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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 below. Overload 1
alarm (A. 50) occurs if overload operation performed is above the electronic thermal relay protection curve
shown below. Overload 2 alarm (A. 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.
When you carry out adhesion mounting of the servo amplifier, make circumference temperature into 0 to
45°C, or use it at 75% or a smaller effective load ratio.
1000
100
10
1
0.1
0 50 150 200 250 300
(Note) Load ratio [%]
100
During stop
During rotation
Operation time [s]
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.
Fig 11.1 Electronic Thermal Relay Protection Characteristics