Dancer feedback speed control details
89
3
Gain switchover according to the PID deviation (Pr.486 to Pr.494)
• The gain can be switched according to the amount of the deviation from the set point included in the measured value
(dancer feedback signal).
• Value G in the PID control formula can be changed according to the deviation of the PID control input.
• When "9999" is set in
Pr.490 to Pr.494
, the gain is 100%.
• To use the gain switchover function, set a value other than "9999" in both
Pr.488
and
Pr.489
. If "9999" is set in either or
both of the parameters, "9999" is applied to all gains (A to D).
• Set
Pr.486 to Pr.489
so that A>C1
≥
C2>B is true. Otherwise, a write error occurs. When C1 = C2, larger gain between gain
C1 and C2 becomes valid.
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
+100%
0%
-100%
Deviation input
Deviation C1
(Pr.488)
Deviation A
(Pr.486)
Deviation C2
(Pr.489)
Deviation B
(Pr.487)
Gain A
(Pr.490)
Gain B
(Pr.491)
Gain C1
(Pr.492)
Gain G
Gain C2
(Pr.493)
Gain D
(Pr.494)
Summary of Contents for A800 Plus Series
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