
B–65152E/03
7. DETERMINING THE
ALLOWABLE DUTY CYCLE
BCATLTLON EOT TFC α
45
NOTE
2 In case that P
3
is calculated by the load indicator voltage,
use the following equation.
P
3
=P
1
L
3
/10 [kW] (L
3
: Load indicator voltage in cutting [V])
From the equation for getting the value of Pav.
Dt +
1
Pav
2
(P
1
2
t
1
) P
2
2
t
2
) P
3
2
t
3
) P
4
2
t
4
)
Substitute the continuous rated output of the used AC spindle motor for
Pav [kW] in the equation above.
Example) To obtain the allowable duty cycle when model α3 accelerates
and decelerates repeatedly without load (P
2
=P
3
=0).
`Continuous rated output Pav=Pcont=3.7kW
`Acceleration/deceleration output
P
1
=P
4
=5.5kW 1.2=6.6kW
(This is not a guaranteed value but a guideline.)
`Acceleration time t
1
=3s, deceleration time t
4
=3s
Dt +
1
3.7
2
(6.6
2
3 ) 6.6
2
3) +
6.6
2
3.7
2
(2 3) + 19.08 s
As shown above, when model α 3 accelerates and decelerates
repeatedly, the allowable duty cycle is 3.18 times the sum of
the acceleration time and deceleration time.
t
1
t
4
P
1
P
4
Dt
Dt +
1
P
cont
2
(P
30min
1.2)
2
(t
1
) t
4
)
P
cont
: Continuous rated output
P
30min
: 30–minute rated output
(10 min or 15 min rated output apply for some models.)
t
1
+t
4
: Sum of the acceleration and deceleration time
Allowable duty cycle
time Dt
Allowable duty cycle
time Dt for repeated
acceleration/deceleration