EM15 User’s Manual
5. Description of Function Codes
81
proportional and differential operations take effect.
If integral separation is set to invalid, no matter whether the DI set with function 22"PID integral pause" is ON or not,
integral separation remains invalid.
⚫
Stop integral
After the output has reached to maximum or minimum limit in PID operation, we can select to stop the integral
operation or not. If we select to stop, it may help to reduce the PID overshoot.
C0-16
PID initial value
Default
0.0%
Setting Range
0.0%~100.0%
C0-17
PID initial value holding time
Default
0.00s
Setting Range
0.00s~650.00s
When the frequency inverter starts up, the PID output initial value (C0-16) , and sustain the holding time (C0-17),
the PID start close-loop calculation .
Diagram 5-27 PID initial value function
C0-18
Frequency upper limit of PID reverse rotation
Default
0.00 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%
