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1. FUNCTIONS AND CONFIGURATION
1. FUNCTIONS AND CONFIGURATION
1.1 Overview
The Mitsubishi general-purpose AC servo MELSERVO-J2M series is an AC servo which has realized
wiring-saving, energy-saving and space-saving in addition to the high performance and high functions of
the MELSERVO-J2-Super series.
The MELSERVO-J2M series consists of an interface unit (abbreviated to the IFU) to be connected with a
positioning unit, drive units (abbreviated to the DRU) for driving and controlling servo motors, and a base
unit (abbreviated to the BU) where these units are installed.
A torque limit is applied to the drive unit by the clamp circuit to protect the main circuit power
transistors from overcurrent caused by abrupt acceleration/deceleration or overload. In addition, the
torque limit value can be changed as desired using the parameter.
The interface unit has an RS-232C or RS-422 serial communication function to allow the parameter
setting, test operation, status indication monitoring, gain adjustment and others of all units to be
performed using a personal computer or like where the MR Configurator (servo configuration software) is
installed. By choosing the station number of the drive unit using the MR Configurator (servo
configuration software), you can select the unit to communicate with, without changing the cabling.
The real-time auto tuning function automatically adjusts the servo gains according to a machine.
A maximum 500kpps high-speed pulse train is used to control the speed and direction of a motor and
execute accurate positioning of 131072 pulses/rev resolution.
The position smoothing function has two different systems to allow you to select the appropriate system
for a machine, achieving a smoother start/stop in response to an abrupt position command.
The MELSERVO-J2M series supports as standard the absolute position encoders which have 131072
pulses/rev resolution, ensuring control as accurate as that of the MELSERVO-J2-Super series. Simply
adding the optional battery unit configures an absolute position detection system. Hence, merely setting a
home position once makes it unnecessary to perform a home position return at power-on, alarm
occurrence or like.
The MELSERVO-J2M series has a control circuit power supply in the interface unit and main circuit
converter and regenerative functions in the base unit to batch-wire the main circuit power input,
regenerative brake connection and control circuit power supply input, achieving wiring-saving.
In the MELSERVO-J2M series, main circuit converter sharing has improved the capacitor regeneration
capability dramatically. Except for the operation pattern where all axes slow down simultaneously, the
capacitor can be used for regeneration. You can save the energy which used to be consumed by the
regenerative brake resistor.
Input signal (Axes 1 to 4)
Regenerative
brake option
Control circuit power
supply input
Main circuit power input
Personal computer connection
Monitor output
Forced stop input
Electromagnetic brake interlock output
Servo motor power cable
Encoder pulse output
extension DIO (Axes 5 to 8)
Encoder cable
Encoder pulse output
extension DIO (Axes 1 to 4)
Extension IO unit
MR-J2M-D01
Input signal (Axes 5 to 8)
Forward rotation stroke end
Reverse rotation stroke end
Forced stop input