MD380 User Manual Desc
ription of Function Codes
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• FA-05 (Proportional gain Kp1)
It decides the regulating intensity of the PID regulator. The higher the Kp1 is, the larger
the regulating intensity is. The value 100.0 indicates when the deviation between PID
feedback and PID setting is 100.0%, the adjustment amplitude of the PID regulator on
the output frequency reference is the maximum frequency.
• FA-06 (Integral time Ti1)
It decides the integral regulating intensity. The shorter the integral time is, the larger
the regulating intensity is. When the deviation between PID feedback and PID setting
is 100.0%, the integral regulator performs continuous adjustment for the time set in FA-
06. Then the adjustment amplitude reaches the maximum frequency.
• FA-07 (Differential time Td1)
It decides the regulating intensity of the PID regulator on the deviation change. The
longer the differential time is, the larger the regulating intensity is. Differential time is the
time within which the feedback value change reaches 100.0%, and then the adjustment
amplitude reaches the maximum frequency.
Function Code Parameter Name Setting Range Default
FA-08
Cut-off frequency of PID reverse
rotation
0.00 to maximum frequency 2.00 Hz
In some situations, only when the PID output frequency is a negative value (AC drive
reverse rotation), PID setting and PID feedback can be equal. However, too high reverse
rotation frequency is prohibited in some applications, and FA-08 is used to determine the
reverse rotation frequency upper limit.
Function Code Parameter Name Setting Range Default
FA-09 PID deviation limit 0.0%–100.0% 0.0%
If the deviation between PID feedback and PID setting is smaller than the value of FA-09,
PID control stops. The small deviation between PID feedback and PID setting will make the
output frequency stabilize, effective for some closed-loop control applications.
Function Code Parameter Name Setting Range Default
FA-10 PID differential limit 0.00%–100.00% 0.10%
It is used to set the PID differential output range. In PID control, the differential operation
may easily cause system oscillation. Thus, the PID differential regulation is restricted to a
small range.
Function Code Parameter Name Setting Range Default
FA-11 PID setting change time 0.00–650.00s 0.00s
The PID setting change time indicates the time required for PID setting changing from 0.0%
to 100.0%. The PID setting changes linearly according to the change time, reducing the
impact caused by sudden setting change on the system.
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