NOTE
Always set the desired for par.20-14 Maximum Reference/Feedb. before setting the values for the PID controller in
par. group 20-9*.
21-22 Ext. 1 Integral Time
Range: Function:
10000.0
0 s*
[0.01 - 10000.00 s] Over time, the integrator accumulates a contribution to the output from
the PID controller as long as there is a deviation between the reference/
setpoint and feedback signals. The contribution is proportional to the size
of the deviation. This ensures that the deviation (error) approaches zero.
Quick response on any deviation is obtained when the integral time is
set to a low value. Setting it too low, however, may cause the control to
become unstable.
The value set is the time needed for the integrator to add the same con-
tribution as the proportional part for a certain deviation.
If the value is set to 10,000, the controller will act as a pure proportional
controller with a P-band based on the value set in par.20-93
PID Propor-
tional Gain. When no deviation is present, the output from the propor-
tional controller will be 0.
21-23 Ext. 1 Differentation Time
Range: Function:
0.00 s* [0.00 - 10.00 s] The differentiator does not react to a constant error. It only provides a
gain when the feedback changes. The quicker the feedback changes, the
stronger the gain from the differentiator.
21-24 Ext. 1 Dif. Gain Limit
Range: Function:
5.0 N/A* [1.0 - 50.0 N/A] Set a limit for the differentiator gain (DG). The DG will increase if there
are fast changes. Limit the DG to obtain a pure differentiator gain at slow
changes and a constant differentiator gain where quick changes occur.
21-3* Closed-loop 2 Ref/Fb
Configure Extended Closed-loop 2 Controller reference and feedback.
21-30 Ext. 2 Ref./Feedback Unit
Option: Function:
See par.21-10
Ext. 1 Ref./Feedback Unit for details
[0]
[1] * %
[5] PPM
[10] min
[11] RPM
[12] PULSE/s
[20] liter / sec.
[21] liter / min
4-176 TR200 Programming Guide
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