Shihlin electric SL3 Series, Руководство пользователя, Страница: 138 / 211

PID parameter group 08
PARAMETER DESCRIPTION 134

If 08-10 (P.178) is set to 0, then 08-11 (P.179), 08-12 (P.180), 08-13 (P.181), 08-15 (P.183) value is invalid. If the
value of 08-10 (P.178) is not 0, the PID sleep function will be enabled. When the absolute value of the deviation
between the feedback value and the target feedback value is less than the sleep detection deviation and lasts for
08-11 (P.179) sleep detection time, the inverter will gradually reduce the output frequency, when the inverter
output frequency is lower than 08-13 (P.181) stop level, inverter will decelerate to stop. When the feedback value
is lower than the wake-up level, the inverter output frequency is controlled by PID again.
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
Time Time Time
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
Time Time Time