TI120 Series Variable Frequency Drive
Detailed parameter introduction
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P K
p
e
(t)
I Ki
D K
d
Output
de
(t)
dt
∫
t
0
e
(t)
dt
∑
∑
－
＋
＋
＋
Error
Target
Feedback
Figure 5-20 PID Control Principle Diagram
Proportional control Kp: once the deviation between the feedback quantity and the target
quantity occurs, the proportional gain Kp will act immediately, so that the feedback quantity
changes in the direction of reducing the deviation. The larger Kp, the faster the system
response, but too large Kp may cause system oscillation.
Integral control Ti: it is mainly used for eliminating the static deviation. The integral control
depends on the length of the integral time; the longer the integral time, the weaker the integral
action and the slower the system response; the shorter the integral time, the stronger the
integral action and the faster the system response.
Differential control Td: it is mainly used for reflecting the change rate of deviation. A correction
amount is introduced before the deviation signal changes, so the response speed of the system
is quickened; the longer the differential time, the stronger the effect, and the shorter the
differential time, the weaker the effect.
P40.00
PID given mode selection
range:0~8
Factory default:0
0: given by P40.01
1: analog input AI1
2: analog input AI2
3: reserve
4: Min[AI1,AI2]
5: Max[AI1,AI2]
6: Sub[AI1,AI2]
7: Add[AI1,AI2]
8: pulse given HDI
A given method for selecting the target quantity of PID
P40.01
PID digital given
range:0.0%~100.0%
Factory
default:50.0%
When P40.00 is set to 0, the PID target quantity is set by P40.01.
P40.02
PID feedback mode selection
range:0~8
Factory default:1
0: constant zero feedback input
1: analog input AI1
2: analog input AI2
3: reserve
