Application of Delta VE series inverter in rigid tapping

introduction:

One of the most common tapping methods used on CNC machine tools today is "rigid tapping" or "synchronous feed tapping". The rigid tapping cycle synchronizes the spindle rotation with the feed to match the specific thread pitch requirements. If the spindle rotation and the Z-axis feed are always controlled synchronously, the tapping accuracy can be guaranteed. This method is called "rigid tapping". At this time, the spindle operation changes from a speed system to a position system. Therefore, according to the definition of rigid tapping, we can get: to achieve the function of rigid tapping, the spindle drive system must have the function of position control, and the CNC system controls the Z-axis feed and the position of the spindle.

1. Introduction of Delta VE series inverter

The VE series inverters are developed by Delta to meet the application requirements of CNC machining centers, and their corresponding functions make them very suitable for application in CNC machining centers.

1. The high-speed version of the inverter can achieve stable operation at 3600HZ.

2. Rapid single-point positioning and multi-point positioning can be achieved through external I/O points, and there are special parameters to adjust the positioning characteristic curve and positioning time, which is easy to implement.

3. Rapid acceleration and deceleration can be achieved through special parameter adjustment, meeting the requirements of rapid response.

4. The new PDFF control makes gain adjustment simpler, more convenient and easier to master.

5. Analog and pulse position signals can be introduced to realize the position following function.

6. Automatic adjustment of low-speed and high-speed bandwidths to make the gains of the speed loop and position loop more suitable for the needs of on-site loads.

The constant tension control function of the VE series inverter has great development potential in the printing and wire drawing industries. It can achieve:

1. Tension control scheme of tension closed loop speed mode

2、张力闭环轉鉅模式的张力控制方案

张力开环轉鉅模式的张力控制方案

2. Hardware block diagram of Delta VE inverter to achieve rigid tapping

The system wiring diagram of pulse command following is as follows

The resolution of Delta VE series analog quantity has reached 12BIT. The analog quantity input wiring diagram is as follows:

3. Debugging steps of VE inverter

Step 1: V/F test run

Step 2: Motor parameter determination

Step 3: Vector Control

After auto-tuning is complete, check the relevant parameters.

【05-05】àNo-load Current (approximately 30%-50% of rated current)

【05-06】at Rs

【05-07】No

【05-08】Alm

【05-09】àLx

Step 4: Execute the inertia estimation function

Step 5: Set relevant inverter parameters according to system requirements.

4. Monitoring software supporting VE

The VE series inverters not only have excellent performance, but also provide a variety of on-site data acquisition and waveform acquisition methods. They can directly present relevant operating data to customers without an oscilloscope, making it easier for on-site commissioning personnel to debug and identify problems.

VFD-VE motor software is a monitoring software specially designed for VE, and it is also a very practical digital oscilloscope software. Through this software, we can see the relevant data very intuitively, so as to better judge the extraordinary performance of the VE series inverter. The figure below is the waveform at the scene. Through the waveform below, we can see very intuitively that the output frequency of the inverter always follows the set frequency of the corresponding CNC system. As the frequency changes, its current runs very smoothly.

VFD-VE inverter is a masterpiece representing the current advanced control technology, especially its super performance similar to servo drive, plus its absolute price advantage over servo drive in high power. Therefore, it is becoming more and more popular among people in the domestic machine tool industry. At the same time, with the rich field application experience and fast service system of Zhongda Electric, it will be the first choice product for all machine tool, printing and wire drawing industries.