Mitsubishi MR-J3-30B Versatile Servo Amplifier: 300W of Reliable Control

The Mitsubishi MR-J3-30B is a flexible and compact 300-watt servo amplifier from the trusted MELSERVO J3 series. Designed for simplicity and efficiency, it operates on both single and three-phase power (200-230VAC) and features a built-in dynamic brake. Its self-cooling, open-type design makes it an excellent choice for a wide range of mid-range automation applications where space and reliable performance are key.

Complete Product Overview

• Brand & Series: Mitsubishi MELSERVO MR-J3 Series
• Model Number: MR-J3-30B
• Amplifier Type: General-Purpose AC Servo Amplifier
• Key Feature: Flexible 1/3-phase input with integrated dynamic brake

Core Technical Specifications

• Rated Output Power: 300 W
• Supply Voltage: 200 to 230 VAC
• Input Phase: 1-Phase or 3-Phase
• Permissible Voltage Range: 170 to 253 VAC
• Input Frequency: 50/60 Hz (±5% fluctuation allowed)
• Control Interface Power: 24 VDC, 150 mA
• Control Method: Sine Wave PWM & Current Control
• Braking: Built-in Dynamic Brake
• Cooling Method: Self-Cooling (Natural Convection)
• Protection Rating: IP00 (Open Chassis)
• Operating Temperature: 0°C to 55°C (non-freezing)
• Storage Temperature: -20°C to 65°C (non-freezing)
• Inrush Current: 30 A

Key Features & Benefits

• Flexible Power Input: Can be wired for either single-phase or three-phase power, simplifying inventory and installation in varied electrical environments.
• Integrated Braking: The built-in dynamic brake handles common deceleration energy, eliminating the need for an external brake resistor in many applications.
• Compact & Simple Cooling: Self-cooling design reduces size, noise, and maintenance by eliminating internal fans.
• Wide Voltage Tolerance: Stable operation from 170V to 253VAC accommodates voltage sags and surges common in industrial settings.
• Proven Control Technology: Utilizes Mitsubishi's precise sine wave PWM and current control for smooth, responsive motor performance.

Typical Applications

This amplifier is well-suited for a broad spectrum of automation tasks:

• Packaging machinery
• Small conveyor systems
• Rotary indexing tables
• Textile machines
• Printing and labeling equipment
• Semiconductor handling units

Compatibility & System Integration

The MR-J3-30B is designed to pair with 300W-rated Mitsubishi HC-KFS, HC-MFS, and HC-SFS series servo motors from the J3 family. It connects to controllers via standard pulse train input or can be integrated into larger systems using optional communication units. Like all IP00 devices, it must be installed inside a protective control cabinet.

Ordering & Service Information

This product is sold as new and original, in factory packaging. It comes with a standard 12-month warranty. We ensure prompt worldwide delivery through our trusted partners: FedEx, UPS, and DHL.

Professional FAQs

When should I use single-phase vs. three-phase wiring for this drive?

Use three-phase input whenever available, as it provides more balanced power and reduces load on the facility's single-phase circuits. Single-phase is suitable for smaller setups or where three-phase power is not accessible.

Does the built-in brake resistor handle all braking needs?

It handles normal, frequent deceleration. For applications with high inertia loads, very fast stop cycles, or vertical axes, you may still need to add an external brake resistor to prevent overload faults.

What is the 24VDC control power used for?

It powers the drive's logic circuits, I/O, and communication interfaces. This must be supplied from a separate, stable 24VDC power source, not from the main AC power line.

Can I use this drive with a Mitsubishi PLC's built-in pulse output?

Yes. The MR-J3-30B accepts standard pulse train signals (CW/CCW or Pulse/Direction), making it directly compatible with the pulse outputs from Mitsubishi FX or Q series PLCs.

What does the 30A inrush current rating mean for my circuit breaker?

It means the drive draws a brief high current at power-on. Your branch circuit protection (breaker or fuse) must be sized to handle this surge without nuisance tripping, typically using a time-delay (slow-blow) fuse.

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