Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 280

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-hand side area of the continuous or
broken line in the graph.
When unbalanced torque is generated, such as in a vertical lift machine, the unbalanced torque of the
machine should be kept at 70% or lower of the motor's rated torque.
This servo amplifier has solid-state servo motor overload protection. (The servo motor overload current (full
load current) is set on the basis of 120% rated current of the servo amplifier.)
POINT
For the characteristics of the linear servo motor and the direct drive motor, refer
to sections 14.4 and 15.4.
The MR-J4-11KTM(4) to MR-J4-22KTM(4) will be available in the future.
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