
14. USING A LINEAR SERVO MOTOR
14 - 26
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-hand side area of the continuous or
broken line in the graph.
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.)
50 100 150 200 250 3000
10
1
100
1000
േ
ᤨ
㑆
[s]
⽶⩄₸
[%]
ࠨࡏࡠ࠶ࠢᤨ
ㆇォᤨ
0
10
1
100
1000
േ
ᤨ
㑆
[s]
⽶⩄₸
[%]
100 200 300 400
ࠨࡏࡠ࠶ࠢᤨ
ㆇォᤨ
a. LM-H3 series
LM-K2 series
b. LM-U2 series
ࠨࡏࡠ࠶ࠢᤨ
ㆇォᤨ
േ
ᤨ
㑆
[s]
⽶⩄₸
[%]
ࠨࡏࡠ࠶ࠢᤨ
ㆇォᤨ
േ
ᤨ
㑆
[s]
⽶⩄₸
[%]
c. LM-F (natural cooling) d. LM-F (liquid cooling)
Fig. 14.2 Electronic thermal protection characteristics
Operation time [s]
Servo-lock
Operating
Operation time [s]
Load ratio [%]
Load ratio [%]
Servo-lock
Operating
Operating
Servo-lock
Load ratio [%]
Load ratio [%]
Servo-lock
Operating
Operation time [s]
Operation time [s]
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