Chapter 5 Characteristics; Overload Protection Characteristics - Mitsubishi Electric MELSERVO MR-J5 Series User Manual

5
CHARACTERISTICS
For the characteristics of the linear servo motor and the direct drive motor, refer to the following.
Page 540 Characteristics
Page 577 Characteristics
5.1

Overload protection characteristics

Precautions
Servo amplifiers running firmware version A7 or later have improved overload protection for rotary servo motors. Overload
protection is triggered in a shorter period of time compared to servo amplifiers running version A6 or earlier, so depending on
the operation pattern, overload warnings and alarms will easily occur. To prevent warnings or alarms from easily occurring, try
extending acceleration/deceleration times or revising the operation pattern. If any problems are caused by the changes made
to the characteristics of overload protection, contact your local sales representative.
Outline
An electronic thermal protection is built in the servo amplifier to protect the servo motor, servo amplifier, and servo motor
power wires from overloads. In this section, overload protection characteristics refer to the overload protection characteristics
of servo amplifiers and servo motors.
Operation exceeding the overload protection characteristics described in this section will cause [AL. 050 Overload 1] or [AL.
051 Overload 2]. Use the equipment within the overload protection level indicated on the left side of the continuous or dotted
lines in the following graphs.
For machines where unbalanced torque occurs, such as a vertical axis system, the unbalanced torque should be kept at 70 %
or lower of the rated torque.
This servo amplifier has a servo motor overload protection function. (The servo motor overload current is set on the basis of
120 % of the rated current (full load current).)
The servo amplifier may malfunction regardless of the electronic thermal protection if torque exceeding 100 % of the rated
torque is generated too frequently while the servo motor is stopped (servo-lock status) or being operated at low speeds of 50
r/min or less.
5 CHARACTERISTICS
170
5.1 Overload protection characteristics