
FANUC AC SPINDLE MOTOR a series
2. FUNCTION EXPLANATION
B–65160E/02
116
16i/1601515i
The constant of the torque disturbance compensating
(Acceleration feedback gain)
6594 3094 3094 4094
Data unit :
Data range : 0 to 32767
Standard setting : 0
This parameter specifies the constant for compensating for a disturbance
torque in Cs contouring control mode.
Setting this parameter may improve the cutting stability.
When this parameter is set, the velocity loop proportional gain (parameter
No. 4046) can be increased, which may improve the rigidity.
As a guideline, specify 500 to 2000 for this parameter.
Never specify a value of 4000 or more for this parameter.
16i/1601515i
Spindle speed feedback gain
6597 3097 3097 4097
Data unit : 0
Data range : 0 to 32767
Standard setting : 0
This parameter is set to feed back spindle speed and compensate for torque
disturbance in Cs contouring control in systems where spindles and
spindle motors are linked by gears or belts.
When the spindle and motor are linked by a belt, control stability may be
improved by enabling spindle speed feedback.
As a guideline for setting this parameter, specify a value that is almost
equal to the velocity loop proportional gain set in parameter No. 4046 (10
to 50).
16i/1601515i
Delay time for motor excitation
6599 3099 3099 4099
Data unit : 1ms
Data range : 0 to 32767
Standard setting : 0
This parameter specifies the time required to achieve stable motor
activation in Cs contouring control mode.
When switching to Cs contouring control mode, a stop–time excessive
error alarm may be issued intermittently.
This is because an abrupt change in the motor excitation status causes a
transient state to be generated in the motor, causing the motor to move
very slightly.
If such an alarm is issued, specify this parameter.
Generally, specify about 400 (= 400 msec).