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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. The operation characteristics of the electronic thermal relay are shown Fig 11.1 to 11.3.
Overload 1 alarm (50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown below. 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.
(1) MR-J2S-10B to MR-J2S-100B
1000
100
10
1
0.1
0 50 150 200 250 300
HC-KFS series
HC-MFS series
HC-SFS series
HC-UFS series
Load ratio [%]
Operation time[s]
During rotation
During servo lock
100
Fig 11.1 Electronic thermal relay protection characteristics 1
(2) MR-J2S-200B to MR-J2S-350B
1000
100
10
1
0.1
0 50 100 150 200 250 300
HC-SFS series
Load ratio [%]
Operation time [s]
During rotation
During servo lock
HC-RFS series
HC-UFS series
Fig 11.2 Electronic thermal relay protection characteristics 2