
2.EXPLANATION OF OPERATION MODES FANUC AC SPINDLE MOTOR αCi series B-65280EN/05
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(3) Make a comparison with the case of motor coasting.
If vibration and sound produced when the motor coasts are
extremely smaller than those produced when the motor is driven,
the control circuit is faulty. If sound produced remains
unchanged, the motor or the machine may be faulty. If the
overheat signal cable from the motor is disconnected during
motor rotation, an alarm is issued, and the motor coasts. Before
performing the coasting of the motor, consult with the machine
tool builder for confirmation. Depending on the sequence, the
brake may be applied.
(iv) When an overshoot or hunting occurs
(1) Check the parameter settings.
(a) The velocity loop gain may be too large. Adjust the
following parameters:
15i 16i 30i
Description Setting data
3040 4040 4040 Velocity proportional gain(HIGH)
3041 4041 4041 Velocity proportional gain(LOW)
3048 4048 4048 Velocity integral gain (HIGH)
3049 4049 4049 Velocity integral gain (LOW)
Decrease the
setting values.
(b) The acceleration/deceleration constant may be too large.
Adjust the following parameters:
15i 16i 30i
Description Setting data
3069 4069 4069
Acceleration/deceleration constant
(HIGH)
3070 4070 4070
Acceleration/deceleration constant
(MIDIUM HIGH)
3071 4071 4071
Acceleration/deceleration constant
(MIDIUM LOW)
3072 4072 4072
Acceleration/deceleration constant
(LOW)
Decrease the
setting values.
(v) When the cutting capability is degraded
(1) Check the parameter settings.
(a) Parameter data for each motor model
(2) Check the input signals.
(a) Torque limitation command (TLMHA)
15i 16i 30i
#7 #6 #5 #4 #3 #2 #1 #0
1st- G227 G070 G070 TLMHA
2nd- G235 G074 G074 TLMHB
(3) Check the machine.
(a) Belt tension, and so forth