Inovance MD500T75GB-INT - Process Control; The Wobble Function

6. Description of Parameters
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6
6.8 Process Control
This section introduces three commonly used process control functions, the wobble function, fixed
length and counting.
6.8.1 The Wobble Function
The wobble function is applicable to industries such as textile and chemical ber and winding
and unwinding applications. It indicates output frequency wobbles up and down with frequency
reference as center.
Figure 6-48 Application of the wobble function
The winding motor
rotates at uniform linear
speed.
Reciprocating
mechanism
Set wobble function related parameters.
With
wobble
function
Without
wobble
function
Pendulum
motor
f
t
Fb-01
Fb-02
Fb-03
Fb-04
Function Code
Parameter Name
Wobble amplitude
time coefficient
Triangular wave rising
Wobble cycle
Wobble step
The trace of running frequency at time axis is shown in the following gure.
Figure 6-49 The wobble function schematic diagram
Time (t)
Output
frequency (Hz)
Wobble frequency
upper limit
Frequency
reference Fset
Wobble frequency
lower limit
Wobble
cycle
Triangular
fallling time
Decelerate
Wobble amplitude
Aw = Fset x Fb-01
+Aw
Textile wobble
step
= Aw x Fb-02
-Aw
Triangular
rising time
RUN
command
Accelerate