Mitsubishi Electric A800 Plus Series, Function Manual

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Dancer feedback speed control details
88
DANCER FEEDBACK SPEED CONTROL
 Block diagram
 PID gain setting for negative deviations (values below set point) (Pr.464
to Pr.466)
• The PID gain can be set individually when the measured value (dancer feedback signal) has a negative deviation from the
set point. When the setting is 9999, settings in Pr.129 , Pr.130 , and Pr.134 are applied regardless of the polarity of
deviation.

Switchover to the second to fourth PID gain (Pr.464 to Pr.484, X120
signal, X121 signal)
• Use the PID gain switchover (X120/X121) signal to switch the PID gain.
• To assign the X120 signal, set "120" in any of
Pr.178 to Pr.189 (input terminal function selection) . To assign the X121
signal, set "121" in any of Pr.178 to Pr.189 (input terminal function selection) .
∗1
As set in Pr.129 , Pr.130 , or Pr.134 respectively when "9999" is set.
∗2
When "9999" is set, the parameter setting for the first PID control gain (or the first PID control gain for values below set point) is applied. For
example, when
Pr.468 = "9999", the PID integral time is as set in Pr.130 , and the PID integral time for values below set point is as set in Pr.465 .
∗3
When "9999" is set, the PID control gain for positive deviations is applied. For example, when Pr.478 = "9999" and Pr.475
≠
"9999", the Pr.475
setting is applied to the both.
Item
Parameter for PID control gain
Positive deviation Negative deviation
PID proportional band Pr.129 Pr.464 ( Pr.129 when Pr.464 = "9999")
PID integral time Pr.130 Pr.465 ( Pr.130 when Pr.465 = "9999")
PID differential time Pr.134 Pr.466 ( Pr.134 when Pr.466 = "9999")
Signal
PID control gain
Parameter for PID control gain
X121 X120
PID proportional band / PID
integral time / PID differential time
PID proportional band / PID
integral time / PID differential time
(negative deviation)
OFF
OFF (First) PID control gain Pr.129 / Pr.130 / Pr.134 Pr.464 / Pr.465 / Pr.466
∗1
ON Second PID control gain Pr.467 / Pr.468 / Pr.469
∗2
Pr.470 / Pr.471 / Pr.472
∗3
ON
OFF Third PID control gain Pr.473 / Pr.474 / Pr.475
∗2
Pr.476 / Pr.477 / Pr.478
∗3
ON Fourth PID control gain Pr.479 / Pr.480 / Pr.481
∗2
Pr.482 / Pr.483 / Pr.484
∗3
X120-OFF X121-OFF
Tension PI gain tuning
not performed
Tension PI gain tuning
performed
Deviation < 0
Deviation 0
X121-OFF
X121-ON
X121-ON
X120-ON
X120-OFF
X120-ON
X120-OFF
X120-ON
X120-OFF
X120-ON
First PID control gain
Pr.129, Pr.130, Pr.134
Second PID control gain
Pr.467 to Pr.469
Third PID control gain
Pr.473 to Pr.475
Fourth PID control gain
Pr.479 to Pr.481
First PID control gain
Pr.464 to Pr.466
Second PID control gain
Pr.470 to Pr.472
Third PID control gain
Pr.476 to Pr.478
Fourth PID control gain
Pr.482 to Pr.484
Tension PI gain
tuning result
Pr.129 , Pr.130
PID control gain