
FANUC AC SPINDLE MOTOR a series
1. ADJUSTMENT
B–65160E/02
36
(1) Check all connections. (See the description of the connections.)
(a) Motor power line connection
(b) Feedback signal cable connection
(2) Check the parameter settings.
(a) Parameter data for each motor model (See Appendix C.)
(b) Detector–related parameters (See Section 1.2.4.)
(c) Setting of maximum motor speed
0 15 15i 16i/16 Description
6520 3020 3020 4020 Maximum motor speed
(d) Parameters related to spindle speed commands
(See Section 1.2.3.)
(3) Check the feedback signals.
(a) Feedback signal levels (Refer to the description of the operation
check in the maintenance manual.)
(b) Shielding and grounding (Refer to the description of the
connections.)
(1) Check the feedback signals.
(a) Feedback signal levels (Refer to the description of the operation
check in the maintenance manual.)
(b) Shielding and grounding (Refer to the description of the
connections.)
(2) Check the parameter settings.
(a) The velocity loop gain value may be too large. Adjust the
parameters indicated below.
0 15 15i 16i/16 Description Settings
6540 3040 3040 4040
Velocity loop
proportional gain
(HIGH)
Specify a
6541 3041 3041 4041
Velocity loop
proportional gain
(LOW)
smaller
value.
(b) In a high–speed rotation area, a speed variation of several Hz (3
Hz to 5 Hz) can occur because of a high motor voltage during
rotation under no load.
Such a vibration can be eliminated by changing the motor voltage
pattern under no load. Change the parameters indicated below.
0 15 15i 16i/16 Description Settings
6507 #7 3007 #7 3007 #7 4007 #7
Motor voltage pattern
under no load
1
1.3.2
When the Motor Does
Not Rotate at the
Commanded Speed
1.3.3
When the Motor
Vibrates and Generates
Noise while Rotating