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10. CHARACTERISTICS
10. CHARACTERISTICS
10.1 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 10.1, 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
During stop
10
1
0.1
0
50
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. 10.1 Electronic thermal relay protection characteristics
During rotation
100
150
200
(Note) Load ratio [%]
10 - 1
250
300
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