ATCS PLC application in machine tool control

ATCS PLC application in the machine tool control newmaker welcome to e hall hall 2 lathe showroom/CNC lathe numerical control lathe, ordinary lathe, vertical lathe, horizontal lathe, turning center,. 。 。 1 background phi 3500 vertical machine is a kind of requires high degree of automation of mechanical and electrical equipment, generally used in metallurgical industry, car manufacturing all kinds of large workpiece; It usually adopts relay logic control method, equipment failure rate is high, the electric control system of maintenance cycle is long. With the progress of technology, this kind of control system has shown more and more disadvantages. PLC controller machine in recent years, more and more widely used in industrial automatic control field, it's on the control performance, group machine cycle and the hardware cost and so on aspects of the comprehensive advantages, is incomparable to other industrial control products. If using PLC control technology, the modification of the system implementation has common technical and economic significance. 2 options for manual operation, the original equipment according to use the department's advice, the person to maintain equipment before modification on the retrofit scheme used interface of primitivism, such can effectively reduce the equipment using the wrong operation, not make equipment accident rate increased after technical reform. System of workbench hydraulic solenoid valve, variable unit rely on changing, transmission ratio, and by the mechanical transmission parts, achieve change table speed. Its variable speed operation is quite tedious, must let the host parking, choose good speed, micro to chew or gear to gear again, finally to restart. According to the load calculation and theoretical analysis, retain the main drag, with a FRN15G95 - 4 je voltage type general frequency converter, the workbench reversing control motor speed. FRN15G954JE voltage type general converter torque vector control, slip compensation, AVR self-tuning adaptive, load torque and a series of advanced function, without speed sensor of the open loop operation condition, the magnetic flux vector control and motor parameter automatic test, etc, the speed control performance to achieve even higher than traditional thyristor power supply of the double closed loop dc speed control system. About the original system and two head, longitudinal lateral movement, through the electromagnetic clutch is connected to the drive motor around. About drive motor is Y/delta transformation, thus there are two levels of work feed speed: I level 0. 29 - 45. 6 m/min, II level 0. 58 - 91. 2m/min。 Modification, still maintain the original way. 1 input and output points of PLC control system of the input signal including speed signal input, workbench, and tool rest each work station control and distribution on the machine tool parts switch input signal and the frequency converter. A total of 64 input point. PLC controller control load is mainly divided into three categories: one is ten of the ac motor and reversing main contactor; 2 it is used in the tool post speed clutch coil around ( Electromagnetic clutch directly driven by PLC) ； Three is to display, alarm, a load, Including the display lamp, sound and light alarm, etc. ) ； Four is the workbench speed output ( To the frequency converter) 。 A total of 56 dots. 2 PLC selection after determining the input and output, but also for type selection of PLC, this system besides and inverter connected to the analog quantity, all for the switch, and then considering the performance price ratio and input/output points, selection of ATCS PPC31 type machine series, the wesson company PPC31 as modular structure, flexible system configuration, programming function is strong, high cost performance. 1 the inverter design all action have a PLC control system. When the PLC controller output relay out1 = ON bench forward; The relay output out2 = ON workbench reversed. The workbench with a total of 16 level speed. Operation, the first will be binary values stored in the PLC data area, when positive &negative, work station input speed value, and the PLC output binary values, all the way through D/A conversion to the 12 input terminal of the frequency converter, satisfies the requirement of table speed. When the out1 and out3 = O N, workbench inching forward; The workbench when out2 and out 3 = ON dynamic inversion. Move speed by frequency converter to provide instruction selection of multistage speed. When the motor overload lacks, thermal relay FR action, make the inverter THR terminal OFF, can U block in a flash. V。 W output, closed a fault relay 30 - at the same time 30 c contact, the PLC input relay system fault alarm. A but in the process of rapid braking, motor feedback 'pump up' voltage to frequency converter bus voltage 800 v, brake single-acting BU power module conduction, immediately access the resistance R rapid release of electrical energy storage, rapid braking safety. 2 software design of PLC through the programming input program and control purposes. Due to the working process of the PLC is circular, program execution speed, when the tool post feed two-speed motor, needs through the Y/delta transform for variable speed, so in order to avoid short circuit for power supply in Y/delta transformation, besides with interlock, also must set switch delay for 1 s. Similarly, in beams ( Reverse) Will still be recovered, Forward) , so also need to set switch delay, in case of power supply circuit. 5 conclusion practice has proved that transform traditional relay control system with PLC is a good method. It can give full play to the characteristics of PLC, high reliability, high anti-interference, long service life, less maintenance, search a simple external circuit. Adopt inverter at the same time to improve the performance of speed adjustment, the original system workbench starts running is beneficial to energy saving, The original system of mechanical variable speed, low speed motor power loss when big) , improves efficiency and create good economic benefits for the enterprise.
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