Application of the hottest Dongneng servo in horiz

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The application of Dongneng servo in horizontal CNC machine tools

I. overview

numerical control (NC) is an automatic control technology developed in the 1950s. It is a method of using digital signals to control the movement and machining process of machine tools. Computer technology is introduced into numerical control technology, which is called CNC (compu numerical control). CNC has the characteristics of good flexibility, strong function, high reliability, good economy and easy to realize electromechanical integration, which has made a qualitative leap in numerical control technology

II. Process introduction

horizontal CNC machine tool is composed of CNC controller, servo drive, motor, electrical cabinet and frame of CNC machine tool. Its working principle is: by pairing more than 100 Dynesys devices in CNC and taking out the special programming software for detection after 5 and 7 years, the trajectory of the processed parts is expressed in the form of coordinates, and these information is converted into a signal with power (pulse train) that can drive the servo motor, and the servo motor is controlled to drive the corresponding axis to realize the motion trajectory. At the same time, the tool holder is equipped with numerical control turning tools. By configuring the corresponding tools according to the processing materials, the corresponding workpiece can be processed by cutting the processing materials fixed on the spindle

III. equipment composition

horizontal CNC machine tool is composed of CNC system, servo drive and motor, electrical cabinet and machine bed. CNC system: it mainly implements the program in its memory to realize the numerical control function, and is equipped with a special computer system with interface circuit and servo drive device. It converts the information calculated by the system itself into a signal with power (pulse train) driving the servo motor, controls each axis of the numerical control machine tool to generate the X, y, Z three axis tool path, and automatically processes the workpiece according to the given processing program. Therefore, CNC system is a digital control system including computer

IV. control line (cn2) wiring diagram and servo parameter setting

1) control line (cn2) wiring diagram

2) parameter setting Description:

pa4=0 (control mode selection, 0: position control)

pa9=16 (motor model selection, this parameter is different for different motors)

pa11=3500 (position loop gain, range 500-8000)

pa27=0/1 (pulse input logic is reversed, which can be used to change the motor direction)

pa31 (input command pulse frequency doubling molecule)

pa32 (input command pulse frequency doubling denominator)

note: electronic gear ratio =pa31/pa32==ppulse/p

where ppulse: the number of pulses per revolution of the motor, which refers to the number of pulses (pulses/revolution) fed back by the motor feedback element when the motor rotates for one revolution. For example, the number of pulses fed back to the driver of the 2500 line incremental encoder is 2500 × 4=10000;

p: refers to the number of upper computer command pulses (pulses/circle) that need to be received to make the motor rotate for one circle

v. debugging and precautions

1). Debugging steps:

a. correctly connect the motor power line (U, V, w), encoder line (CN3), power line (L1, L2, R, s, t), and control line (cn2)

b run the motor at low speed to see whether the motor direction is correct (the motor direction can be changed by adjusting ppa27 parameters)

c set the electronic gear ratio of servo driver (pa31/pa32) according to the requirements

d. after completing the above steps, run the motor to see whether the sound of the motor is normal, whether the rigidity of the motor is satisfied, and the response time; (it can be adjusted by: position loop parameters PA11, PA12, pa13; speed loop parameters PA14, pa15; current loop parameters pa38, pa41)

e. After adjustment, turn a sample to see whether it meets the requirements. If the sample is bad, repeat step d until the turned sample meets the requirements

2). Precautions:

a. when connecting power lines (U, V, w), be sure to connect them to u, V, w terminals one by one. The motor direction cannot be changed by changing the U, V, w phase sequence, but by adjusting parameters

b. When connecting the control wire (cn2), one end must be connected to the shielding wire. Avoid external interference to the control signal

c. the wiring must be reasonable, the AC and DC power supply must be strictly separated, the control line must be strictly separated from the motor power line, and the power line must be strictly separated

3). Results:

compared with the previous lathes of customers, the servo not only greatly improves the speed, but also solves the difficulties perplexing the domestic experimental machine industry in positioning accuracy; It is also much higher than before, and the sound of the motor is much lower than before, so as to maximize customer satisfaction

VI. faults and troubleshooting

1). Faults: as soon as the upper computer gave the signal, the motor flew away, and the driver gave an alarm No. 09

exclusion method; Check whether the phase sequence of the motor power line (U, V, w) is connected incorrectly, and check whether the driver PA9 (motor model selection) is set to "mazhanfeng" to indicate that it is set correctly

2). Fault: alarm No. 27 appears

Troubleshooting: check whether the motor encoder line (CN3) is loose. Try after fixing

3). Fault: the upper computer sends pulses, and the motor does not run

Troubleshooting: check whether the signal line in the control line (cn2) is wrong, check whether the servo driver pa64 is set correctly, the internal driver is enabled (pa64=64), and the upper computer is enabled (pa64=0)

VII. Summary

this CNC machine tool fully combines the fast response, accurate positioning, short setting time and stable operation of Dongneng servo eps2 series. So as to maximize the satisfaction of customers, not only improve the output and quality of customers, but also save labor costs for customers. This equipment fully demonstrates the technical ability of Zhejiang Dongneng Technology Co., Ltd. to customers, and greatly enhances the cost-effective competition of lathe manufacturers in the market

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