Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 285

Part 6: Review on Replacement of MR-J3-_T_(DIO command/ Serial communication operation) with MR-J4-_A_-RJ
(2) Separate repair of servo amplifiers and servo motors
POINT
MR-J3-_T_(DIO command/Serial communication operation) cannot drive an HG
motor. When the servo motor is replaced withan HG motor, simultaneous
replacement with MR-J4-_A_-RJ and an HG motor isnecessary.
If the existing system is any of the combinations in the following table, it is
recommended to replace both the servo amplifier and servo motor with an MR-
J4-_A_-RJ and HG motor at the same time. When an HG motor is adopted, the
capacity of the servo amplifier needs to be changed. (Consider replacement,
referring to "torque characteristics" described in "Part 8: Replacement of
Motor".)
The low inertia "HG-JR motor" is recommended for the replacement of "HC-LP
motor". To use a servo motor other than the motors listed in following table,
check the compatibility with the equipment because the motor inertia, etc. is
different.
Existing device models
Servo motor
HC-RP103(B)G5 1/_ MR-J3-200T
HC-RP203(B)G5 1/_ MR-J3-350T
HC-RP353(B)G5 1/_ MR-J3-500T
HC-RP103(B)G7 1/_ MR-J3-200T
HC-RP203(B)G7 1/_ MR-J3-350T
HC-RP353(B)G7 1/_ MR-J3-500T
HC-LP52(B) MR-J3-60T
HC-LP102(B) MR-J3-100T
HC-LP152(B) MR-J3-200T
Replacement models for simultaneous
Servo amplifier Servo motor
HG-SR102(B)G5 1/_
HG-SR202(B)G5 1/_
HG-SR352(B)G5 1/_
HG-SR102(B)G7 1/_
HG-SR202(B)G7 1/_
HG-SR352(B)G7 1/_
HG-JR73(B)
HG-JR153(B)
HG-JR353(B)
6 - 6
replacement (example)
Servo amplifier
MR-J4-100A-RJ
MR-J4-200A-RJ
MR-J4-350A-RJ
MR-J4-100A-RJ
MR-J4-200A-RJ
MR-J4-350A-RJ
MR-J4-70A-RJ
MR-J4-200A-RJ
MR-J4-350A-RJ