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Chapter 10 Adjustment
10–20
(2) Adjusting for feed forward control
Use OVS compensation type 3 if overshooting is a problem in contour cutting during feed forward
control.
If OVS compensation type 3 is used to attempt to compensate overshooting, the overshooting
may conversely become larger, or projections may appear during arc cutting. This is because
overshooting equivalent to the operation fraction unit occurs in the position commands when the
CNC is carrying out feed forward (fwd) control. Because of this, the OVS compensation
recognizes a change in the command direction, and executes the compensation in the opposite
direction.
If the compensation is in the opposite direction when carrying out feed forward control, adjust with
the non-sensitive band (SV034: SSF3 bit12 to 15: ovsn) during feed forward control. By ignoring
overshooting of a set width in the ovsn or less, the command direction change point is correctly
recognized, and the OVS compensation is correctly executed.
This parameter is insignificant when feed forward control is not used.
<Adjustment method>
If the OVS compensation is carried out in reverse during feed forward control, increase the LMCT
setting by 1µm at a time.
Note that 2µm are set even when the LMCT is set to 0.
POINT
OVS compensation type 3 is used if overshooting is a problem with contour
cutting during feed forward control.
No. Abbrev. Parameter name Explanation
SV027 SSF1 The overshooting compensation starts with the following parameter.
Special servo function
selection 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
aflt zrn2 afrg afse ovs2 ovs1 lmc2 lmc1 omr vfct2 vfct1 upc
vcnt
2
vcnt
1
bit Meaning when "0" is set. Meaning when "1" is set.
10 ovs1
Overshooting compensation
type 2 stop
Overshooting compensation type
2 start
11 ovs2
Overshooting compensation
type 3 stop
Overshooting compensation type
3 start
No. Abbrev.
Parameter
name
Unit Explanation Setting range
SV031 OVS1 Overshooting
compensation 1
Stall % (rated
current %)
Increase the value by 1% at a time, and find the value where
overshooting does not occur. When OVS2 is set to 0, the
setting value will be applied in both the ± directions.
–1 to 100
(%)
SV042 OVS2 Overshooting
compensation 2
Stall % (rated
current %)
Set 0 as a standard.
Set this when the compensation amount is to be changed
according to the direction.
–1 to 100
(%)
No. Abbrev. Parameter name Explanation
SV034 SSF3 The overshooting compensation starts with the following parameter.
Special servo function
selection 3
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ovsn linN toff os2 dcd test mohn has2 has1
bit Explanation
12
Set the non-sensitive band for the overshooting compensation
type 3.
13
14
15
ovsn