
B-65270EN/05 4.SERVO FUNCTION DETAILS
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<6> For the vertical axis
, adjust the torque offset. (This is
unnecessary for the horizontal axis.)
For the vertical axis, the estimated disturbance value is not
centered at level 0. Torque offset adjustment is done to center the
estimated disturbance value at level 0.
1980 (FS15i)
Torque offset parameter
2087 (FS30i, 16i)
[Unit of data] TCMD unit (7282 with the maximum current value of the amplifier)
[Valid data range] -7282 to 7282
(Example of torque offset setting)
Estimated disturbance values for constant-velocity movements in
the + direction and - direction are read. In the figure below,
minimum value A (signed) is read in a movement in the +
direction, and maximum value B (signed) is read in a movement
in the - direction. A torque offset parameter setting is given using
the following expressions:
A [Ap] + B [Ap]
Torque offset =
Maximum amplifier current value [Ap]
× 3641
1A
Estimated disturbance
value level 0
Estimated disturbance
value center line
Influence by gravity
Maximum value B
Minimum value A
If you read the minimum and maximum values as -1.9 [Ap] and -0.1
[Ap] in the above chart (the amplifier used is rated at 40 [Ap]
maximum), the torque offset parameter = -[(-1.9) + (-0.1)]/40 × 3641
= 182. The following chart applies when the parameter is set with 182.