INVT Goodrive300-01A Series, Руководство по эксплуатации

Страница: 90 / 175

Goodrive300-01A series VFD for air compressor Function code description
-85-
d. Empty system load, perform load-carrying joint debugging, and then fine-tune PID parameter until
fulfilling the requirement.
5.3.2 PID adjusting methods
After setting the parameters controlled by PID, you can adjust these parameters by the following
means.
Control overshoot: When overshoot occurred, shorten the derivative time (Td) and prolong integral
time (Ti).
Before adjustment
After adjustment
Response
Time t
Stabilize the feedback value as fast as possible: When overshoot occurred, shorten integral time
(Ti) and prolong derivative time (Td) to stabilize control as fast as possible.
Before adjustment
After adjustment
Response
Time t
Control long-term vibration: If the cycle of periodic vibration is longer than the set value of integral
time (Ti), it indicates the integral action is too strong, prolong the integral time (Ti) to control vibration.
Before adjustment
After adjustment
Time t
Response
Control short-term vibration: If the vibration cycle is short and almost the same with the set value of
derivative time (Td), it indicates derivative action is too strong, shorten the derivative time (Td) to