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12. CHARACTERISTICS
12. CHARACTERISTICS
12.1 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 below. Overload 1
alarm (AL.50) occurs if overload operation performed is above the electronic thermal relay protection
curve shown below. Overload 2 alarm (AL.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-10A to MR-J2S-100A
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 stop
100
Fig 12.1 Electronic thermal relay protection characteristics 1
(2) MR-J2S-200A to MR-J2S-350A
1000
100
10
1
0.1
0 50 100 150 200 250 300
HC-SFS series
Load ratio [%]
Operation time [s]
During rotation
During stop
HC-RFS series
HC-UFS series
Fig 12.2 Electronic thermal relay protection characteristics 2