Power off and then power on. Set the sampling time to 5000. If adjusting the X-axis, set the data to 51 and check the actual speed. If the waveform is not smooth at startup, it indicates that the servo gain is insufficient and needs to be increased. If there are fluctuations in the straight line in the middle, it may be due to vibration caused by high gain. This can be changed by setting parameter 2066=-10 (increasing the servo current loop by 250um). N-pulse suppression: When adjusting, due to the increase in speed gain, a small range of oscillations (low frequency) also occurs when the machine tool stops. From the position error on the servo adjustment screen, it can be seen that the error varies around 0 when no command is given (when stopping). The single pulse suppression function can eliminate this oscillation. a) Parameter 2003#4=1. If the oscillation varies in the range of 0-1, set this parameter. The motor is elastically connected to the machine tool. The load inertia is larger than the motor inertia. When adjusting the load inertia ratio (greater than 512).
In addition to the existing E68 and M60S series models already available in the Chinese market, Mitsubishi Electric has further enhanced the M70/M700 models with these features. To achieve even higher precision 10-nanometer or higher true nanometer control, the M70/M700 incorporates and has developed fully nanometer-level instructions, nanometer interpolation of control paths, a high-speed fiber optic servo communication network (MACHnet), high-gain control type II servo control, a highly controllable HF motor , and a high-resolution 1 million or 16 million pulse encoder . Furthermore, to address the technical challenge of compensating for mechanical dynamic control precision, the M70/M700 models are equipped with SSS (SuperSmoothSurface) control, OMR-FF (Optimum Machine Response-FeedForward) control, and DDC (Direct Drive Communication) technologies.
The Huazhong CNC system's embedded PLC features a compact structure, sharing a CPU with the CNC machine. Its interface circuitry utilizes the CNC device itself and its I/O interfaces, eliminating the need for additional wiring or hardware. Information is displayed on the CNC monitor, facilitating PLC programming and enhancing fault diagnosis and system reliability. The CNC and PLC work in concert to control the CNC machine tool. The PLC primarily handles logic-related actions without specific trajectory requirements. It receives control codes from the CNC, such as M (auxiliary functions), S (spindle speed), and T (tool selection/change), decodes them, and converts them into corresponding control signals. These signals control the auxiliary devices to perform corresponding machine tool control and switching actions, such as workpiece clamping and tool changing. The PLC also receives instructions from the machine tool's control panel, directly controlling the machine tool's movements.
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