Overload Protection Characteristics - Mitsubishi Electric MELSERVO-J4 series Instruction Manual

10. CHARACTERISTICS
10. CHARACTERISTICS

10.1 Overload protection characteristics

An electronic thermal is built in the servo amplifier to protect the servo motor, servo amplifier 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 fig. 10.1 [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-hand side area of the continuous or
broken line in the graph.
When unbalanced torque is generated, such as in a vertical lift machine, it is recommended that the
unbalanced torque of the machine be kept at 70% or less of the motor's rated torque.
This servo amplifier has solid-state servo motor overload protection. (The servo motor overload current (full
load current) is set on the basis of 120% rated current of the servo amplifier.)
The following table shows combinations of each servo motor and graph of overload protection
characteristics.
HG-KR HG-MR
053 053
13 13
23 23
43 43
73 73
POINT
For the characteristics of the linear servo motor and the direct drive motor, refer
to sections 14.4 and 15.4.
Rotary servo motor
HG-SR HG-UR
72
51
81
52
102
121 152
201 202
152
202
301
352
421 352
502 502
702
524
1024
1524
2024
3524
5024
7024
HG-RR HG-JR (When the maximum
53 53
73
103
103 153 73
153 203 103
203 353 153
203
353 503 353
503 703 503
903
11K1M
15K1M
22K1M
534 534
734
1034
1534 734
2034 1034
3534 1534
2034
5034 3534
7034 5034
9034
11K1M4
15K1M4
22K1M4
10 - 1
Graph of overload
HG-JR
protection
characteristics
torque is 400%)
Characteristics a
Characteristics b
Characteristics c
Characteristics d
Characteristics e
Characteristics b
Characteristics c
Characteristics d
Characteristics e