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10. CHARACTERISTICS
10. CHARACTERISTICS
10.1 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 (50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown in any of Figs 10.1. Overload 2 alarm (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.
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
,
or use it at 75% or smaller effective load ratio.
1000
100
10
1
0.1
0 50 150 200 250 300100
(Note) Load ratio [%]
Operation time[s]
During operation
During servo lock
MR-J3-10B(1)
1000
100
10
1
0.1
0 50 150 200 250 300100
(Note) Load ratio [%]
Operation time[s]
During operation
During servo lock
MR-J3-20B(1) MR-J3-40B(1)
MR-J3-60B(4) to MR-J3-100B(4)
1000
100
10
1
0.1
0 50 150 200 250 300
100
(Note) Load ratio [%]
Operation time[s]
During operation
During servo lock
MR-J3-200B(4) to MR-J3-350B(4)
(Note) Load ratio [%]
Operation time[s]
10000
1000
100
10
1
0 50 150 200 250100 300
During operation
During servo lock
MR-J3-500B(4) MR-J3-700B(4)