
4.SERVO FUNCTION DETAILS B-65270EN/05
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(3) Setting parameters
<1> This parameter specifies whether to enable the position gain
switching function as follows:
#7 #6 #5 #4 #3 #2 #1 #0
1957 (FS15i)
PGTW
2015 (FS30i, 16i)
PGTW The position gain switching function is used.
1: Valid
0: Invalid
<2> This parameter specifies whether to set the velocity at which
position gain switching is to occur, as follows:
1713 (FS15i)
Limit speed for enabling position gain switching
2028 (FS30i, 16i)
The position gain is doubled with a speed lower than or equal to the
speed specified above.
[Unit of data] Rotational motor: 0.01 min
-1
Linear motor: 0.01 mm/min
[Valid data range] 0 to 32767
[Recommended value] 1500 to 5000
REFERENCE
Using the high-speed positioning velocity increment
system magnification function (→ (5) in Subsec.
4.8.1) can increase the effective velocity to ten
times.
Fig. 4.8.1 (a) shows the relationships between the position error and
velocity command.
(4) When the feed-forward function is used at the same time (position gain
switching function type 2)
When using the position gain switching function together with the
feed-forward function, make the setting below.
(a) Overview
When the conventional position gain switching function is used in
conjunction with the feed-forward function, it can cause an overshoot
at a relative low feed-forward coefficient, sometimes resulting in a
difficulty in adjustment, because also the feed-forward term-based
effect is doubled. Position gain switch function type 2 has been
improved to make position gain switching independently of the
feed-forward function.