Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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14 USING A LINEAR SERVO MOTOR
14.4 Characteristics
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14
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.)
a. LM-H3 series
LM-K2 series
b. LM-U2 series
c. LM-F series (natural cooling) d. LM-F series (liquid cooling)
1000
100
10
1
0.1
0 50 150 200 250 300 100
Operation time [s]
Load ratio [%]
Servo-lock
Operating
1000
100
10
1
0.1
0 200 300 400 100
Operation time [s]
Load ratio [%]
Operating
Servo-lock
1000
100
10
1
0.1
0 100 300 400 500 600 200
Operation time [s]
Load ratio [%]
Operating
Servo-lock
1000
100
10
1
0.1
0 50 150 200 250 300 100
Operation time [s]
Load ratio [%]
Operating
Servo-lock