Lenze 8400 TopLine - Manual (Page 1636)

19 Function library
19.1 Function blocks
1636
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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19.1.149.1 Control characteristic
The dancer position or tension controller can be optionally operated as P, PI or PID controller. In the
Lenze setting, the PI algorithm is active.
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 in
C01056/1 .
• The controller gain can be adapted via the nVpAdapt_a input (also possible in online mode).
• The nVpAdapt_a input value has a direct effect on the controller gain:
Example: With the parameterised controller gain Vp = 2.0 and nVpAdapt_a = 75 %, the resulting
gain factor is as follows:
Reset time Tn (I component)
The adjustment time Tn is set under
C01053/4 .
• The I component of the controller can be deactivated by setting the input bIOff to TRUE.
• The I component can be switched on and off online.
Differential component Kd (D component)
The differential component Kd is set under
C01053/5 .
• 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.
Evaluation of the output signal (controller influence)
If the motor speed or motor torque is precontrolled, a low influence is sufficient for the controller to
comply with the setpoint.
Use the nInfluence_a input to select the influencing factor the controller correcting variable
(nOut_a) is to be evaluated with. The evaluated controller correcting variable is output at
nOutRed_a.
Switching on/off the controller
By setting the bReset input to TRUE, the process controller can be switched off.

Note!
The controller influence evaluates the output signal multiplicatively. A change of the
nInfluence_a influencing factor also changes the dynamics of the controller!
P nVpAdapt_a C01056/1 ⋅
=
P
75 [%]
100 [%]
-------------------
2.0 ⋅ 1.5
= =