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14. USIN G A LINEAR SER VO MOTOR 14 - 31 (3) LM-U2 series (a) LM-U2PBD-15M-1SS0 400 100 200 300 0 0.1 10 1 100 1000 [%] Operation time [s ] Load ratio : Operating : Servo-lock (b) Other than LM-U2PBD-15M-1SS0 0 0.1 10 1 …
14. USING A LINEAR SERVO MOTOR
14 - 30
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.)
(1) LM-H3 series
50 100 150 200 250 3000
0.1
10
1
100
1000
[%]
Operation time [s]
Load ratio
: Operating
: Servo-lock
(2) LM-K2 series
15010050 200 250 3000
0.1
10
1
100
1000
[%]
Operation time [s]
Load ratio
: Operating
: Servo-lock
14. USING A LINEAR SERVO MOTOR
14 - 31
(3) LM-U2 series
(a) LM-U2PBD-15M-1SS0
400100 200 3000
0.1
10
1
100
1000
[%]
Operation time [s]
Load ratio
: Operating
: Servo-lock
(b) Other than LM-U2PBD-15M-1SS0
0
0.1
10
1
100
1000
[%]
100 200 300 400
Load ratio
: Operating
: Servo-lock
Operation time [s]
14. USING A LINEAR SERVO MOTOR
14 - 32
(4) LM-F series (natural cooling)
100 200 300 400 500 6000
0.1
10
1
100
1000
[%]
Load ratio
: Operating
: Servo-lock
Operation time [s]
(5) LM-F series (liquid cooling)
(a) LM-FP2B-06M-1SS0 (liquid cooling)
300150 20050 100 2500
0.1
10
1
100
1000
[%]
Operation time [s]
Load ratio
: Operating
: Servo-lock