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9. Adjustment
9 - 5
A42
A47
Motor unit Motor unit
<When machine resonance does not occur at the standard VGN1>
Set the standard VGN1. Use the standard value if
no problem (such as machine resonance) occurs. If
sufficient cutting precision cannot be obtained at the
standard VGN1, VGN1 can be raised above the
standard value as long as a 70 percent margin in respect to the machine resonance occurrence limit is
maintained. The cutting accuracy can also be improved by adjusting with the disturbance observer.
<When machine resonance occurs at the standard VGN1>
Machine resonance is occurring if the shaft makes abnormal sounds when operating or stopping,
and a fine vibration can be felt when the machine is touched while stopped. Machine resonance
occurs because the servo control responsiveness includes the machine resonance points. (Speed
control resonance points occur, for example, at parts close to the motor such as ball screws.)
Machine resonance can be suppressed by lowering VGN1 and the servo control responsiveness,
but the cutting precision and cycle time are sacrificed. Thus, set a vibration suppression filter and
suppress the machine resonance (Refer to section "9-3-2 Vibration suppression measures"), and
set a value as close as possible to the standard VGN1. If the machine resonance cannot be
sufficiently eliminated even by using a vibration suppression filter, then lower the VGN1.
No. Abbrev. Parameter name Explanation Setting range
SV005 VGN1 Speed loop gain 1
Set the speed loop gain. Set this according to the load inertia size.
The higher the setting value is, the more accurate the control will be,
however, vibration tends to occur. If vibration occurs, adjust by lowering
by 20 to 30%. The value should be determined to be 70 to 80% of the
value at the time when the vibration stops.
1 to 999
POINT
The final VGN1 setting value is 70 to 80% of the maximum value at which the
machine does not resonate.
Suppressing the resonance with the vibration suppression function and increasing
the VGN1 setting is effective for adjusting the servo later.
Load inertia scale (%)
100
200
0
500250
400
300
100 200
400
600300 500
HF353
HF203
HF53, 103, 153
Load inertia scale (%)
Standard
VGN1
50
100
0
200
150
100 200 400 600300 500
HF74
HF44