Delta ASDA-A3 Series User Manual page 1294

ASDA-A3
A.3.4 Overload features
Definition of overload protection
The overload protection prevents the motor from overheating.
Causes of overload
1. The motor's operating torque exceeds the rated range and the operating time is too long.
2. The inertia ratio is too high and the motor frequently accelerates and decelerates.
3. Incorrect wiring of the power and encoder cables.
4. Incorrect servo gain setting causes resonance in the motor.
5. A motor with a built-in brake operates without the brake released.
Graph of load and operating time
220V series: low inertia (ECM-B3L series), medium inertia (ECM-B3M-C series)
400V series: medium inertia (ECM-B3M-J series)
(s)
4
10
3
10
2
10
1
10
0
10
100
Load ratio
Operating time
Load ratio
Operating time
150 200 250
120% 140%
263.8 s 35.2 s 17.6 s
260% 280%
3.9 s 3.3 s
300 350
160% 180% 200%
11.2 s
300% 350% 400%
2.8 s 2.1 s 1.6 s
Specifications
(%)
400 450 500
220% 240%
8 s 6.1 s 4.8 s
450% 500%
1.2 s 1.0 s
A
A-57