Characteristics - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

14.4

Characteristics

Overload protection characteristics
An electronic thermal is built in the servo amplifier to protect the linear servo motor, servo amplifier and linear servo motor
power wires from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve shown in the
following figures. [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.
Use the linear servo motor with 70% or less of the effective load ratio when it is in the servo lock state or in a small
reciprocating motion.
This servo amplifier has linear servo motor overload protection. (The linear servo motor overload current (full load current) is
set on the basis of 120% rated current of the servo amplifier.)
1000
100
10
Servo-lock
1
0.1
0 50 100
Load ratio [%]
a. LM-H3 series
1000
100
10
Servo-lock
1
0.1
0 100 200
Load ratio [%]
c. LM-F series (natural cooling)
Operating
150 200 250 300
LM-K2 series
Operating
300 400 500 600
1000
100
10
Servo-lock
1
0.1
0 100
Load ratio [%]
b. LM-U2 series
1000
100
10
Servo-lock
1
0.1
0 50 100
Load ratio [%]
d. LM-F series (liquid cooling)
14 USING A LINEAR SERVO MOTOR
Operating
200 300 400
Operating
150 200 250 300
14.4 Characteristics
14
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