Characteristics; Overload Protection Characteristics - Mitsubishi Electric MELSERVO-J3 Series Manual

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 (A50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown in any of Figs 13.1. Overload 2 alarm (A51) 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.
When you carry out adhesion mounting of the servo amplifier, make circumference temperature into 0 to 45
(32 to 113 ), or use it at 75% or smaller effective load ratio.
1000
100
During servo lock
10
1
0.1
0 50 100
(Note) Load ratio [%]
MR-J3-10T(1)
1000
100
During servo lock
10
1
0.1
0 50 100
(Note) Load ratio [%]
MR-J3-200T(4) MR-J3-350T(4)
During operation
150 200 250
During operation
150 200 250
1000
100
10
1
0.1
300
0 50
MR-J3-20T(1) MR-J3-40T(1)
MR-J3-60T(4) to MR-J3-100T(4)
10000
1000
During servo lock
100
10
1
300
0 50
MR-J3-500T(4) MR-J3-700T(4)
13 - 1
During operation
During servo lock
100 150 200
(Note) Load ratio [%]
During operation
100 150 200
(Note) Load ratio [%]
250 300
250 300