Chapter 7 Characteristics; Overload Protection Characteristics - Mitsubishi Electric Melservo-J4 MR-J4-DU*B4-RJ100 Series Instruction Manual

7
CHARACTERISTICS
The following items are the same as those for MR-J4-_B_(-RJ). Refer to the section of the detailed explanation field for
details. "MR-J4-_B_" means "MR-J4-_B_(-RJ) Servo Amplifier Instruction Manual".
Item
Cable bending life
7.1

Overload protection characteristics

This section describes MR-J4-DU_B4-RJ100 drive units only. MR-CV55K4 power regeneration converter
units, refer to section 3.5 in "MR-CV_/MR-CR55K_/MR-J4-DU_(-RJ) Instruction Manual".
An electronic thermal is built in the drive unit to protect the servo motor, drive unit, and servo motor power wires from
overloads. [AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve shown
in the following figure. [AL. 51 Overload 2] occurs if the maximum current is applied continuously for several seconds due to
machine collision, etc. Use the equipment on the left-side area of the continuous or broken line in the graph.
For the system where the unbalanced torque occurs, such as a vertical axis, it is recommended that the unbalanced torque of
the machine be kept at 70% or lower of the motor's rated torque.
The drive unit has the servo motor overload protective function. (The servo motor overload current (full load current) is set on
the basis of 120% rated current of the drive unit.)
1000
100
Servo-lock
10
1
0.1
0 100
*1 This graph shows electronic thermal protection characteristics for a load ratio of up to 456%. For the maximum load ratio, refer to
maximum currents in "Servo Motor Instruction Manual (Vol. 3)".
Operating
200 300
Load ratio [%]
*1
HG-JR110K24W0C
HG-JR150K24W0C
HG-JR180K24W0C
HG-JR200K24W0C
HG-JR220K24W0C
Detailed explanation
MR-J4-_B_ section 10.4
400
7.1 Overload protection characteristics
7 CHARACTERISTICS
55
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