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13. CHARACTERISTICS
13. CHARACTERISTICS
13.1 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 (A.50) occurs if overload operation performed is above the electronic
thermal relay protection curve shown in any of Figs. 13.1 to 13.3, or overload 2 alarm (A.51) occurs if the
maximum current flows 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-J2-10C to MR-J2-100C
a: FH-MF series
HA-FF series
(300W or more)
HC-SF series
HC-UF series
b: HA-FF series
(200W or less)
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.
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1000
100
During stop
10
1
0.1
0
50
100
(Note) Load ratio [%]
Fig 13.1 Electronic Thermal Relay Protection Characteristics
1000
100
10
During stop
1
0.1
0
50
100
(Note) Load ratio [%]
Fig. 13.2 Electronic Thermal Relay Protection Characteristics 2
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During rotation
150
200
250
300
During rotation
150
200
250
300
13 - 1
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