User Manual of A90 Series Inverter interference on the feedback, but will cause the decline of the response performance of the F09.22 is used to filter the PID feedback. This is helpful to reduce the impact of process closed-loop system. F09.23 is used to filter the PID output. This is helpful to reduce the sudden changes in the output frequency of the inverter, but will also cause the decline of the response performance of the process closed-loop system. The function of PID feedback disconnection detection is to prevent galloping caused by feedback disconnection. Depending on the nature of the feedback sensor, the settings are different.
feedback disconnection detection (F09.25) needs to be set to an appropriate value. If the If the 0.0% type sensor is fed back at the time of disconnection, the lower limit of PID feedback amount is below the F09.25 setting and has been maintained for the PID feedback disconnection detection time (F09.26), the PID feedback will be regarded disconnected. When the 100.0% type sensor is fed back at the time of disconnection, the upper limit of PID feedback disconnection detection (F09.24) needs to be set to an appropriate value. If the feedback amount is greater than the feedback amount and has been maintained for the time corresponding to F09.26, the PID feedback will be regarded disconnected.
★ Once the feedback sensor is determined, only the corresponding detection mode can be applied. The upper limit detection and lower limit detection cannot be enabled at the same time.
206 Default Function code Function code name Parameter description Unit Attribute setting F09.22 PID feedback filtering time 0.000-30.000 s 0.000 ● F09.23 PID output filtering time 0.000-30.000 s 0.000 ● Function Default Function code name Parameter description Unit Attribute code setting F09.24 Upper limit detection value of PID feedback disconnection 0.00-100.00; 100.00 = invalid feedback disconnection % 100.00 ● F09.25 Lower limit detection value of PID feedback disconnection 0.00-100.00; 0.00 = invalid feedback disconnection % 0.00 ● F09.26 Detection time of PID feedback disconnection 0.000-30.000 s 0.000 ●