Characteristics; Overload Protection Characteristics - Mitsubishi melservo-j2 series Instruction Manual

13. CHARACTERISTICS

13. CHARACTERISTICS

13.1 Overload Protection Characteristics

An electronic thermal relay is built in the servo amplifier to protect the servo motor and servo amplifier
from overloads. The operation characteristics of the electronic thermal relay are shown below. Overload 1
alarm (A. 50) occurs if overload operation performed is above the electronic thermal relay protection curve
shown below. Overload 2 alarm (A. 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.
(1) MR-J2-10C to MR-J2-100C
a: FH-MF series
1000
HA-FF series
(300W or more)
HC-SF series
HC-UF series
b: HA-FF series
1000
(200W or less)
100
During stop
10
1
0.1
0 50 100
Load ratio [%]
Fig 13.1 Electronic Thermal Relay Protection Characteristics
100
10
During stop
1
0.1
0 50 100
Load ratio [%]
Fig. 13.2 Electronic Thermal Relay Protection Characteristics 2
During rotation
150 200 250
During rotation
150 200 250
13 - 1
300
300