Mitsubishi Electric MELSERVO-J3 Series Handbook page 240

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
The following graphs show overload protection characteristics.
1000
100
Servo-lock
10
1
0 50 100
(Note 2)
Load ratio [%] (Note 1, 3)
Characteristics A
Note 1. If operation that generates torque more than 100% of the rating is performed with an abnormally high frequency in a servo
motor stop status (servo-lock status) or in a 50 r/min or less low-speed operation status, the drive unit may malfunction
regardless of the electronic thermal protection.
2. Load ratio 100% indicates the rated output of the drive unit. Refer to "MR-CV_/MR-CR55K_/MR-J4-DU_(-RJ) instruction
manual".
3. The operation time at the load ratio of 300% to 400% applies when the maximum torque is increased to 400% of rated torque.
For the combination of a servo amplifier and servo motor with which the maximum torque can be increased, refer to "Part 1:
3.3.2 (3) Servo amplifier and servo motor combination for the MR-J4 series".
(3) For the MR-CR_ converter unit
Note. Load ratio 100% indicates the rated output of the resistance regeneration converter
Operating
150 200 250 300 350
Fig. 5.2 Overload protection characteristics.
10000
1000
100
10
1
0 50
unit. Refer to "MR-CV_/MR-CR55K_/MR-J4-DU_(-RJ) instruction manual".
Fig. 5.3 Overload protection characteristics
10000
1000
100
Servo-lock
10
1
400
0 50
Operating
100 150 200
Load ratio [%] (Note)
5 - 45
Operating
100 150 200
(Note 2)
Load ratio [%] (Note 1)
Characteristics B
250 300
250 300