
4.ADJUSTMENT FANUC AC SPINDLE MOTOR αCi series B-65280EN/05
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4.1 VELOCITY LOOP GAIN ADJUSTMENT
4.1.1 Overview
Optimum adjustment of the velocity loop gain increases the position
loop gain, therefore significantly enhancing disturbance suppression
performance, positioning speed and accuracy. So, the adjustment of
the velocity loop gain is very important in servo adjustments, and it
should be performed first. This section explains the parameters for
velocity loop gain adjustment and the adjustment procedure.
To check the waveform of a torque command, position error, or so on,
use the spindle check board and an oscilloscope, or the servo guide
(see Appendix F).
4.1.2 Parameters
There are four operation modes in spindle control: velocity control
mode, orientation, servo mode (rigid tapping and spindle positioning),
and spindle synchronous control. There are parameters corresponding
to each operation mode and to the clutch/gear signals (CTH1A and
CTH2A). The following shows the parameters for each operation
mode.
(1) Velocity control mode
15i 16i 30i
3040 4040 4040
Velocity loop proportional gain on velocity control mode (HIGH) CTH1A=0
3041 4041 4041
Velocity loop proportional gain on velocity control mode (LOW) CTH1A=1
Unit of data :
Valid data range : 0 to 32767
Standard setting value : Depends on the motor model.
15i 16i 30i
3047 4047 4047
Velocity loop integral gain on velocity control mode (HIGH) CTH1A=0
3048 4048 4048
Velocity loop integral gain on velocity control mode (LOW) CTH1A=1
Unit of data :
Valid data range : 0 to 32767
Standard setting value : Depends on the motor model.