User Manual of EM760 High-Performance Inverter The PID setting change time refers to the time required for the setting to change from 0.0% to 100.0%, similar to the acceleration and deceleration time function. When the PID setting changes, the actual PID setting will change linearly, thus reducing the impact ofsudden changes on the system. Smoothing is invalid during the initial setting. The setting will change from the current feedback value during the start. F09.22 is used to filter the PID feedback. This is helpful to reduce the impact of interference on the feedback, but will cause the decline of the response performance of the 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 ofPID feedback disconnection detection is to prevent galloping caused by feedback disconnection. Depending on the nature of the feedback sensor, the settings are different. If the 0.0% type sensor is fed back at the time of disconnection, the lower limit of PID feedback disconnection detection (F09.25) needs to be set to an appropriate value.
If the 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.
94 Function code Function codename Parameter description Unit Default setting Attribute F09.21 PID setting change time 0.000~30.000 s 0.000 ● Function code Function codename Parameter description Unit Default setting Attribute 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 code Function codename Parameter description Unit Default setting Attribute 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 ● Function code Function codename Parameter description Unit Default setting Attribute F09.27 PID sleep control options 0:
Invalid 1: sleep at zero speed 2: sleep at lower frequency limit 3: sleep with tube sealed 0 ● F09.28 Sleep action point 0.00-100.00 (100.00 corresponds to the PID setting feedback range) % 100.00 ●