Characteristics; Overload Protection Characteristics - Mitsubishi Electric MELSERVO-JE MR-JE-70A Instruction Manual

10. CHARACTERISTICS

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, it is recommended that
the unbalanced torque of the machine be kept at 70% or less 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.)
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