Mitsubishi Electric A800 Plus Series Function Manual page 137

Tension sensorless torque control details
Mechanical loss compensation function selection (Pr.1230, Pr.1419 to
Pr.1429)
• The maximum of five approximate break points can be set as mechanical loss points. Set mechanical loss parameters
(mechanical loss setting frequency, mechanical loss) and linearly interpolate the values between the set points.
• The mechanical loss compensation value is calculated from the mechanical loss setting and the motor rotation speed
(output frequency) and added to the torque command value. The mechanical loss compensation amount is added as
follows according to the winding/unwinding setting.
Winding/unwinding
Winding shaft (Pr.1230 = "0")
Unwinding shaft (Pr.1230 = "1")
• For setting the mechanical loss (Pr.1419, Pr.1421, Pr.1423, Pr.1425, Pr.1427, Pr.1429), regard 1000 as 0% and set an
offset from 1000.
Parameter setting
900.0 to 999.9%
1000.0%
1000.1 to 1100.0%
• Operate the line with a load (with a reel inside), and set the motor speed frequency and the monitored torque value in
Pr.1420 to Pr.1429.
NOTE
• When "9999" is set in the mechanical loss setting frequency, the corresponding mechanical loss setting is invalid.
• If the same frequency is set in two or more of the Pr.1420, Pr.1422, Pr.1424, Pr.1426, and Pr.1428 settings, the mechanical
loss set in the parameter with the smallest parameter number is valid.
• When the mechanical loss setting frequency (1 to 5) setting is 0 Hz, the Pr.1419 setting is invalid.
Mechanical loss compensation function setting example
• The mechanical loss compensation value after linear interpolation is limited within the range of ±100%.
100%
Pr.1423 L2
Pr.1421 L1
Pr.1419 LB
• The pairs of parameters (Pr.1420/Pr.1421), (Pr.1422/Pr.1423), (Pr.1424/Pr.1425), (Pr.1426/Pr.1427), and (Pr.1428/
Pr.1429) are arranged internally in the inverter from the pair with the smallest mechanical loss setting frequency to the one
with the largest.
Pr.1429 L5
Pr.1427 L4
Pr.1425 L3
Pr.1423 L2
Pr.1421 L1
Pr.1419 LB
136
TENSION SENSORLESS TORQUE CONTROL
Commanded torque after mechanical loss compensation
Torque command value minus mechanical loss compensation value
Torque command value plus mechanical loss compensation value
Actual mechanical loss setting
-100.0 to -0.1%
0.0%
0.1 to 100.0%
Mechanical loss compensation value
N1
N2
Pr.1420 Pr.1422
Mechanical loss setting frequency
Mechanical loss compensation value
N4 N2 N3
Pr.1426 Pr.1422 Pr.1424 Pr.1428
Mechanical loss setting frequency
Motor speed
Motor
Rotation speed
N5 N1
Pr.1420
Pr.1420 = 10 Hz Pr.1419 = 1000%
Pr.1422 = 20 Hz Pr.1421 = 1030%
Pr.1424 = 9999 Pr.1423 = 1080%
Pr.1426 = 9999 Pr.1425 = 1000%
Pr.1428 = 9999 Pr.1427 = 1000%
Pr.1429 = 1000%
Pr.1420 = 50 Hz Pr.1419 = 1000%
Pr.1422 = 20 Hz Pr.1421 = 1010%
Pr.1424 = 30 Hz Pr.1423 = 1030%
Pr.1426 = 10 Hz Pr.1425 = 1040%
Pr.1428 = 40 Hz Pr.1427 = 1070%
Pr.1429 = 1080%