Automatic Controller Design; In This Chapter You Can Read About; Dynamics Of A Control; Oscillating Plant - Parker Compax3 Series Operating Instructions Manual

Parker EME
4.3.3.3

Automatic controller design

In this chapter you can read about:
Dynamics of a control ...................................................................................................... 191
Cascade control............................................................................................................... 198
Stiffness ........................................................................................................................... 199
Automated controller design ............................................................................................ 201
Controller coefficients ...................................................................................................... 202

Dynamics of a control

In this chapter you can read about:

Structure of a control ....................................................................................................... 191
Oscillating plant ............................................................................................................... 191
stability, attenuation ......................................................................................................... 192
Velocity, bandwidth.......................................................................................................... 193
Setpoint and disturbance behavior of a control loop........................................................ 195
response .......................................................................................................................... 197
Limitation behavior........................................................................................................... 198
A change in the input value of a dynamic transmission element causes a change of
its output value. The change of the output value is however not immediately effecti-
ve, but takes a certain time, the transient response. The course of the transient
response is characteristic for certain kinds of transmission behavior.
For this reason, a complete description of the transmission properties of a control
comprises the stationary behavior (all setpoint, actual and disturbance values in
settled state), as well as the dynamic behavior.
Structure of a control
W
Controller
Regler
-
X
Regler / Control
Parameter
The basic task of a control is the generation and maintaining of a desired state or
sequence in spite of interfering disturbances. It is essential that the effects of the
disturbances are balanced with the correct force and at the correct time. In the
above figure, the setpoint value W represents the desired state and the disturbance
value Z represents the interfering disturbance. The actual value X represents the
generated and maintained state.

Oscillating plant

Oscillating control paths are control paths that respond with attenuated or unatte-
nuated oscillation to an abrupt change in the setpoint value. Part of this class are
for instance:
Linear actuators with toothed belts, as a toothed belt represents an elasticity.
A mechanic shaft with an external mass moment of inertia, as the shaft repre-
sents an elasticity due to its torsional properties.
In general this kind of elasticity is due to a high ratio between J
shaft is normally not designed for this high external load and which may lead to a
considerable distorsion.
192-120114 N5 C3I22T11 June 2008
Z
Regelstrecke
-
Control Process
Setting up Compax3
X
/J , as the
Load Motor
191