
4. SERVO FUNCTION DETAILS B-65150E/04
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<9> Stage 1 and stage 2 acceleration override adjustment
Stage 1 and stage 2 acceleration amounts can be overridden
according to the circular acceleration.
When using the stage 1 acceleration override function, set the
following. (Normally, this setting is not needed.)
1760
−
Stage 1 acceleration override
2137
−
[Valid data range] 0 to 32767
When the stage 1 acceleration override function is used, the stage 1
acceleration amount of two-stage backlash acceleration is found from
the following formula:
(Stage 1 acceleration amount)
(Stage 1 override setting)
= × 1 + α ×
1024
Here, let α be a circular acceleration, R be a radius (mm), F be a
circular feedrate (mm/min), and P be a detection unit (mm). Then, α
can be expressed as:
2
α = (F/60 × 0.008)
2
P
R
If the feedrate is low, α → 0. So, the value of the second term in the
acceleration formula above becomes 0, so that acceleration is
performed using the stage 1 acceleration amount setting.
This means that the stage 1 override setting and acceleration amount
are related as follows:
1024 (Stage 1 acceleration amount)
= × − 1
α (Stage 1 acceleration amount setting)
(Example)
To obtain a stage 1 acceleration amount that is two times the setting
when R10 F4000 (with a detection unit of 1 µm)
2
α = (4000/60 × 0.008)
2
0.001 = 56.9
10
1024 2
(Stage 1 override setting) = × − 1 = 18
56.9 1
From the above, set 18 as the override.
When using the stage 2 acceleration override function, set the
following.
(Stage 1 acceleration
amount setting)
(Stage 1
override
setting)