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14. USING A LINEAR SERVO MOTOR
14 - 29
14.4 Characteristics
14.4.1 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 fig. 14.2. [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 solid-state linear 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.)
1000
100
10
1
0.1
0 50 150 200 250 300100
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
a. LM-H3 series
LM-K2 series
b. LM-U2 series
1000
100
10
1
0.1
0 100 300 400 500 600200
Operation time [s]
Load ratio [%]
Operating
Servo-lock
1000
100
10
1
0.1
0 50 150 200 250 300100
Operation time [s]
Load ratio [%]
Operating
Servo-lock
c. LM-F series (natural cooling) d. LM-F series (liquid cooling)
Fig. 14.2 Electronic thermal protection characteristics