MR-J4-350A | Mitsubishi 3.5kW Servo Amplifier with STO

MR-J4-350A: Mitsubishi Digital AC-Servo Amplifier

MR-J4-350A is a single-axis digital AC-servo amplifier from Mitsubishi. It belongs to the MELSERVO-J4 series. This unit delivers 3.5 kW rated capacity. It ensures safe operation with STO (Safe Torque Off) per IEC/EN 61800-5-2. The amplifier operates on 200-240VAC 3-phase power. It includes a built-in dynamic brake for precise motion control.

Key Features at a Glance

• Safety: STO (Safe Torque Off) complies with IEC/EN 61800-5-2.
• Braking: Built-in dynamic brake for efficient stopping.
• Power: 200-240VAC, 3-phase input.
• Control: Sinusoidal wave PWM with current control system.
• Interface: USB port for easy setup and monitoring.
• Compact: 90 mm width, saves panel space.

Technical Specifications

• Brand: Mitsubishi
• Model: MR-J4-350A
• Series: MELSERVO-J4
• Type: MR-J4
• Rated Capacity: 3.5 kW
• Number of Axes: 1
• Rated Current: 17.0 A
• Power Supply (Main): 200-240 VAC, 3-phase, 50/60 Hz
• Power Supply (Control): 200-240 VAC, single-phase, 0.2 A
• Dynamic Brake: Built-in
• Regenerative Power: Handles up to 100W (standard)
• Control Method: Sinusoidal PWM with current loop
• Communication: USB interface
• Dimensions (W x H x D): 90 x 168 x 195 mm
• Weight: 5.44 kg (12.00 lbs)
• Compliance: CE, UL/cUL, EAC, UKCA
• REACH: Exceeds REACH limit (note for restricted substances)

Measurement & Performance Data

• Measurement Range: Matches compatible servo motors (0.1 to 3.5 kW).
• Frequency Response: Speed loop up to 2.5 kHz.
• Sensitivity: High-resolution 22-bit encoder (4194304 pulses/rev).
• Linearity: Excellent torque linearity across speed range.
• Resolution: 0.01 µm (with compatible motor/encoder).
• Temperature Range: Operates 0°C to 55°C (ambient).
• Environmental Tolerance: IP10 protection, 95% RH max (non-condensing).
• Noise Immunity: Meets EMC directive standards for industrial use.

Installation Guide

• Mount vertically on a metal panel.
• Keep 10 cm clearance top and bottom for cooling.
• Use shielded cables for motor and encoder.
• Follow national electrical codes for wiring.

Commissioning & Maintenance Convenience

• Quick setup via USB and MR Configurator2 software.
• Auto-tuning for one-touch adjustment.
• LED status indicators for diagnostics.
• Easy replacement with pluggable terminals.

Compatibility

• Works with Mitsubishi HG series servo motors (200-240V class).
• Compatible with any Mitsubishi motion controller (Q, L, or R series).
• Supports CC-Link IE Field Basic (optional).

Certifications & Standards

• CE (Europe)
• UL/cUL (North America)
• EAC (Eurasian)
• UKCA (Great Britain)
• STO per IEC/EN 61800-5-2

Package Contents

• MR-J4-350A amplifier unit (1 pc)
• User manual (digital download)
• Power connector kit
• Dynamic brake cover

Warranty & Shipping

• Warranty: 12 months from delivery.
• Shipping: Ships within 12-24 hours after order.
• Carriers: FedEx, UPS, DHL express available.

Expert Review

The MR-J4-350A offers rugged STO safety and a robust dynamic brake. Its 2.5 kHz speed response suits high-performance positioning. The USB interface simplifies tuning. For 3.5 kW single-axis applications, this is a reliable, field-proven choice.

Manager’s Insight

Choose this amplifier for maximum uptime and safety compliance. Built-in dynamic brake reduces external component costs. The REACH limit exceedance is a compliance flag – check local rules before purchase. Otherwise, a top pick for packaging, CNC, and robotics.

Applications & Compatible Equipment

• CNC machines: milling, lathe, router axes
• Packaging systems: cutters, sealers, conveyors
• Robotics: single-axis arms or joint control
• Printing presses: precise web tension control
• Pick-and-place units: high-cycle indexing
• Works with 3300 5mm Proximity Probes for position feedback in harsh environments.

Frequently Asked Questions (FAQ)

• Does this drive support absolute position control?Yes, with an absolute encoder motor and battery backup.
• What happens if the dynamic brake fails?The motor coasts to stop. STO still works as a safe secondary.
• Can I use it on single-phase power?No. Only 3-phase 200-240VAC for main circuit.
• Why does it exceed REACH limit?Some internal components contain restricted substances. Not allowed for EU use after 2026.
• How to choose between MR-J4-350A and MR-J4-350B?Choose A for basic pulse input; choose B for SSCNET III/H network.
• What cable is needed for USB setup?Standard USB Type A to Mini-B cable (not included).
• Is the warranty transferable?No, it covers original buyer only.

Selection Guide

• Match motor power: use with 3.5kW or smaller HG series motor.
• For multi-axis: buy separate MR-J4-350A per axis.
• Need network control? Choose MR-J4-350B instead.
• Use external regenerative resistor for high-inertia loads.

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