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8. CHARACTERISTICS
8 - 1
8. CHARACTERISTICS
8.1 Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the direct drive motor, servo amplifier and
direct drive motor power line from overloads. Overload 1 alarm (50) occurs if overload operation performed is
above the electronic thermal relay protection curve shown in any of Figs 8.1. 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 close mounting of the servo amplifier, make circumference temperature into 0 to 45
, or
use it at 75
or smaller effective load ratio.
Servo amplifier MR-J3-
B-RJ080W has solid-state direct drive motor overload protection. (The motor full load
current is 115
rated current.)