IAI America NS - Manual (Page 53)

39
10. Notes on Operation
10.2 Use your actuator at duties not exceeding the calculated reference duty.
“Duty” indicates the utilization rate of an actuator (time during which the actuator operates in a cycle).
Use your actuator at duties not exceeding the reference duty calculated as follows. If the actuator is used at
duties exceeding the reference duty, the actuator may receive an overload or its motor may generate heat.
In extreme cases, motor damage or other undesired result may follow.
Duty = Operating time / Operating time + Standstill time (%)
Caution: If an overload error occurs, increase the standstill time to lower the duty or decrease
the acceleration/deceleration.
[How to Calculate Duty]
[1] Calculate the load factor LF using the calculation formula below:
(Note) For the maximum payload capacity at rated acceleration, and rated acceleration/deceleration,
refer to 6, “Specifications.”
[2] Calculate the acceleration/deceleration time ratio t
od
using the calculation formula below:
Acceleration/deceleration time ratio t
od =
Acceleration time + Deceleration time / Operating time (%)
Acceleration time = Speed (mm/s) / Acceleration (mm/s 2 ) (sec.)
Acceleration (mm/s 2 ) = Acceleration (G) x 9,800 mm/s 2
Deceleration time = Speed (mm/s) / Deceleration (mm/s
2
) (sec.)
Deceleration (mm/s 2 ) = Deceleration (G) x 9,800 mm/s 2
[3] Find the reference duty on a graph of calculated load factor LF vs. acceleration/deceleration time ratio t
od
.
Example) If the load factor LF is 80% and acceleration/deceleration time ratio t
od
is 80%,
the reference duty is approx. 75%.
LF = Less than 50%
LF = 60%
LF = 70%
LF = 80%
LF = 90%
LF = 100%
Reference duty (%)
Load factor (%)
Acceleration/deceleration time ratio t od (%)
Approx. 75%
100
80
60
40
20
0
0 20 40 60 80 100
[When commanded acceleration speed is lower than the
rated acceleration speed]
L o a d fa cto r : L F = M × ǩ / M r × ǩ r
M axim um payload capacity at rated acceleration : M r
Ra te d a c ce le ra tio n /d e ce le ra tio n : ǩ r
Tra n s fe r w e ig h t d u rin g o p e ra tio n : M
A cc e le ra tio n /d e c e le ra tio n d u rin g o p e ra tio n : ǩ
[When commanded acceleration speed is higher than the
rated acceleration speed]
L o a d fa cto r : L F= M × ǩ / M × ǩ
ǩ
= M / M d d [%]
d Transportable weight in commanded acceleration : M
Tra n s fe r w e ig h t d u rin g o p e ra tio n : M
A c c e le ra tio n /d e c e le ra tio n d u rin g o p e ra tio n :
[kg]
[kg]
[G]
[%]
[kg]
[G]
[kg]
[G]