Setpoint And Disturbance Behavior Of A Control Loop - Parker Compax3 Series Operating Instructions Manual

Parker EME
Setting up Compax3
Frequency response of the P-TE component (value and phase)
1
= =
f , 0 0795 Hz
0 π
⋅
2 T
E
The cutt-off frequency is the fre-
quency where the input signal is attenuated by 3dB (-3dB attenuation). The phase
shift between the output and the input is -45° at this frequency.
Precisely this cut-off frequency is called the bandwidth of a control loop.

Setpoint and disturbance behavior of a control loop

In this chapter you can read about:
Demand behavior ............................................................................................................ 196
Disturbance behavior....................................................................................................... 196
Test functions .................................................................................................................. 196
Characteristics of a control loop setpoint response ......................................................... 197
The setpoint behavior is the behavior of the control loop for the setpoint variable W.
We assume that the disturbance variable Z=0.
The disturbance behavior describes the behavior of the control loop for disturbance
variable Z. In this case, we assume, in analogy to the setpoint behavior, that the
setpoint variableW=0.
195
192-120114 N5 C3I22T11 June 2008