Mitsubishi MR-J3-700A4 Servo Amplifier: High-Voltage Power for Industrial Demands

This is the Mitsubishi MR-J3-700A4, a robust servo amplifier designed for high-voltage industrial applications. Part of the reliable MELSERVO MR-J3 series, the MR-J3-700A4 delivers a rated 17A current and operates on 380-480VAC power, making it ideal for driving large motors in demanding environments.

Engineered for High-Power Applications

• High Voltage Ready: Designed for 3-phase 380-480VAC industrial power supplies.
• Robust Output: Provides 17A rated current for driving powerful servo motors.
• Advanced Control: Uses sine-wave PWM and current control for precision and smooth operation.
• Built-in Safety: Integrated dynamic brake ensures safe and controlled motor deceleration.
• Force-Cooled Reliability: Open structure with forced cooling maintains performance under continuous high load.

Detailed Technical Specifications

• Manufacturer & Series: Mitsubishi Electric, MELSERVO MR-J3 Series.
• Model: MR-J3-700A4 Servo Amplifier.
• Rated Output Power: 7.0 kW.
• Rated Output Current: 17 A.
• Rated Output Voltage: 3-phase, 323VAC.
• Main Circuit Power: 3-phase, 380-480VAC, 50/60Hz.
• Main Circuit Input Current: 14.4 A.
• Control Circuit Power: 1-phase, 380-480VAC, 50/60Hz, 45W.
• Interface Power: 24VDC (for internal logic and I/O).
• Control Method: Sine-wave PWM control, current control system.
• Communication Interface: SSCNET III fiber optic interface (standard for this series).
• Brake Unit: Built-in dynamic brake.
• Cooling Method: Force-cooling.
• Enclosure Rating: IP00 (Open chassis, requires protective panel).
• Operating Temperature: 0°C to +55°C.
• Weight: 6.2 kg.
• Compatible Motors: Mitsubishi HF-SP, HA-LP, and other high-power 400V-class MR-J3 servo motors.

Warranty Assurance

We guarantee product quality and performance. This amplifier is covered by a reliable 12-month warranty against any defects in materials or manufacturing.

Global Delivery Options

We ship internationally using our trusted courier partners: FedEx, UPS, and DHL. Tracking information is provided for all shipments.

Frequently Asked Questions (FAQ)

What type of applications typically use this high-voltage amplifier?

The MR-J3-700A4 is suited for heavy-duty machinery. Common applications include large metal forming presses, industrial extruders, heavy-duty CNC machining centers, and large material handling systems that operate on 400V-class power.

What is the significance of the 323VAC rated output voltage?

This is the typical voltage supplied to the motor under normal operation when the main input is at 400VAC. It reflects the internal voltage conversion of the amplifier and is crucial for correctly matching with a 400V-class servo motor.

Does this model support direct network communication like EtherCAT?

The standard interface for the MR-J3-700A4 model is SSCNET III fiber optics. For EtherCAT communication, you would need to select a specific EtherCAT model variant from the MR-J3 series (e.g., MR-J3-350A-ETHERCAT).

How important is the forced cooling feature?

For a 7kW amplifier, forced cooling is essential. It uses an internal fan to actively remove heat generated by the power transistors. This allows the amplifier to maintain its rated output current continuously in a typical industrial cabinet environment.

What are the key electrical safety checks before powering it on?

Always verify: 1) Main power voltage matches the 380-480VAC range, 2) The protective earth (ground) connection is secure, 3) The correct fuses or circuit breakers are installed on the power input lines, and 4) All motor and encoder connections are tight and correct.

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