The NUM1050 is a high-performance, open CNC system that utilizes a 64-bit CPU to ensure fast processing and precise positioning control. It supports both basic RS232C serial communication and advanced FIPWAY network communication, making it highly versatile for different application needs. The system allows for easy parameter configuration, program loading, and tooling changes, enhancing overall operational efficiency.
The electrical control system of a three-axis gantry milling machine using the NUM1050 and NUMDRIVE is designed with precision and flexibility in mind. The machine features three linear axes—X, Y, and Z—with the X-axis capable of traveling up to 10.5 meters. All three axes are equipped with HEIDEHAIN linear encoders (1Vpp sine wave) for full closed-loop feedback, ensuring accurate position detection. The spindle is an electric motor, offering improved performance and energy efficiency.
To support advanced functions like DNC (Direct Numerical Control) and FMS (Flexible Manufacturing System), the system includes a FIPWAY network communication module. The three feed axes are driven by BPH motors (X: 36 N·m, 200 rpm; Y: 17 N·m, 200 rpm; Z: 17 N·m, 200 rpm), providing strong and reliable motion control. A Schneider Inverter is also integrated for additional power management.
The NUM1050 operator panel features 39 customizable keys, allowing users to quickly access frequently used functions. These keys are optically connected to the system, ensuring reliable operation. The system offers a wide range of I/O modules, including 32 input modules with LED indicators, supporting both standard 24VDC switches and three-wire proximity sensors. The 24-bit output relay module can handle up to 8A, making it ideal for controlling solenoids and contactors.
Additionally, the NUM1050 has analog input/output and external interrupt interfaces (IT/ANA), which provide flexible control options. This feature is particularly useful for connecting to the spindle inverter, enabling smooth speed control of the frequency-controlled electric spindle.
For software development, NUM provides powerful tools such as PLCTOOL, SETTOOL, MMITOOL, and PCKITTOOL, all running on the Windows platform. These tools make it easier for engineers to develop and fine-tune the control system. Position compensation software like INTERAXIS CALIBRATION helps improve accuracy, especially for gantry machines where the weight of the spindle can cause beam deformation during movement.
Using PLCTOOL, we were able to quickly develop the machine’s PLC logic. SETTOOL was used to configure and adjust parameters, including reference points, soft limits, and maximum feed rates. An interferometer was used to measure coordinate positioning errors, and the system’s “axes correction†software helped fine-tune these values.
The NUMDRIVE digital servo drive system supports various feedback mechanisms, such as TTL, 1Vpp, absolute encoders, and SSI/EnDat protocols. By adjusting servo parameters, the PUD position adjuster’s ratio and integration factor can be optimized. The system also includes a low-pass filter for special applications and can easily switch between half and full closed-loop modes, which is invaluable during machine debugging.
When working with the 1Vpp linear encoder, no signal conversion unit (EXEC) is required. Simply setting parameter V0350 ensures compatibility between the system and the encoder. During Z-axis calibration, current levels were monitored via SETTOOL, and parameters V051 and V052 were adjusted to stabilize and improve Z-axis performance.
The system continuously monitors the quality of the encoder signal and triggers alarms when issues arise. Using the built-in oscilloscope in SETTOOL, we analyzed feed speed and current waveforms to evaluate the system’s positioning accuracy. Proportional and integral gains for each axis were carefully adjusted to achieve optimal performance.
Long-length scale calibration was done using a laser to measure full-scale coordinate errors. SETTOOL was used to monitor idle currents across all three axes, and system and mechanical parameters were fine-tuned to minimize them. For X-axis travel over 10 meters, position error compensation was achieved through the servo system’s internal adjustments, meeting the machine’s acceptance accuracy requirements.
In summary, the NUMDRIVE digital servo drive system provides a highly efficient and user-friendly way to adjust both static and dynamic positioning accuracy, making it a key component in achieving high-precision machining.
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