Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

Page: 788 / 802

App. - 33
APPENDIX
(6) Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the servo motor, servo amplifier and
servo motor power line from overloads. The operation characteristics of the electronic thermal relay are
shown below. It is recommended to use an unbalanced torque-generated machine, such as a vertical
motion shaft, so that unbalanced torque is not more than 70% of the rated torque. When you carry out
adhesion mounting of the servo amplifier, make circumference temperature into 0 to 45°C (32 to 113°F) or
use it with 75% or less of effective load torque.
Servo amplifier MR-J3 series have servo motor overload protection. (The motor full load current is 115%
rated current.)
1000
100
10
1
0.1
100 200 300 350 0
O
pe
ra
tio
n
tim
e
[s
]
(Note 1) Load ratio [%]
50 150 250
Servo-lock
Operation
1000
100
10
1
0. 1
100 200 300 400 0 50 150 250 350
(Note 1, 2) Load ratio [%]
Servo-lock
Operation
O
p
e
ra
tio
n
ti
m
e
[s
]
1000
100
10
1
0.1
100 200 300 400 0 50 150 250 350
O
p
er
a
tio
n
ti
m
e
[
s]
Servo-lock
Operation
(Note 2) Load ratio [ %]
MR-J3-10T(1) MR-J3-20T(1) MR-J3-40T(1)
MR-J3-60T(4) MR-J3-100T(4)
MR-J3-200TN 200T4 350T(4)
1000
100
10
1
0. 1
100 200 300 400 0 50 150 250 350
(Note 2) Load ratio [ %]
Servo-lock
Operation
O
pe
ra
tio
n
tim
e
[s
]
1
0
10000
1000
100
10
50 100 150 200 250 300
(Note 2) Load ratio [%]
Servo-lock
Operat
ion t
im
e [
s]
Operation
MR-J3-500T(4) MR-J3-700T(4) MR-J3-11KT(4) MR-J3-22KT(4)
Note 1. The operation time at the load ratio of 300 to 350% applies when the maximum torque of HF-KP servo motor is increased to 350%.
2. The operation time at the load ratio of 300 to 400% applies when the maximum torque of HF-JP servo motor is increased to 400%.