In the parameter adjustment process, you need to pay attention to:
1. P00 parameter is to select the main frequency input setting source, set to analog signal 0-10V input (1);
2. The P01 parameter is the operation signal source setting, and is set to the external terminal signal control (2);
3. P03 highest operating frequency selection, corresponding to the output frequency of the inverter when the analog signal is 10V input. Since the speed is in the range of 0-3500rpm, after the mechanical reduction ratio is calculated, this parameter needs to be set to 184HZ;
4. P04 and P05 are set according to the motor nameplate, P04=50Hz, P05=380V;
5. P10 and P11 are acceleration time and deceleration time. According to customer requirements, P10=5S, P11=5S;
6. P105 is the choice of control mode, need to choose vector control, P105=1;
It is important to note that since the vector control needs to provide the motor parameters (impedance), the inverter provides the motor parameter auto-tuning function P103, select P103=2, and the inverter will run automatically through the panel running key. In the automatic operation process, in addition to calculating the motor parameters, it is also possible to detect the no-load current. These parameters are very important for the vector control to show high performance. This process lasts for more than ten seconds. Before performing the auto-tuning function, be sure to check if there is no connection on the motor side, including the deceleration belt.
Fourth, debugging results
It can be seen from the above table that in the frequency range of constant torque output (0-50Hz), the vector-controlled no-load current is almost half of the VF control, and the current is also smaller than the VF during load; and when the load is cut, the VF is controlled. There was a significant drop in speed at the beginning, and there was a large difference between the no-load speed and the load speed. Compared with vector control, although the initial speed of the spindle will decrease, the drop value is small, and the speed will rise quickly. The final difference between the no-load speed and the load speed is not obvious. After the above debugging, compared with the original VF control, the performance has been greatly improved, no matter from the no-load current, low-speed torque, or speed change, the effect is very obvious, fully able to meet the needs of CNC machine tools.
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