General VFD (Variable-frequency Drive) modification of this machine tool

The main components of the single-arm planer include bed, workbench, column, beam, workbench drive, feed box, lubrication system, hydraulic safety device and electrical equipment, etc. The transmission system of the workbench adopts the combined speed change of the first motor unit of the DC generator set and the second gear, which can complete the deceleration, reverse, slow-speed cut-in and other actions of the workbench, which belongs to the main drive system. The clamping and lifting of the beam and the movement and rotation of the tool rest belong to the auxiliary drag system. The automatic cycle control of the table movement adopts a combined proximity switch

2 Control requirements of single-arm planer

a. Stepless speed regulation and wide speed regulation range, the system runs smoothly;

b. The working speed can be adjusted freely according to different workpieces, and the speed of forward and backward can be adjusted separately;

c. Good starting and braking performance;

d. The system is simple, safe and reliable, easy to maintain, low noise, high efficiency and obvious energy saving.

3 Transformation of the main drag system of the workbench

3.1 Selection of motor, VFD (Variable-frequency Drive) and external accessories

The main drive system of the workbench adopts a Y225M-6 type, 37kW asynchronous motor, and the VFD (Variable-frequency Drive) adopts FRN45G11S-4CX VFD (Variable-frequency Drive) produced by Fuji Corporation of Japan. (Considering the working characteristics of the single-arm planer machine tool, the selected VFD (Variable-frequency Drive) is one level larger than the specification of the motor.) The main motor driven by the VFD (Variable-frequency Drive) will produce There is a lot of feedback energy, so deceleration braking and external braking resistor unit (VFD (Variable-frequency Drive) braking resistor is put into operation for the reversing braking of the planer during transformation, which can make this part of energy heat through the resistor way is consumed). To improve the braking ability of VFD (Variable-frequency Drive) during deceleration, so that the braking effect is better.

3.3 Adjustment of VFD (Variable-frequency Drive) function parameters

In order to make the VFD (Variable-frequency Drive) meet the requirements of load and operation mode, the main parameters of the VFD (Variable-frequency Drive) need to be set as follows.

3.3.1 Frequency setting

F01 is the frequency setting function, you can choose 0 keyboard panel key to adjust the machine parameters during debugging. 1 voltage input can be selected during work (terminal [12] 0-10V setting). The details can be set according to the running speed requirements.

3.3.2 Running operation

F02 is the running operation command, the selection is set to 1, and the running command is input from the external terminals [FWD] and [REV].

3.3.3 Acceleration and deceleration time

The acceleration time of F07 and the deceleration time of F08 are both set to 1.8s (depending on the actual use effect).

3.3.4 Torque boost

F09 torque boost, considering that the motor usually works at low speed, so F09 should be set to about 10, that is, the constant torque characteristic. However, it should be noted that when the torque boost increases, an overexcitation state will occur in the low speed range. When running continuously in this state, the motor may overheat, and the characteristics of the drive motor should be checked.

3.3.5 Frequency limitation

Considering the use of general-purpose motors, the upper limit frequency of F15 should be set to 50Hz.

3.3.6 Motor parameter setting

The number of poles of the P01 motor is set to 6 poles, the capacity of the P02 motor is set to 37kW, the rated current of the P03 motor is set to 71A, and P04 is set to select P04=2 for motor self-tuning (it is required to be separated from the load for tuning).

4 Conclusion

After using VFD (Variable-frequency Drive) to transform the main drive system of the B1012A single-arm planer workbench, the DC generator-motor unit, after operation, it fully meets the requirements of the production process, reduces energy consumption, improves production efficiency, and regulates The control is convenient and the maintenance amount is significantly reduced.