Mitsubishi Electric Melservo MR-J3-100B, Руководство пользователя

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Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
5 - 43
6. CHARACTERISTICS
6.1 Overload protection characteristics
An electronic thermal relay is built in the converter unit and drive unit to protect the servo motor, converter
unit and drive unit from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve
shown in fig. 5.1, 5.2 and 5.3. [AL. 51 Overload 2] occurs if the maximum current is applied continuously for
several seconds due to machine collision, etc. Use the equipment on the left-side area of the graph.
For the system where the unbalanced torque occurs, such as a vertical axis system, the unbalanced torque
of the machine should be kept at 70% or lower of the motor's rated torque.
The MR-J3-DU_ and MR-J4-DU_ servo amplifiers have servo motor overload protective function.
(1) For the MR-J3-DU_
10000
1000
100
10
1
0 100 200 250
Operating
(Note 2)
Op
e
rati
o
n
tim
e
[s]
Load ratio [%]
Converter unit
10000
1000
10
100
1
0 100 200 250
Servo-lock
Operating
(Note 2)
Op
e
rati
o
n
tim
e
[s
]
Load ratio [%] (Note 1)
Drive unit
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 30 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 each converter unit and drive unit. Refer to "MR-J3-_A_ /MR-J3-_B_Servo
amplifier instruction manual"
Fig. 5.1 Overload protection characteristics