User Manual of EM760 High-Performance Inverter In the vector control mode, the dynamic speed response of the inverter is adjusted by changing the speed proportional gain (ASR_P) and speed integral time (ASR_T) ofthe speed PI regulator. The increase in ASR_P or decrease in ASR_T may accelerate the dynamic response of the speed loop. If ASR_P is too large or ASR_T is too small, however, the system may be over-tuned to cause oscillation. Users should adjust the above speed PI parameters according to the actual load characteristics.
Generally, as long as the system does not oscillate, ASR_P should be increased as much as possible, and then ASR_T should be adjusted, so that the system makes response fast, without excessive over- tuning. To enable fast dynamic responses of the system at low and high speeds, PI regulation should be performed separately at low and high speeds. During the actual operation, the speed regulator will automatically calculate the current PI parameters based on the current frequency. The speed PI parameters are P1 and T1 at the switching frequency 1, and P2 and T2 at the switching frequency 2.
If the frequency is greater than the F06.04 switching frequency 1 and less than F06.05 switching frequency 2, the switching frequency 1 and switching frequency 2 will be subject to linear transition. As shown below. Fig. 7-3 Schematic Diagram of PI Parameters 1. The parameters F06.00 to F06.05 need to be adjusted carefully. They should not be adjusted under normal circumstances. 2. While setting the switching frequency, note that the F06.04 switching frequency 1 must be less than or equal to the F06.05 switching frequency 2. Speed loop output filtering can reduce the impact on the current loop, but the value ofF06.07 should not be too large. Otherwise, slow responses may be caused.
Use the default settings under normal circumstances. 206 Function code Function codename Parameter description Unit Default setting Attribute F06.07 Filtering time constant of speed loop output 0.000~0.100 s 0.001 ●