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13. CHARACTERISTICS
13. CHARACTERISTICS
13.1 Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the servo motor and servo amplifier from
overloads. Overload 1 alarm (A50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown in any of Figs 13.1. Overload 2 alarm (A51) occurs if the maximum current flew
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.
In a machine like the one for vertical lift application where unbalanced torque will be produced, it is
recommended to use the machine so that the unbalanced torque is 70% or less of the rated torque.
When you carry out adhesion mounting of the servo amplifier, make circumference temperature into 0 to 45 ,
or use it at 75% or a smaller effective load ratio.
1000
100
During servo lock
10
1
0.1
0
50
100
(Note) Load ratio [%]
a. Electronic thermal relay
protection characteristics1
Note. 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 30r/min or less low-speed operation status, the servo amplifier may fail even when the
electronic thermal relay protection is not activated.
MR-J3-10T (1)
MR-J3-20T (1) MR-J3-40T (1)
MR-J3-60T to MR-J3-100T
MR-J3-200T Mr-J3-350T
MR-J3-500T MR-J3-700T
MR-J3-11KT to MR-J3-22KT
During operation
150
200
250
Fig 13.1 Electronic thermal relay protection characteristics (1/2)
Servo amplifier
1000
100
10
1
0.1
300
0
50
13 - 1
Graph
Fig 12. 1 a
Fig 12. 1 b
Fig 12. 1 c
Fig 12. 1 d
Fig 12. 1 e
During servo lock
100
150
200
(Note) Load ratio [%]
b. Electronic thermal relay
protection characteristics2
During operation
250
300
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