
B-65270EN/05 4.SERVO FUNCTION DETAILS
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(4) Setting parameters
1988 (FS15i)
Feed-forward timing adjustment coefficient
(*1)
2095 (FS30i, 16i)
Specifying +4096 causes the feed-forward timing to advance by 1 ms.
Specifying -4096 causes the feed-forward timing to delay by 1 ms.
If you want to decrease the radius of an arc at high-speed cutting,
increase the coefficient by about 300 at each step.
If you want to increase the radius of an arc at high-speed cutting,
decrease the coefficient by about 300 at each step.
This parameter is valid for advanced preview feed-forward control
(parameter Nos. 1985 and 1767 (Series 15i) and parameter Nos. 2092
and 2144 (Series 30i, 16i, and so on). It is invalid for conventional
feed-forward control type (parameter No. 1961 (Series 15i) and
parameter No. 2068 (Series 16i and so on)).
(*1) Old documents may refer to this function as "machine distortion
compensation coefficient."
With the following servo software, the feed-forward timing slightly
differs when the fine acc./dec. function is used, so a separate
parameter is prepared for independent setting.
Series and editions of applicable servo software
(Series 15i-B,16i-B,18i-B,21i-B,0i-B,0i Mate-B,Power Mate i)
Series 90B0/J(10) and subsequent editions
Series 90B1/A(01) and subsequent editions
Series 90B6/A(01) and subsequent editions
(Series 0i-C,0i Mate-C,20i-B)
Series 90B5/A(01) and subsequent editions
2808 (FS15i)
2395 (FS30i, 16i)
Feed-forward timing adjustment coefficient (to be used when fine acc./dec.
is enabled)
* If fine acc./dec. is specified and is used in one of the following
modes:
• Simple cutting feed (no high-precision mode)
• Advanced preview control
• AI advanced preview control (Series 21i)
This parameter can set the timing adjustment coefficient to
parameter No. 1988 + parameter No. 2808 (for the Series 15i)
and
parameter No. 2095 + parameter No. 2395 (for the Series 16i and
so on).
In other high definition modes (modes in which fine acc./dec. is
disabled, such as AI contour control), the timing adjustment
coefficient is set to
parameter No. 1988 (for the Series 15i)
parameter No. 2095 (for the Series 16i and so on).
This parameter allows setting of different timing adjustment
coefficients depending on whether fine acc./dec. is enabled or
disabled.