TD350 Series VFD Basic operation instructions
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5.5.15.2 How to fine-tune PID
After setting the parameters controlled by PID, users can fine-tune these parameters by the following
means.
Control overmodulation: When overmodulation 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 overmodulation 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 is almost the same with the set value of
derivative time (Td), it indicates derivative action is too strong, shorten the derivative time (Td) to
control vibration. When derivative time (Td) is set to 0.00 (namely no derivative control), and there is
no way to control vibration, decrease the proportional gain.
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