Dancer feedback speed control details
84
3.5.11
PID control gain setting
Set the proportional band, integral time, and differential time for PID control.
Block diagram
PID control proportional band (Pr.129)
• If a narrow proportional band is set (small parameter setting value), the manipulated amount changes considerably by
slight changes in the dancer signal.
PID control integral time (Pr.130)
• Ti is the time required for integral (I) action alone to provide the same manipulated amount as is the case with proportional
(P) action.
• The set point is reached earlier when the integral time setting is shorter.
PID control differential time (Pr.134)
• Set the differential time for differential (D) action. Td is the time required to provide the same manipulated amount as is the
case with proportional (P) action. Response to changes in deviation increase greatly as the differential time increases.
Pr.
Name
Initial value
Setting
range
Description
129
R110
(A613)
PID proportional band
100%
0.1 to 1000%
If a narrow proportional band is set (small parameter setting value),
the manipulated amount changes considerably by slight changes in
the measured value. As a result, response improves as the
proportional band becomes narrower, though stability worsens as
shown by the occurrence of hunting. Gain Kp=1/proportional band
9999
Without proportional band
130
R111
(A614)
PID integral time
1 s
0.1 to 3600 s
With deviation step input, this is the time (Ti) used for obtaining the
same manipulated amount as proportional band (P) by only integral
(I) action. Arrival to the set point becomes quicker the shorter an
integral time is set, though hunting is more likely to occur.
9999
Without integral control
134
R112
(A615)
PID differential time
9999
0.01 to 10 s
With deviation ramp input, this is the time (Td) used for obtaining the
manipulated amount only by proportional action (P). Response to
changes in deviation increase greatly as the differential time
increases.
9999
Without differential control
PID control formula:
G
·
Kp (1 +
1
+ Td
·
S)
Ti
·
S
Gain Kp = 1/proportional band
Ti = Integral time
Td = Differential time
Gain G = PID gain selection function: Refer to
.
PID control
gain selection
Tension PI gain
tuning result
Gain G switching
Pr.486 to Pr.494
Pr.486 to Pr.494
Pr.486 to Pr.494
Pr.135, Pr.136
Gain G switching
Clamping
Deviation
Gain G switching
Clamping
Manipulated amount
Held
Pr.485
Integral action
selection
Tension PI gain
tuning not performed
Tension PI gain
tuning performed
Tension PI gain
tuning not performed
Tension PI gain tuning performed
X100-OFF
X100-ON
X103-OFF
+
+
+
X103-ON
Tds
1
Tis
Kp
100%
-100%
0
0
Kp
Kp
∫
Summary of Contents for A800 Plus Series
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