Mitsubishi Electric MR-JE-_A, Instruction Manual

Page: 266 / 370

10. CHARACTERISTICS
10 - 1
10. CHARACTERISTICS
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-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 lower of the motor's rated torque.
This servo amplifier has servo motor overload protective function. (The servo motor overload current (full
load current) is set on the basis of 120% rated current of the servo amplifier.)
1000
100
10
1
0.1
100 200 300 350 0 50 150 250
Operating
(Note) Load ratio [%]
Operation time [s]
Servo-lock
Operation time [s]
1000
100
10
1
0.1
100 200 300 0
Servo-lock
Operating
50 150 250
(Note) Load ratio [%]
320
HG-KN13_ HG-KN23_/HG-KN43_/HG-KN73_/
HG-SN52_/HG-SN102_