1. FUNCTIONS AND CONFIGURATION
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1. FUNCTIONS AND CONFIGURATION
1.1 Summary
The Mitsubishi MELSERVO-J4 series general-purpose AC servo has further higher performance and higher
functions compared to the previous MELSERVO-J3 series.
The MELSERVO-J4 series compatible rotary servo motor is equipped with 22-bit (4194304 pulses/rev) high-
resolution absolute encoder. In addition, speed frequency response is increased to 2.5 kHz. Thus, faster and
more accurate control is enabled as compared to the MELSERVO-J3 series.
The servo amplifier has position, speed, and torque control modes. In the position control mode, the
maximum pulse train of 4 Mpulses/s is supported. Further, it can perform operation with the control modes
switched, e.g. position/speed control, speed/torque control and torque/position control. Hence, it is
applicable to a wide range of fields, not only precision positioning and smooth speed control of machine tools
and general industrial machines but also line control and tension control.
With one-touch tuning and real-time auto tuning, you can automatically adjust the servo gains according to
the machine.
The tough drive function and the drive recorder function, which are well-received in the MELSERVO-JN
series, have been improved. The MR-J4 servo amplifier supports the improved functions. Additionally, the
preventive maintenance support function detects an error in the machine parts. This function provides strong
support for the machine maintenance and inspection.
The MR-J4-_A_ servo amplifier supports the Safe Torque Off (STO) function. By combining with optional
MR-J3-D05, the servo amplifier supports Safe stop 1 (SS1) function.
The servo amplifier has a USB communication interface. Therefore, you can connect the servo amplifier to
the personal computer with MR Configurator2 installed to perform the parameter setting, test operation, gain
adjustment, and others.
In the MELSERVO-J4 series, servo amplifiers with the CN2L connector are also available as MR-J4-_A_-RJ.
By using the CN2L connector, an A/B/Z-phase differential output type external encoder can be connected to
the servo amplifier. In a fully closed loop system, a four-wire type external encoder is connectable as well.
The following table indicates the communication method of the external encoder compatible with the MR-J4-
_A_ and MR-J4-_A_-RJ servo amplifiers.
Table 1.1 Connectors to connect from external encoders
Connector
Operation
mode
External encoder
communication
method
MR-J4-_A_ MR-J4-_A_-RJ
Two-wire type
Four-wire type
CN2
(Note 1, 4)
CN2
(Note 1)
Linear servo
motor system
A/B/Z-phase
differential output type
CN2L
(Note 5)
Two-wire type
CN2
(Note 2, 3, 4)
Four-wire type
Fully closed
loop system
A/B/Z-phase
differential output type
CN2L
Note 1. The MR-J4THCBL03M branch cable is necessary.
2. The MR-J4FCCBL03M branch cable is necessary.
3. When the communication method of the servo motor encoder is four-wire type,
MR-J4-_A_ cannot be used. Use an MR-J4-_A_-RJ.
4. This is used with software version A5 or later.
5. Connect a thermistor to CN2.
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