Speed Control Proportional Gain Selection Based On Winding Diameter Compensation Result (Pr. 775 To Pr. 780) - Mitsubishi Electric FR-A700-A1 Instruction Manual

3.9.5 Speed control proportional gain selection based on winding diameter compensation result
(Pr. 775 to Pr. 780)
Speed control proportional gain at vector control and Real sensorless vector control can be changed based on a winding
diameter calculation result.
Parameter
Number
775 Speed control proportion term applied diameter 1
776 Speed control proportion term applied diameter 2
777 Speed control proportional gain 1
778 Speed control proportional gain 2
779 Speed control proportional gain 3
780 Speed control proportional gain 4
Speed control
Proportional (P) term
(Proportional gain 4)
(Proportional gain 3)
(Proportional gain 2)
(Proportional gain 1)
X1 = ((Maximum winding diameter - minimum winding diameter)
X2 = ((Maximum winding diameter - minimum winding diameter)
This function activates when two or more settings of Pr. 777 to Pr. 780 (speed control proportional gain 1 to 4) are set.
If two or more setting are not set, Pr. 820 Speed control P gain 1 is valid with RT signal OFF, Pr. 830 Speed control P gain 2 is
valid when RT signal ON.
Pr. 777 to Pr. 780 can be set disabled with the speed control proportional gain disabled signal (X93).
Winding diameter calculation
Disable
Disable
Enable
Enable
A machine operates at 33% when Pr. 775 Speed control proportion term applied diameter 1 = "9999", at 66% when Pr. 776 Speed
control proportion term applied diameter 2 = "9999." When Pr. 775 = Pr. 776, bigger value between proportional gain 3 and
proportional gain 4 is valid. Below graph shows the value of speed control proportional gain when two settings are made.
Speed control
proportional (P) term
gain (%)
Pr. 780
(Proportional gain 4)
Pr. 779
(Proportional gain 3)
(Pr. 723, Pr. 725, Pr. 727)
Min. diameter
Name
Gain (%)
Pr. 780
Pr. 779
Pr. 778
Pr. 777
Pr. 721
(Pr. 723, Pr. 725, Pr. 727)
X1
Min. diameter
Empty
X93
OFF
ON
OFF
ON
X1
Pr. 721
Empty Medium
Setting Range
0 to 100%, 9999
0 to 100%, 9999
0 to 1000%, 9999
0 to 1000%, 9999
0 to 1000%, 9999
0 to 1000%, 9999
Winding diameter [mm]
Pr. 720
(Pr. 722, Pr. 724, Pr. 726)
X2
Max. diameter
Medium Whole
 Pr. 775/100) + minimum winding diameter
 Pr. 776/100) + minimum winding diameter
Speed control gain
Pr. 820/Pr. 830
Pr. 820/Pr. 830
Pr. 777 to Pr. 780
Pr. 820/Pr. 830
Winding diameter [mm]
X2
Pr. 720
(Pr. 722, Pr. 724, Pr. 726)
Max. diameter
Whole
Main speed setting
Increments Initial Value
1% 9999
1% 9999
1% 9999
1% 9999
1% 9999
1% 9999
47
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