PID parameter group 08
PARAMETER DESCRIPTION 140
Example: 08-10(P.178)=5%, 08-11(P.179)=1.0s, 08-12(P.180)=90%, 08-13(P.181)=40Hz, 08 -15(P.183)=0.5Hz.
When the feedback value is greater than 95% of the target feedback value and less than 105% of the target
feedback value, it is in stable zone. In the stable zone, inverter reduces the output frequency based on 0.5 Hz per
second. When the inverter output frequency is lower than 40 Hz, inverter will directly decelerate to stop. When the
feedback value is lower than 90% of the target feedback value, inverter will wake up and the output frequency will
be controlled by PID again.
Target
feedback value
Wake up level
unmet
08-11
(P.179)
08-11
(P.179)
Actual
feedback
Output
frequency
Stop
level
0Hz
Awake
process
Stop
process
Slow down gradually (Every 08-
11(P.179) setting time, output
frequency lower 0.5Hz)
Time
Time
Simple setting of PID gain:
1. When the PID target value is changed, if the output response is slow, increase the proportional gain;
If the output response is fast but unstable, reduce the proportional gain (KP=08-04(P.172)).
When K
P
is too small When K
P
is too large
When K
P
is appropriate
Target value/
feedback value
Target value/
feedback value
Target value/
feedback value
TimeTimeTime
2. When PID target and feedback are not equal, reduce the integration time;
When target and feedback are equal after oscillation, increase the integration time (KI=08-05 (P.173)).
When K
I
is appropriate
When K
I
is too short
When K
I
is too long
Target value/
feedback value
Target value/
feedback value
Target value/
feedback value
TimeTimeTime
After increasing the proportional gain, if the output response is still slow, increase the differential gain;
If the output is unstable, reduce the differential gain (KD=08-06(P.174)).
Note: 1. When 08-09(P.177)=2, there is no alarm display on the keypad, multi-function digital output terminal output a
signal. After the inverter stops, the digital output terminal is automatically off.
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