Mechanical Loss Compensation (Pr. 739 To Pr. 749, Pr. 762) - Mitsubishi Electric FR-A700-A1 Instruction Manual

Details of the tension control
4.6.4

Mechanical loss compensation (Pr. 739 to Pr. 749, Pr. 762)

Parameter
Number
739 Mechanical loss setting frequency bias
740 Mechanical loss setting frequency 1
741 Mechanical loss 1
742 Mechanical loss setting frequency 2
743 Mechanical loss 2
744 Mechanical loss setting frequency 3
745 Mechanical loss 3
746 Mechanical loss setting frequency 4
747 Mechanical loss 4
748 Mechanical loss setting frequency 5
749 Mechanical loss 5
762 Winding/unwinding selection
(1) Control block diagram
Pr. 749 L5
Pr. 747 L4
Pr. 745 L3
Speed
Pr. 743 L2
Pr. 741 L1
Pr. 739 LB
(2) Operation/setting procedure
 The maximum of five approximate break points can be set as mechanical loss points. Use Pr. 739 to Pr. 749 .
 The setting values of Pr. 739, Pr. 741, Pr. 743, Pr. 745, Pr. 747, Pr. 749 minus 500 are the mechanical loss setting values. The
values can be set in the range of ±100%.
Mechanical Loss
Parameter Setting
-100% to -1%
0%
1% to 100%
 The mechanical loss compensation amount is calculated from the lines connecting neighboring points of Pr. 739 to Pr. 749.
 The linearly interpolated mechanical loss compensated value is clamped in the range of ±100%.
 When Pr. 739 0 and Pr. 740 to Pr. 749 = "9999", the Pr. 739 setting value is used as the bias.
 Operate with a load (with a bobbin inside), and set the motor operation frequency and the monitored torque value in
Pr. 74  and Pr. 74  +1.
 The mechanical loss amount is considered according to the settings of the winding and unwinding shafts.
Unwinding shaft: tension command = torque command - mechanical loss compensation
Winding shaft: tension command = torque command + mechanical loss compensation
 For the compensation, Pr. 740, Pr. 741 to Pr. 748, and Pr. 749 settings are automatically sorted by their set frequencies in the
inverter.
 When the same frequency is set in Pr. 740 to Pr. 749, the setting in the smallest Pr. number takes precedence.
 When 0Hz is set in the mechanical loss setting frequencies 1 to 5, the Pr. 739 setting is ignored.
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Name
Mechanical loss
Pr. 740
Pr. 742 Pr. 744
N1
N2 N3
Setting
400 to 499%
500%
501 to 600%
Setting
Setting Range
Increments
400 to 600% 1%
0 to 400Hz, 9999 0.01Hz
400 to 600% 1%
0 to 400Hz, 9999 0.01Hz
400 to 600% 1%
0 to 400Hz, 9999 0.01Hz
400 to 600% 1%
0 to 400Hz, 9999 0.01Hz
400 to 600% 1%
0 to 400Hz, 9999 0.01Hz
400 to 600% 1%
0, 1 1
Pr. 762 = 0
Motor rotation
speed
Pr. 746 Pr. 748
N4 N5
Initial
Remarks
Value
500%
9999
500%
9999
No mechanical loss is set
500%
when "9999" is set as the
9999
frequency.
500%
Set at least two mechanical
9999
loss points.
500%
9999
500%
0
1 -1
Pr. 762 = 1
Mechanical loss
compensation