Mitsubishi Electric MR-J4W2-44B MELSERVO-J4 Series 2-Axis Servo Amplifier

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Manufacturer: Mitsubishi Electric
Product No.: MR-J4W2-44B
Country of origin:United States
Product Type: Servo Amplifiers
Payment: T/T, Western Union
Weight: 1400g
Dimensions: 195 mm x 60 mm x 168 mm
Shipping port: Xiamen
Warranty: 12 months

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Description

Designed to execute synchronized multi-axis control within a single space-saving envelope, the Mitsubishi Electric MR-J4W2-44B is a dual-axis digital AC servo amplifier operating on the MELSERVO-J4 platform. By consolidating control electronics for two independent 0.4 kW axes, this unit significantly reduces control panel footprints, optimizes power distribution, and streamlines network routing. The integration of high-speed SSCNET III/H optical fiber communications enables high-resolution motion synchronization with negligible electromagnetic interference, making it an ideal choice for high-speed, multi-axis automated assemblies.

Features

Dual-Axis Integration: Drives two independent rotary or linear servo motors up to 0.4 kW each, cutting cabinet space requirements by up to 30 percent.
SSCNET III/H Protocol: High-speed optical bus operating at 150 Mbps for precise, deterministic synchronized control with complete noise immunity.
Advanced Vibration Suppression Control II: Dynamically compensates for mechanical resonance in both high-frequency structural elements and low-frequency load oscillation.
One-Touch Tuning: Real-time estimation of mechanical inertia ratio enables instantaneous auto-tuning of servo gains.
Functional Safety Support: Integrated Safe Torque Off (STO) functions compliant with international safety standards.

Applications

Synchronized multi-axis packaging machinery and cartoning lines.
High-speed pick-and-place gantry robots and semiconductor assembly systems.
Precise X-Y positioning tables and material handling conveyors.
Automated winding, indexing, and labeling machinery.

Technical Specifications Table

Manufacturer	Mitsubishi Electric
Model Number	MR-J4W2-44B
Series Name	MELSERVO-J4 (MR-J4)
Controlled Axes	2 Axes (Axis A and Axis B)
Rated Output Power	0.4 kW per axis (Total 0.8 kW)
Communication Interface	SSCNET III/H (Optical connection)
Main Circuit Power Supply	3-phase 200 to 240 VAC, 50/60 Hz
Control Circuit Power Supply	1-phase 200 to 240 VAC, 50/60 Hz
Encoder Compatibility	22-bit absolute/incremental systems
Cooling Method	Natural cooling
Ambient Operating Temperature	0 to 55 degC (non-freezing)
Dimensions (H x W x D)	195 mm x 60 mm x 168 mm
Net Weight	1.4 kg
Shipping Weight (Calculated)	3.5 kg

Connections and Interfaces

Terminal / Connector Code	Functional Assignment
L1 / L2 / L3	Main circuit power supply input (200-240 VAC)
L11 / L21	Control circuit power supply input
U / V / W (Axis A)	Servo motor output terminals for Axis A
U / V / W (Axis B)	Servo motor output terminals for Axis B
CN1A / CN1B	SSCNET III/H optical fiber loop connectors (In/Out)
CN2A / CN2B	Encoder connection interfaces for Axis A / Axis B
CN8	Functional safety signal connector (STO)

Alternative Models & Compatibility

The MR-J4W2 series is designed as the primary platform for multi-axis configurations within the MR-J4 ecosystem. Note that when migrating legacy MR-J3W units to the MR-J4W2 configuration, parameter translation within the programming suite (such as GX Works2 or GX Works3) is required. While physical mounting footprints differ slightly from single-axis units, the space gains from eliminating independent control power cabling easily justify the transition.

Application Pitfalls & Engineering Notes

Because both Axis A and Axis B share a common internal DC bus, regenerative energy from decelerating one axis is naturally utilized by the second motoring axis. However, if both axes undergo simultaneous high-inertia deceleration, the regenerative capacity can quickly saturate the internal capacitor, triggering an Overvoltage (AL.33) fault. For operations with continuous regenerative cycles or high load inertia, always calculate total system regeneration requirements and connect an appropriately sized external regeneration resistor across the L+ and L- terminals.

Commissioning & Wiring Tips

When laying the SSCNET III/H optical fiber cables (MR-J3BUS_M), do not violate the minimum bend radius of 25 mm. Sharp bends or excessive zip-tie tension on the fiber optic routing will attenuate the light signal, leading to random line failures (AL.37) or communication errors (AL.E6). Always cap unused optical ports on the amplifier to prevent dust and humidity contamination of the optical transceiver lens.

Installation Guidelines

CRITICAL WARNING:

Risk of electric shock and residual charge discharge. Always disconnect the main circuit and control circuit power supplies before beginning physical installation or wiring. Wait at least 15 minutes after power-down for the internal charge lamps on the front face of the amplifier to completely extinguish before handling cable connections.

Mount the servo amplifier vertically on a flat, unpainted metallic surface to guarantee low impedance grounding and maximize thermal heat transfer.

Ensure a clear spacing of at least 40 mm above and below the housing, and at least 10 mm on either side of the chassis to allow unobstructed airflow.

Connect the protective earth (PE) terminal to the cabinet grounding panel before connecting any input power phases or encoder cables.

Key Features:

#Melservo-J4 #Servo Amplifiers

Can this amplifier run asymmetric motor capacities on Axis A and Axis B?

Yes. Each axis is rated independently up to 0.4 kW. You can connect motors of unequal capacities (e.g., a 100 W motor on Axis A and a 400 W motor on Axis B) as long as neither axis exceeds the 0.4 kW rated threshold.

What is the key advantage of the shared DC bus on this dual-axis unit?

The shared internal DC bus allows energy generated during deceleration on one axis to be direct-fed to the other axis if it is accelerating. This improves electrical efficiency and reduces thermal output within the enclosure.

How do I resolve an AL.37 (SSCNET communication error) on startup?

AL.37 typically points to optical line attenuation. Inspect your optical fiber cables for tight bends, exceeding the 25 mm limit, check connector ends for dust, and verify the physical TX/RX loop direction.

Does this model support safe torque off (STO) functionality?

Yes, it features integrated STO functionality accessed via the dedicated CN8 connection port, satisfying international functional safety standards.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

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Mitsubishi Electric MR-J4W2-44B MELSERVO-J4 Series 2-Axis Servo Amplifier