MD380 User Manual Desc
ription of Function Codes
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Function Code Parameter Name Setting Range Default
F9-69
Detection value of too large
speed deviation
0.0%–50.0% (maximum
frequency)
20.0%
F9-70
Detection time of too large speed
deviation
0.0–60.0s 5.0s
This function is valid only when the AC drive runs in the CLVC mode.
If the AC drive detects the deviation between the actual motor rotational speed detected by
the AC drive and the set frequency is greater than the value of F9-69 and the lasting time
exceeds the value of F9-70, the AC drive reports Err42 and according to the selected fault
protection action.
If F9-70 (Detection time of too large speed deviation) is 0.0s, this function is disabled.
Group FA: Process Control PID Function
PID control is a general process control method. By performing proportional, integral and
differential operations on the difference between the feedback signal and the target signal,
it adjusts the output frequency and constitutes a feedback system to stabilize the controlled
counter around the target value.
It is applied to process control such as flow control, pressure control and temperature
control. The following gure shows the principle block diagram of PID control.
Figure 6-27 Principle block diagram of PID control
1
Ti
1
S
+
+
Target
-
Td x S +1
1
P
Feedback
PID output
Function Code Parameter Name Setting Range Default
FA-00 PID setting source
0: FA-01
1: AI1
2: AI2
3: AI3
4: Pulse setting (DI5)
5: Communication setting
6: Multi-reference
0
FA-01 PID digital setting 0.0%–100.0% 50.0%
FA-00 is used to select the channel of target process PID setting. The PID setting is a
relative value and ranges from 0.0% to 100.0%. The PID feedback is also a relative value.
The purpose of PID control is to make the PID setting and PID feedback equal.
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