YASKAWA SERVOPACK Sigma 7 Series, Product Manual, Page: 64 / 342

3.6 Setup Procedure
3.6.4 Settings for the System That Uses Pressure Feedback Control
3-14
The pressure for the rated torque is 11.5 N

m × 2 × π × 1,000 mm/20 mm
≈
3,612.8 N.
Therefore, the servo amplifier output at the rated torque would be 10 V × 3,612.8 N/980 N =
36.86.
And, Pn449 would be set to 36.86 V, or 3,686 [0.01 V/rated torque].
If the pressure feedback detection input is negative, set the Pressure Feedback Polarity Selec-
tion Switch to reverse the polarity (Pn440 = n.

1

).
FT41
For the FT41, set Pn467 to Pn46B (Pressure Feedback Sensor Gain) according to the output
from the sensor amplifier.
Set it so that the product of each feedback sensor gain (%) multiplied by the maximum output
value (0.01%) for each sensor amplifier is the 100% pressure feedback value.
Pressure feedback 100% value =
CH1 (pressure feedback value (0.01%) × pressure feedback sensor gain 1 (Pn467 (%)) + CH2
(pressure feedback value (0.01%) × pressure feedback sensor gain 2 (Pn468 (%)) + CH3 (pres-
sure feedback value (0.01%) × pressure feedback sensor gain 3 (Pn469 (%)) + CH4 (pressure
feedback value (0.01%) × pressure feedback sensor gain 4 (Pn46A(%)) + CH5 (pressure feed-
back value (0.01%) × pressure feedback sensor gain 5 (Pn46B (%))
Note: CH1 to CH5 are the pressure feedback values acquired with the respective other station monitor channels.
Setting Example
The conditions are as follows:
•
Servomotor: SGM7G-20 (Motor rated torque: 11.5 N·m)
•
Ball screw lead: 20 mm
•
Sensor amplifier output: For 0 to 980 N, 0% to 100.0% is output.
The pressure for the rated torque is 11.5 N·m × 2 × π × 1,000 mm/20 mm ≒ 3,612.8 N.
Therefore, the servo amplifier output at the rated torque would be 3612.8 N/980 N × 100.00%
= 368.65%.
When there is one pressure sensor, the settings are as follows:
1.
Set Pn467 so that the sensor amplifier output
×
Pn467/100% = 100% for the pressure
feedback detection value.
2.
Set Pn467 to 10,000/sensor amplifier output = 10,000/368.65 = 27%.
Parameter Meaning When Enabled Classification
Pn440
n.

0

(default setting)
Do not reverse the polarity.
After restart Setup
n.

1

Reverse the polarity.
Pn467
Pressure Feedback Sensor Gain 1
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1% 0 Immediately Setup
Pn468
Pressure Feedback Sensor Gain 2
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1% 0 Immediately Setup
Pn469
Pressure Feedback Sensor Gain 3
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1% 0 Immediately Setup
Pn46A
Pressure Feedback Sensor Gain 4
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1% 0 Immediately Setup
Pn46B
Pressure Feedback Sensor Gain 5
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1% 0 Immediately Setup
Torque
Torque
Torque
Torque
Torque