YASKAWA SGDV series User Manual page 199

5 Adjustments
5.5.2 One-parameter Tuning Procedure
Friction Compensation
This function compensates for changes in the following conditions.
• Changes in the viscous resistance of the lubricant, such as the grease, on the sliding parts of the machine
• Changes in the friction resistance resulting from variations in the machine assembly
• Changes in the friction resistance due to aging
Conditions to which friction compensation is applicable depend on the tuning mode. The friction compensa-
tion setting in F408.3 applies when the mode is 0 or 1. Tuning Mode = 2 and Tuning Mode = 3 are adjusted
with the friction compensation function regardless of the friction compensation setting in P408.3.
Friction
Compensation
Selecting
Pn408
Feedforward
If Pn140 is set to the factory setting and the tuning mode setting is changed to 2 or 3, the feedforward gain
(Pn109), speed feedforward input, and torque feedforward input will be disabled.
Set Pn140.3 to 1 if model following control is used together with the speed feedforward input and torque feed-
forward input from the host controller (through the command option module).
Pn140
For details on the speed feedforward input and the torque feedforward input, refer the the manual of the con-
nected command option mocule.
5-40
Mode
Tuning Mode = 0
n.0
Adjusted without the
friction compensation
[Factory
function
setting]
Adjusted with the
n.1 friction compensation
function
Parameter
n.0
Model following control is not used together with the
[Factory
speed/torque feedforward input.
setting]
Model following control is used together with the
n.1
speed/torque feedforward input.
• Model following control is used to make optimum feedforward settings in the SERVO-
PACK when model following control is used with the feedforward function. Therefore,
model following control is not normally used together with either the speed feedfor-
ward input or torque feedforward input from the host controller. However, model fol-
lowing control can be used with the speed feedforward input or torque feedforward
input if required. An improper feedforward input may result in overshooting.
Tuning Mode = 1 Tuning Mode = 2
Adjusted without the
friction compensation
Adjusted with the
function
friction compensation
Adjusted with the
function
friction compensation
function
Function
Tuning Mode = 3
Adjusted with the
friction compensation
function
When Enabled Classification
Immediately Tuning