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App. - 22
A
PPENDI
X
(10) Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the servo motor, servo amplifier and
servo motor power line from overloads. The operation characteristics of the electronic thermal relay are
shown below. It is recommended to use an unbalanced torque-generated machine, such as a vertical
motion shaft, so that unbalanced torque is not more than 70
of the rated torque. When you carry out
adhesion mounting of the servo amplifier, make circumference temperature into 0 to 45
(32 to 113 ) or
use it with 75
or less of effective load torque.
Servo amplifier MR-J3 series have servo motor overload protection. (The motor full load current is 115
rated current.)
1000
100
10
1
0.1
100 200 300 350
0
(Note 2) Load ratio [ ]
In servo lock
In operation
Operation time [s]
1000
100
10
1
0.1
100 200 300 350
0
In servo lock
In operation
Operation time [s]
(Note 2) Load ratio [ ]
1000
100
10
0.1
0200300100
1
In operation
In servo lock
Load ratio [ ]
Operation time [s]
MR-J3-10A(1) MR-J3-20A(1) MR-J3-40A(1)
MR-J3-60A(4) to MR-J3-100A(4)
MR-J3-200A(4) MR-J3-350A(4)
10000
1000
100
10
1
0200100
300
In operation
In servo lock
Load ratio [ ]
Operation time [s]
10000
1000
100
10
1
0200100
300
In operation
In servo lock
Load ratio [ ]
Operation time [s]
10000
1000
100
10
1
0200250100
In operation
(Note 1) In servo lock
Load ratio [ ]
Operation time [s]
MR-J3-500A(4) MR-J3-700A(4) MR-J3-11KA(4) to MR-J3-22KA(4) MR-J3-DU30KA(4)
MR-J3-DU37KA(4)
MR-J3-DU54KA4
MR-J3-DU55KA4
Converter unit MR-J3-CR55KA(4)
Note 1. The thermal relay protection characteristics for servo lock are not applied to MR-J3-CR55K(4).
2. The operation time at the load ratio of 300 to 350
applies when the maximum torque of HF-KP servo motor is increased to 350 .