Characteristics - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

15.4

Characteristics

Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the servo amplifier, the direct drive motor, and direct drive
motor power wires from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal relay protection curve shown in the
following figures. [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.
When unbalanced torque is generated, such as in a vertical lift machine, the unbalanced torque of the machine should be kept
at 70% or lower of the motor's rated torque.
This servo amplifier has solid-state direct drive motor overload protection for each axis. (The direct drive motor overload
current (full load current) is set on the basis of 120% rated current of the servo amplifier.)
1000
100
10
1
0.1
0 50
TM-RFM002C20/TM-RFM004C20/
TM-RFM006C20/TM-RFM006E20/
TM-RFM012E20/TM-RFM018E20/
TM-RFM012G20/TM-RFM040J10
10000
1000
Servo-lock
100
10
1
0 50
*1 If operation that generates torque more than 100% of the rating is performed with an abnormally high frequency in a direct drive motor
stop status (servo-lock status) or in a 50 r/min or less low-speed operation status, the servo amplifier may malfunction regardless of the
electronic thermal relay protection.
15 USING A DIRECT DRIVE MOTOR
508
15.4 Characteristics
Servo-lock
100 150 200 250
Load ratio [%] *1
Operating
100 150 200 250
Load ratio [%] *1
TM-RFM240J10
1000
Operating
100
10
1
0.1
300 0
1000
100
10
1
0.1
300
0
Servo-lock
50 100 150 200
Load ratio [%] *1
TM-RFM048G20/TM-RFM072G20/
TM-RFM120J10
Servo-lock
50 100 150 200
Load ratio [%] *1
TM-RG2M002C30/TM-RU2M002C30/
TM-RG2M004E30/TM-RU2M004E30/
TM-RG2M009G30/TM-RU2M009G30
Operating
250 300
Operating
250 300 350