Mitsubishi Electric MR-J4W2-0303B6, Instruction Manual

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10. CHARACTERISTICS
10 - 1
10. CHARACTERISTICS
POINT
For the characteristics of the linear servo motor and the direct drive motor, refer
to sections 14.4 and 15.4.
10.1 Overload protection characteristics
An electronic thermal is built in the servo amplifier to protect the servo motor, servo amplifier and servo
motor power wires from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve
shown in fig. 10.1 [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-hand side area of the continuous or
broken line in 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 less of the rated torque.
This servo amplifier has solid-state servo motor overload protection for each axis. (The servo motor overload
current (full load current) is set on the basis of 120% rated current of the servo amplifier.)
(Note 1, 2) Load ratio [%]
1000
100
10
1
0.1
100 200 300 350 0 50 150 250
Operating
Servo-lock
Oper
ation time [s]
1000
100
10
1
0.1
100 200 300 400 0 50 150 250 350
(Note 1, 2, 3) Load ratio [%]
Operation time [s]
Operating
Servo-lock
HG-KR053/HG-KR13
HG-MR053/HG-MR13
HG-KR23/HG-KR43/HG-KR73
HG-MR23/HG-MR43/HG-MR73
HG-SR51/HG-SR81/HG-SR52/HG-SR102
HG-UR72
HG-JR53/HG-JR73/HG-JR103
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 servo amplifier may malfunction
regardless of the electronic thermal protection.
2. The load ratio ranging from 300% to 350% applies to the HG-KR series servo motor.
3. The load ratio ranging from 350% to 400% applies to the HG-JR53 servo motor.
Fig. 10.1 Electronic thermal protection characteristics