
3. α SERIES PARAMETER ADJUSTMENT B-65150E/04
− 86 −
<4> Set a highest possible position gain. While viewing the VCMD
waveform, make an adjustment so that the overshoot value lies
within a requested precision. After setting a position gain,
perform rapid traverse for a long distance to check that low-
frequency vibration due to an excessively increased position gain
does not occur. If the set position gain is too high, vibration after
an overshoot exceeds a requested precision. An overshoot itself
can be suppressed to some extent by adjustment of <5>.
Fig. 3.4.4 (e) Adequate position gain Fig. 3.4.4 (f) Excessively high position gain
<5> Make a fine PK1V adjustment to eliminate an overshoot and
undershoot. If a large value is set for PK1V, a large undershoot
occurs.
Fig. 3.4.4 (g) After PK1V adjustment Fig. 3.4.4 (h) When the value of PK1V is too large
TCMD
VCMD
When the value of PK1V is
increased, the amount of an
overshoot decreases.
TCMD
VCMD
20
µ
m
210 ms
When the value of PK1V is
increased excessively, the amount
of an undershoot increases.
TCMD
VCMD
20
µ
m
200 ms
When a precision of 10 µm is
requested, adjust the overshoot value
to within 10
m.
If the position gain is too high, the
requested precision 10 µm is
A large vibration occurs in a
return movement. Suppress the
vibration to within 50% of the
requested precision.