SMC Networks LECSN-T Series User Manual

10. CHARACTERISTICS
10 - 2
10. CHARACTERISTICS
10.1 Overload protection characteristics
An electronic thermal is built in the driver to protect the servo motor, driver and 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. 10.1 [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.
For the system where the unbalanced torque occurs, such as a vertical axis system, the unbalanced torque
of the machine should be kept at 70% or less of the rated torque.
This driver has solid-state servo motor overload protection. (The servo motor overload current (full load
current) is set on the basis of 120% rated current of the driver.)
The following table shows combinations of each servo motor and graph of overload protection
characteristics.
The following graphs show overload protection characteristics.
(Note 1, 2) Load ratio [%]
1000
100
10
1
0.1
100 200 300 350
0
50 150 250
Operating
Servo-lock
Operation time [s]
1000
100
10
1
0.1
100 200 300 4000 50 150 250 350
Load ratio [%]
(Note 1, 2, 3)
Servo-lock
Operating
Operation time [s
]
LECSN
□
-T5
LECSN
□
-T7, LECSN
□
-T8, LECSN2-T9
Note 1.
If operation that generates torque more than 100% of the rating is performed with an abnormally high frequency in a servo
motor stop status (servo-lock status) or in a 50 r/min or less low-speed operation status, the driver may malfunction
regardless of the electronic thermal protection.
2.
The load ratio ranging from 300% to 350% applies to the LE-T
□
-
□
servo motor.
Fig. 10.1 Electronic thermal protection characteristics
Operating

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English