64
Details of the tension control
4.6.4
Mechanical loss compensation (Pr. 739 to Pr. 749, Pr. 762)
(1) Control block diagram
(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%.
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 c 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.
Parameter
Number
Name
Setting Range
Setting
Increments
Initial
Value
Remarks
739
Mechanical loss setting frequency bias
400 to 600%
1%
500%
740
Mechanical loss setting frequency 1
0 to 400Hz, 9999
0.01Hz
9999
No mechanical loss is set
when "9999" is set as the
frequency.
Set at least two mechanical
loss points.
741
Mechanical loss 1
400 to 600%
1%
500%
742
Mechanical loss setting frequency 2
0 to 400Hz, 9999
0.01Hz
9999
743
Mechanical loss 2
400 to 600%
1%
500%
744
Mechanical loss setting frequency 3
0 to 400Hz, 9999
0.01Hz
9999
745
Mechanical loss 3
400 to 600%
1%
500%
746
Mechanical loss setting frequency 4
0 to 400Hz, 9999
0.01Hz
9999
747
Mechanical loss 4
400 to 600%
1%
500%
748
Mechanical loss setting frequency 5
0 to 400Hz, 9999
0.01Hz
9999
749
Mechanical loss 5
400 to 600%
1%
500%
762
Winding/unwinding selection
0, 1
1
0
Parameter Setting
Mechanical Loss
Setting
-100% to -1%
400 to 499%
0%
500%
1% to 100%
501 to 600%
Pr. 740
N1
Pr. 742
N2
Pr. 744
N3
Pr. 746
N4
Pr. 748
N5
Pr. 741
L1
Pr. 743
L2
Pr. 745
L3
Pr. 747
L4
Pr. 749
L5
Mechanical loss
Motor rotation
speed
Speed
Mechanical loss
compensation
Pr. 739
LB
Pr. 762
= 1
Pr. 762
= 0
1
-1
