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Engraving machine interface circuit structure
by：Transon
2020-07-21
According to perform CNC engraving the electrical characteristics of mechanical and electrical machine and PC parallel port configuration, determine the input and output of the circuit, solve the pulse points, positive &negative, signal feedback, current set format, such as matching problem, completed the design of interface circuit, the interface circuit principle as shown in the interface circuit principle diagram.
the design of interface circuit according to the performance parameters of the stepper motor, selected the corresponding drive chip THB7128, peripheral circuit design, such as dial the
code switch set subdivided driving number, size and external current set end VERF voltage measuring resistance Rs size. Interface circuit and the output of the PC MACH3 port 25 pins parallel links up, including positive &negative, pulse input, and two stage circuit isolation, noise, etc.
module 1: parallel DB25 stitching connection.
interface board with PC parallel port interface DB25 needle pin connection diagram is divided into three signal input, output, and undefined pins. 2-25 needles 9 needles and 14 pin is the output signal, the pulse and direction of the motor and make the control pin, corresponding control motor speed, direction and enabled.
module 2: motor driver chip THB7128 and connection.
driver chip and motor winding connection, as well as drive chip driver parameter value set corresponding circuit, including the fine fraction, and drive current, chopping frequency, etc.
module 3: travel limit switches and abrupt stop button.
module 4: manual control module.
in the knife or workpiece trial cut, need the next bit machine through the button to try a knife or cutting, with convenient fuck
as a technical personnel, improve the efficiency. 555 pulse generator through an external shift, with adjustable frequency pulse, in cutting tool in three directions can obtain different feed speed. 5:
module power supply.
220 v ac DianZhuan into more stable direct current.
module 6: spindle dc motor PWM speed control. Add a
in the circuit of frequency and duty ratio is adjustable PWM control circuit, one can zoom in and fly-wheel circuit, make the spindle motor
speed adjustable within a certain range.
the design of interface circuit according to the performance parameters of the stepper motor, selected the corresponding drive chip THB7128, peripheral circuit design, such as dial the
code switch set subdivided driving number, size and external current set end VERF voltage measuring resistance Rs size. Interface circuit and the output of the PC MACH3 port 25 pins parallel links up, including positive &negative, pulse input, and two stage circuit isolation, noise, etc.
module 1: parallel DB25 stitching connection.
interface board with PC parallel port interface DB25 needle pin connection diagram is divided into three signal input, output, and undefined pins. 2-25 needles 9 needles and 14 pin is the output signal, the pulse and direction of the motor and make the control pin, corresponding control motor speed, direction and enabled.
module 2: motor driver chip THB7128 and connection.
driver chip and motor winding connection, as well as drive chip driver parameter value set corresponding circuit, including the fine fraction, and drive current, chopping frequency, etc.
module 3: travel limit switches and abrupt stop button.
module 4: manual control module.
in the knife or workpiece trial cut, need the next bit machine through the button to try a knife or cutting, with convenient fuck
as a technical personnel, improve the efficiency. 555 pulse generator through an external shift, with adjustable frequency pulse, in cutting tool in three directions can obtain different feed speed. 5:
module power supply.
220 v ac DianZhuan into more stable direct current.
module 6: spindle dc motor PWM speed control. Add a
in the circuit of frequency and duty ratio is adjustable PWM control circuit, one can zoom in and fly-wheel circuit, make the spindle motor
speed adjustable within a certain range.
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