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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.
MR-J4-_B_ servo amplifier is connected to controllers, including a servo system controller, on the high-
speed synchronous network SSCNET III/H. The servo amplifier directly receives a command from a
controller to drive a servo motor.
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 MELSERVO-J3 series.
MR-J4-_B_ servo amplifier operates MELSERVO-J4 series compatible rotary servo motors, linear servo
motors, and direct drive motors as standard.
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.
SSCNET III/H achieves high-speed communication of 150 Mbps full duplex with high noise immunity due to
the SSCNET III optical cables. Large amounts of data are exchanged in real-time between the controller and
the servo amplifier. Servo monitor information is stored in the upper information system and is used for
control.
On the SSCNET III/H network, the stations are connected with a maximum distance of 100 m between them.
This allows you to create a large system.
The MR-J4-_B_ servo amplifier supports the Safe Torque Off (STO) function. When the MR-J4W_-B servo
amplifier is connected to a SSCNET III/H-compatible servo system controller, in addition to the STO function,
the servo amplifier also supports the Safe Stop 1 (SS1), Safe Stop 2 (SS2), Safe Operating Stop (SOS),
Safely-Limited Speed (SLS), Safe Brake Control (SBC), and Safe Speed Monitor (SSM) functions.
The MR-J4W_-B 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 MELSERVO-J4 series, servo amplifiers with CN2L connector is also available as MR-J4-_B_-RJ. By using
CN2L connector, an A/B/Z-phase differential output method 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 MR-J4-_B_ and
MR-J4-_B_-RJ servo amplifiers.