Specifications

9.CHARACTERISTICS
9– 2
9-1 Overload protection characteristics
1000
100
10
1
0.1
0 50 150 200 250 300
1000
100
10
1
0.1
0 50 100 150 200 250 300
a: HC-MF series
HA-FF series
(300W or more)
HC-SF series
HC-RF series
b: HA-FF series
(200W or less)
Load ratio [%]
Load ratio [%]
Operation time [s]
During stop
During rotation
Operation time [s]
During stop
During rotation
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 cur-
rent 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—J2—10A to MR—J2—100A