINCR C500 inverter in shaft hoistI. Overview hoistOur hoist equipment, commonly used TKD system, this control system is the use of relay logic control contacts to magnetic amplifier as the core component analog loop adjustment. In the relay control system, to complete a task control, govern the control system work "program" is done by the discrete components (relays, contactors, electronic components, etc.) connected with a wire to be implemented, such a control system is called wiring process control system. In the wiring process control system, change control procedures must be implemented by changing the wiring. For decades, this control system due to restrictions by the element level and flawed, the most prominent:(1) gear adjustment, speed is not continuous, the operation of mechanical vibration, shock tub big brake unsafe;Shock (2) starting and shifting current, starting current is generally 2-3 times the rated current, sometimes more, if rapid acceleration, and may even cause the master switch tripping;(3) the governor a lot of power consumption in the resistance, not only wasteful, but also caused poor working environment, a large spatial noise;(4) maintenance of large, inconvenient. Because AC contactor operating frequent operation, easily lead to contact and coil burned out, replace the rotor brushes frequently;(5) delay production. Mine is 24 consecutive hours of work, production capacity, heavy task, due to the electronic control system behind the design and manufacturing process backward, even for a short maintenance will bring to production losses.Second, the frequency control scheme2.1) mine hoist frequency control beforeFrequency of its energy efficiency and smooth speed, wide speed range and so on hoist has been widely used, mine hoist drive generally have the following requirements:1: Mine power fluctuations, the inverter can work in 380V ± 20%.2: smooth running, smooth acceleration and deceleration, speed curve acceleration section and deceleration section of S-type, the acceleration and deceleration during acceleration can be done continuously, no impact sensitivity.3: reserved energy approach: regenerative brakin...