Lenze 8400 - Manual (Page 1362)

18 Function library
18.1 Function blocks | L_PCTRL_1
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Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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18.1.133.1 Control characteristic
The PI algorithm is active in the Lenze setting.
Gain (P component)
The input value is controlled by a linear characteristic. The slope of the characteristic is determined
by the controller gain Vp.
The controller gain Vp is set under
C00222 .
• The controller gain can be adapted via the input nAdapt_a (also possible in online mode).
• The input value nAdapt_a has a direct effect on the controller gain:
Example: With the parameterised controller gain Vp = 2.0 and nAdapt_a = 75 %, the resulting gain
factor is as follows:
Integral action component (I component)
The I component can be selected via the input nISet_a. With a TRUE signal at bISet, the assigned
value is accepted in the PID controller.
• Setting the adjustment time Tn to the maximum value of "6000 ms" deactivates the I
component.
• The I component of the controller can also be deactivated by setting the input bIOff to TRUE.
• The I component can be switched on and off online.
Reset time
The adjustment time Tn is set under
C00223 .
Differential component Kd (D component)
The differential component Kd is set under
C00224 .
• The setting "0.0 s" deactivates the D component (Lenze setting). In this way, the PID controller
becomes a PI controller or P controller, if the I component has been deactivated as well.
P nAdapt_a C00222 ⋅ =
P
75 [%]
100 [%]
------------------- 2.0 ⋅ 1.5 = =