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5. Spindle Adjustment
5 - 32
(6) Adjusting speed loop gain
The speed loop gain adjustment is made to improve the high-speed range characteristics for
speeds of 10,000r/min and higher. Use only the motor-specific standard settings for the basic
parameters (SP022, SP023).
If the problems shown below occur during constant-speed operation at a speed of 10,000r/min or
higher, adjust the target value of variable speed loop proportional gain (SP065) and the change
starting speed of variable speed loop proportional gain (SP066) parameter settings.
1) A swell or spike appears in the current waveform
2) An overvoltage condition (alarm 32) occurs
If the maximum speed is 10,000 r/min or less, or if no improvement is seen after adjusting the
speed loop gain, then adjust the current loop gain.
No. Abbr. Parameter name Details
Setting
range
Standard
SP022 VGNP1* Speed loop gain
proportional term
under speed control
0 to 1000 63
SP023 VGMI1* Speed loop gain
integral term under
speed control
Basically, use standard setting value set for each motor.
0 to 1000 60
SP065 VCGN1* Target value of
variable speed loop
proportional gain
Set the magnification of speed loop proportional gain with
respect to SP022 (VGNP1) at the maximum motor speed
defined in SP017 (TSP).
0 to 100
(%)
100
SP022
SP022×
(SP065/100)
SP066 VCSN1* Change starting
speed of variable
speed loop
proportional gain
Set the speed when the
speed loop proportional
gain change starts.
Set 10,000 normally.
0 SP066 SP017
0 to 32767
(r/min)
0
Adjusting SP065
Abnormal current waveform
alarm activated?
SP065 adjustment completed
Increase SP065 by –10.
YES
Measure acceleration/deceleration
waveform at high speed
SP065=30?
NO
Set SP065=100,
SP066=10000
YES
Adjust the current loop gain