Characteristics; Overload Protection Characteristics - Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual

14. CHARACTERISTICS

14. CHARACTERISTICS

14.1 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 (AL.50) occurs if overload operation performed is above the electronic
thermal relay protection curve shown in any of Figs 14.1. Overload 2 alarm (AL.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.
1000
100
During servo lock
10
1
0.1
0 50
100
(Note) Load ratio [%]
a. MR-J2S-10CP-S084 to MR-J2S-100CP-S084
10000
1000
During servo lock
100
10
1
0 50 100
(Note) Load ratio [%]
c. MR-J2S-500CP-S084 MR-J2S-700CP-S084
Note: If the servo motor is stopped or low-speed (30r/min or less) operation is performed at an abnormally high duty with torque more
than 100% of the rating being generated, the servo amplifier may fail even in a status where the electronic thermal relay protection
is not activated.
During rotation
150 200 250
During rotation
150 200 250
Fig 14.1 Electronic thermal relay protection characteristics
1000
100
10
During servo lock
1
0.1
0 50
300
b. MR-J2S-200CP-S084 to MR-J2S-350CP-S084
300
14 - 1
During rotation
100 150 200
(Note) Load ratio [%]
250 300