5.Description of Function Codes
EM12 User's Manual
84
C0-18
Frequency upper limit of PID reverse rotation
Default
2.00 Hz
Setting Range
0.00 ~ maximum frequency
In some situations, only when the PID output frequency is a negative value (frequency inverter reverse rotation), PID
setting and PID feedback can be equal. However, too high reverse rotation frequency is prohibited in some
applications, and C0-18 is used to determine the reverse rotation frequency upper limit.
C0-19
PID deviation limit
Default
0.0%
Setting Range
0.0%~100.0%
If the deviation between PID feedback and PID setting is smaller than the value of C0-19, PID control stops. The
small deviation between PID feedback and PID setting will make the output frequency stabilize, which is effective
for some closed-loop control applications.
C0-20
PID differential limit
Default
0.10%
Setting Range
0.00%~100.00%
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.
C0-21
Maximum positive deviation between two PID outputs
Default
1.00%
Setting Range
0.00%~100.00%
C0-22
Maximum negative deviation between two PID outputs
Default
1.00%
Setting Range
0.00%~100.00%
This function is used to limit the deviation between two PID outputs (2 ms per PID output) to suppress the rapid
change of PID output and stabilize the running of the frequency inverter.
C0-21 and C0-22 respectively are corresponding to the maximum absolute value of the output deviation in
forward direction and in reverse direction.
C0-23
PID feedback filter time
Default
0.00s
Setting Range
0.00s~60.00s
C0-24
PID output filter time
Default
0.00s
Setting Range
0.00s~60.00s
C0-23 is used to filter the PID feedback, helping to reduce interference on the feedback butslowing the response of
the process closed-loop system.
C0-24 is used to filter the PID output frequency, helping to weaken sudden change of the frequency inverter output
frequency but slowing the response of the process closed-loop system.
C0-25
Detection value of PID feedback loss
Default
0.0%
Setting Range
0.0%: Not judging feedback loss 0.1%~100.0%
C0-26
Detection time of PID feedback loss
Default
0.0s
Setting Range
0.0s~20.0s
These parameters are used to judge whether PID feedback is lost.
If the PID feedback is smaller than the value of C0-25 and the lasting time exceeds the value of C0-26, the frequency
inverter reports Err31 and acts according to the selected fault protection action.
Summary of Contents for EM12 Series
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