5. Spindle Adjustment
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(3) Adjusting the variable current loop gain
In most cases, problems will not occur when the default value is used. This loop gain must be
adjusted if fine vibration occurs while the spindle motor is rotating at a high speed. Adjust the
current loop gain at the high-speed range, so that the output current to the spindle motor is stable.
• If fine vibration occurs at high-speed range : Decrease SP069 in increments of
approx. 8
• When speed fluctuates (is unstable) at high-speed range : Increase SP069 in increments of
approx. 8
No. Abbr. Parameter name Details Setting range Standard
SP069 VIGN*
Target value of variable
current loop gain
Set the magnification of current loop gain (torque
component and excitation component) for a change
ending speed defined in SP068 (VIGWB).
When this parameter is set to "0", the magnification is 1.
SP067 SP017SP068
Speed
1-fold
SP069×(1/16)-fold
0 to 32767
(1/16-fold)
0
SP017 (TSP)
Maximum
motor speed
SP067
(VIGWA)
SP068
(VIGWB)
SP069
(VIGN)
0 to 6000 0 0 0
6001 to 8000 5000 8000 45
8001 or more 5000 10000 64
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