Mitsubishi MR-J4-350A Servo Amplifier 3.5kW

MR-J4-350A AC Servo Amplifier by Mitsubishi

Product Introduction

The Mitsubishi MR-J4-350A belongs to the MELSERVO-J4 series, a trusted line of motion control products. This digital AC servo amplifier handles one axis with a rated capacity of 3.5 kW. Many engineers choose this drive for its safety features and compact design.

Additionally, the MR-J4-350A supports the STO safety function per IEC/EN 61800-5-2. This feature cuts torque safely during emergency stops. The built-in dynamic brake further improves motion control reliability.

For power requirements, this amplifier uses a 200-240VAC 3-phase input. It also has a control circuit input of single-phase 200-240VAC, 50/60Hz, drawing only 0.2A. Meanwhile, the main circuit delivers a rated current of 17.0A, making it suitable for demanding machines.

Technical Specifications

The Mitsubishi MR-J4-350A uses sinusoidal PWM control with current control method. This setup ensures smooth torque and low vibration. The regenerative power handling reaches up to 100 units, which improves energy efficiency.

Furthermore, it includes a USB interface for easy configuration. You can connect it directly to a PC without special adapters. Compliance with CE, UL/cUL, EAC, and UKCA standards guarantees global acceptance. However, note that this product exceeds REACH limits.

Key dimensions are 90 mm wide, 168 mm tall, and 195 mm deep. This compact size saves cabinet space while delivering full 3.5kW performance.

Mechanical & Environmental Data

The unit weighs 5.44 kg, and it ships with robust packaging. Operating temperature ranges from 0°C to 55°C. Storage temperature goes from -20°C to 65°C. Humidity should stay between 5% and 90% without condensation.

Therefore, installation works well in most factory environments. Vibration resistance is 5.9 m/s² at 10-55 Hz. This meets typical industrial automation requirements.

Installation Guidelines

First, mount the MR-J4-350A vertically on a flat metal panel. Leave at least 10 cm of free space above and below for cooling. Use M4 screws for secure attachment.

Next, connect the 3-phase power supply to terminals L1, L2, and L3. Tighten torque to 1.2 Nm. Then wire the servo motor to U, V, W terminals. Never reverse phase order, as this may damage the unit.

For safety, link the STO inputs to a dual-channel emergency stop circuit. The built-in dynamic brake activates automatically when power is cut. This prevents uncontrolled motor coasting.

Packaging List

• Mitsubishi MR-J4-350A digital AC servo amplifier (1 unit)

• Quick start guide (printed)

• Safety warning sheet

• Connector kit for main circuit

• USB communication cable (1m)

Note: No warranty certificate or compliance documents are included. Those are available separately.

Shipping Information

We ship worldwide using FedEx, UPS, or DHL. Delivery usually takes 3–7 business days. All packages include tracking and industrial-grade foam padding.

Frequently Asked Questions (FAQ)

1. Can I use the MR-J4-350A with a single-phase power supply?
No, this model requires 200-240V 3-phase input for the main circuit. Single-phase input only applies to the control circuit.

2. Does the STO function replace a contactor?
Yes, STO (Safe Torque Off) removes torque without disconnecting power. It meets IEC/EN 61800-5-2 standards. However, use external contactors for mechanical isolation if required.

3. Which servo motors work with the MR-J4-350A?
You can pair it with Mitsubishi HG series motors rated at 3.5kW. For example, HG-SR352 or HG-JR353 models match perfectly.

4. How do I reset the amplifier after an alarm?
First, remove the cause of error. Then send a reset signal via the CN3 interface or cycle the control power. The built-in display shows the alarm code.

5. Is the dynamic brake always active?
The built-in dynamic brake activates only when power is off or during a fault. It does not function as a normal operational brake. For holding position, use an external electromagnetic brake motor.