Chapter 5 Characteristics; Overload Protection Characteristics - Mitsubishi Electric 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 262 Characteristics
Page 289 Characteristics
5.1

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.
The actual overload protection level is lower than the electronic thermal protection curve of the servo amplifier and servo
motor used.
[AL. 050 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve shown below.
[AL. 051 Overload 2] occurs if the maximum current is applied continuously for several seconds due to machine collision, etc.
Use the equipment within the overload protection level indicated on the left side of the continuous or dotted lines in the
following graphs.
For the system where the unbalanced torque occurs, such as a vertical axis, the unbalanced torque of the machine 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
115 % rated current (full load current) of the servo amplifier.)
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.
For the overload protection characteristics of the servo motor, refer to "The graph of overload protection characteristics of
rotary servo motor" in the following manual.
Rotary Servo Motor User's Manual (HK series)
Graph of overload protection characteristics of servo amplifiers
■MR-J5-10_
1000
100
10
1
0.1
0 2 4
Output current [Arms]
5 CHARACTERISTICS
94
5.1 Overload protection characteristics
6 8 10