
B–65160E/02
3. EXPLANATION OF
PARAMETERS
FANUC AC SPINDLE MOTOR aC series
289
16i/16
15
15i
0
Acceleration/Deceleration time constant (HIGH)
CTH1 = 0, CTH2 = 0
6569 3069 3069 4069
6709 3209
Acceleration/Deceleration time constant (MEDIUM HIGH)
CTH1 = 0, CTH2 = 1
6570 3070 3070 4070
6710 3210
Acceleration/Deceleration time constant (MEDIUM LOW)
CTH1 = 1, CTH2 = 0
6571 3071 3071 4071
6711 3211
Acceleration/Deceleration time constant (LOW)
CTH1 = 1, CTH2 = 1
6572 3072 3072 4072
6712 3212
Data unit : min
–1
/sec
Data range : 0 to 32767
Standard setting : 900
The ability of acceleration/deceleration of the α C series is depends on the
acceleration/deceleration time constant parameter. The setting of this
parameter is determined by the motor torque and spindle inertia. The
initial setting of this parameter is 900(rpm/sec), so we have to set and
adjust this parameter by the 30min rated torque and spindle inertia on each
machine.
Motor output characteristic Acc/Dec time constant =Tc[min
–1
/sec]
Rotor inertia =Jm[kg cm sec
2
]
Load inertia =JL[kg cm sec
2
]
(Converted to motor shaft)
30min rated output =P [kW]
30min rated torque =T [kg m]
T[kg m] = P[kW]/N[min
–1
] 1000/1.0269
30min rated output (Note1)
Continuous rated output
Nb Nm [min
–1
]
[kW]
Note1) There is 10min or 15min rated output
depending on the motor model
Acc / Dec_time_const:Tc [min
–1
/ sec] =
(Jm ) JL)[kgcmsec
2
]
100
T [kgm]
2p
60
D The initial setting of this parameter :
N[min
–1
]=Nm[min
–1
], Jm+JL=Jm+3*Jm
D The maximum setting of this parameter is determined by the
30min output torque at the base speed(Nb) and spindle
inertia.
Example