Mitsubishi MR-J3-15KA-LR Servo Amplifier: High-Power Precision with Serial Control

This is the Mitsubishi MR-J3-15KA-LR, a high-power 15kW servo amplifier from the versatile MELSERVO MR-J3 series. The MR-J3-15KA-LR is engineered for applications requiring substantial torque and precise positioning, offering robust performance through its RS-422 serial communication interface.

Engineered for Power and Precision

• High Power Output: Delivers a substantial 15 kW rated output with an 87A current rating for heavy loads.
• Exceptional Resolution: Supports 262,144 pulses/revolution for ultra-fine positioning accuracy.
• Robust Control: Utilizes sine-wave PWM and current control for smooth, responsive motor operation.
• Direct Communication: Features an RS-422 serial interface for reliable command and feedback.
• External Braking: Designed for use with an external dynamic brake unit for controlled, high-power deceleration.

Complete Technical Specifications

• Brand & Series: Mitsubishi Electric, MELSERVO MR-J3 Series.
• Model: MR-J3-15KA-LR Servo Amplifier.
• Rated Output: 15.0 kW.
• Rated Current: 87 A.
• Supply Voltage: 3-phase, 200-230VAC, 50/60Hz.
• Input Current: 64 A.
• Positioning Resolution: 262,144 pulses/revolution (18-bit equivalent).
• Control Method: Sine-wave PWM control, current control.
• Communication Interface: RS-422 (serial communication).
• Brake Unit: Requires external dynamic brake unit (model specific).
• Control Power Consumption: 45 W.
• Interface Power: 24VDC.
• Cooling Method: Forced ventilation (standard for this power class).
• Operating Temperature: 0°C to +55°C (non-freezing).
• Storage Temperature: -20°C to +65°C.
• Compatible Motors: Mitsubishi HF-SP, HA-LP, and other high-power 200V-class MR-J3 compatible servo motors.

Warranty Information

We guarantee the quality of our products. This amplifier comes with a 12-month warranty covering manufacturing defects.

Global Shipping

We ship worldwide using reliable carriers: FedEx, UPS, and DHL. Tracking is provided for all shipments.

Frequently Asked Questions (FAQ)

What types of applications require a 15kW servo amplifier?

The MR-J3-15KA-LR is suited for large, powerful machinery. Typical uses include large injection molding machines, heavy-duty press feeds, large material handling cranes, and industrial centrifuges where high torque at medium speeds is critical.

Why does this model require an external dynamic brake unit?

At 15kW, the amount of regenerative energy produced during deceleration is very high. An external brake unit with a large resistor bank is necessary to safely dissipate this heat outside the control cabinet, preventing overheating and ensuring reliable stopping performance.

How does RS-422 control handle such a high-power drive?

The RS-422 interface handles the command signals and parameter communication. The actual high-power switching for the motor is handled internally by the amplifier's robust IGBT circuits. RS-422 provides a stable, noise-immune connection for control, which is sufficient for many standalone or point-to-point high-power applications.

What is the practical meaning of 262,144 pulses/revolution?

This high resolution means the controller can address over a quarter-million distinct positions within one motor revolution. This allows for extremely fine control of positioning, critical in applications like precision machining, winding, or printing where minute movements matter.

What are key installation requirements for this amplifier?

Installation requires: a high-current 3-phase power supply with appropriate fusing, heavy-gauge wiring, adequate cabinet space for heat dissipation (forced cooling), proper mounting of the external brake resistor in a ventilated area, and correct grounding for safety and noise immunity.

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