Mitsubishi Electric MELSERVO MR-J3 A Series, Instruction Manual

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11 - 1
11. CHARACTERISTICS
11. CHARACTERISTICS
11.1 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 11.1. 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.
When you carry out adhesion mounting of the servo amplifier, make circumference temperature into 0 to 45 ,
or use it at 75% or a smaller effective load ratio.
1000
100
10
1
0.1
0 50 150 200 250 300 100
(Note) Load ratio [%]
O
p
er
at
ion t
ime[
s]
During operation
During servo lock
MR-J3-10A (1)
1000
100
10
1
0.1
0 50 150 200 250 300 100
(Note) Load ratio [%]
O
perat
io
n
ti
m
e
[s
]
During operation
During servo lock
MR-J3-20A (1) MR-J3-40A (1)
MR-J3-60A to MR-J3-100A (4)
1000
100
10
1
0.1
0 50 150 200 250 300 100
(Note) Load ratio [%]
O
p
er
at
ion t
ime[
s]
During operation
During servo lock
MR-J3-200A (4) MR-J3-350A (4)
(Note) Load ratio [%]
Operat
io
n
ti
m
e
[s
]
10000
1000
100
10
1
0 50 150 200 250 100 300
During operation
During servo lock
MR-J3-500A (4) MR-J3-700A (4)