
B–65160E/02
2. FUNCTION EXPLANATION
FANUC AC SPINDLE MOTOR a series
53
16i/16015
15i
Spindle orientation deceleration constant (HIGH)
CTH1A=0, CTH2A=0
6284 3464 3320 4320
6464 3684
1st–
2nd–
Spindle orientation deceleration constant (MEDIUM HIGH)
CTH1A=0, CTH2A=1
6285 3465 3321 4321
6465 3685
1st–
2nd–
Spindle orientation deceleration constant (MEDIUM LOW)
CTH1A=1, CTH2A=0
6286 3466 3322 4322
6466 3686
1st–
2nd–
Spindle orientation deceleration constant (LOW)
CTH1A=1, CTH2A=1
6287 3467 3323 4323
6467 3687
1st–
2nd–
Data unit :
Data range : 0 to 32767
Standard setting : 0
These parameters set the deceleration constants for shortest–time spindle
orientation.
When the parameter is set to 0, the normal orientation control method is
used.
The value to be set can be calculated using the following expression:
Setting +
Nb
Tb
120
GEAR
GEARUNIT
(0.8 to 0.9)
where,
Nb : Spindle motor base speed [min
–1
]
Tb : Time required for the spindle motor to accelerate from
the stop state to the base speed [sec]
GEAR : Gear ratio parameter (parameter Nos. 4056 to 4059)
GEARUNIT : Increment system for the gear ratio parameters
When bit 1 of parameter No. 4006 (GRUNIT) is set to
0, GEARUNIT = 100
When bit 1 of parameter No. 4006 (GRUNIT) is 1,
GEARUNIT = 1000
When the speed increment system is 10 min
–1
(bit 2 of parameter No.
4006 is set to 1), a value equal to one–tenth of the value calculated from
the above expression must be set.
For example, suppose the following:
Spindle motor base speed Nb = 1500 min
–1
Time required for the spindle motor to accelerate from the stop state
to the base speed Tb = 1 sec
Gear ratio parameter value (Nos. 4056 to 4059) Gear = 200
Increment system for the gear ratio parameter GEARUNIT = 100
Then,
Setting +
1500
1
120
200
100
(0.8 to 0.9) + 480 to 540
Since the base speed of the spindle motor is 1500 min
–1
and the gear ratio
is 1:2 in this example, spindle motor acceleration time Tb is the time
needed to reach 750 min
–1
from the stop state.