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11. CHARACTERISTICS
11. CHARACTERISTICS
11.1 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 (50) occurs if overload operation performed is above the electronic
thermal relay protection curve shown in any of Figs 11.1, Overload 2 alarm (51) 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.
1000
100
10
1
0.1
0
50
150
200
250
300
(Note) Load ratio [%]
Operation time[s]
100
During rotation
During servo lock
a. MR-J2S-10B to MR-J2S-100B
1000
100
10
1
0.1
0
50
150
200
250
300
(Note) Load ratio [%]
Operation time[s]
100
During rotation
During servo lock
b. MR-J2S-200B to MR-J2S-350B
0 50 100
150
200 250
300
1
10
100
1000
10000
(Note) Load ratio [%]
Operation time[s]
During rotation
During servo lock
c. MR-J2S-500B MR-J2S-700B
10000
1000
100
10
1
0 100 200
300
(Note) Load ratio [%]
During rotation
During servo lock
Operation time [s]
d. MR-J2S-11KB to MR-J2S-22KB
Note: If the servo motor is stopped or low-speed (30r/min or less) operation is performed at an abnormally high duty with torque more
than 100% of the rating being generated, the servo amplifier may fail even in a status where the electronic thermal relay protection
is not activated.
Fig 11.1 Electronic thermal relay protection characteristics