Mitsubishi MR-J3 Series Servo Amplifiers | MR-J3-200AN MAX-20 C F12 EK 11 1910680

Technical Dossier

Product Details And Specifications

Mitsubishi Electric MR-J3 Series: Comprehensive Module Range and Technical Overview

The Mitsubishi Electric MR-J3 Series is a third-generation AC servo amplifier platform engineered for high-precision motion control in continuous-duty industrial environments. Deployed across petrochemical refineries, nuclear power auxiliary systems, automotive body welding lines, steel rolling mills, and large-scale chemical processing plants, the MR-J3 platform represents one of the most widely installed servo drive families in global heavy industry. Its SSCNET III fiber-optic network architecture enables deterministic, noise-immune communication at 150 Mbps between the controller and up to 16 axes, making it the reference standard for synchronized multi-axis applications where cable-induced EMI is a disqualifying factor.

The series covers output ratings from 10 W to 55 kW, accommodating everything from precision indexing tables to large gantry systems. The MR-J3 platform is fully compatible with Mitsubishi's MELSERVO-J3 servo motors (HF, HA, HG families) and integrates directly with the MELSEC Q-series and iQ-R motion controllers via the Motion CPU (Q17nCPUN, Q17nDSCPUN).

The Evolution of MR-J3 Architecture

Mitsubishi's MELSERVO servo amplifier lineage progressed through clearly defined generations, each addressing the bandwidth and integration limitations of its predecessor:

MR-J (1990s): Analog command interface, resolver feedback, no network capability. Requires manual gain tuning. Now fully obsolete; replacement parts are sourced exclusively from secondary markets.

MR-J2 / MR-J2S (late 1990s–2000s): Introduced digital pulse-train command (PP/PG mode) and RS-422 serial communication. The MR-J2S added real-time auto-tuning and expanded the compatible motor range. Still operational in legacy machinery but discontinued from Mitsubishi's active production roster.

MR-J3 (2004–2015 active production): Introduced SSCNET III (fiber optic, 150 Mbps), 262,144 pulse/rev encoder resolution, advanced vibration suppression (two-degree-of-freedom control), and full-closed loop support via external encoder input. The MR-J3 is now in the mature/end-of-life phase; Mitsubishi has officially transitioned support to the MR-J4 and MR-J5 platforms. Spare parts and replacement units are available through authorized distributors and specialist suppliers such as DriveKNMS.

MR-J4 (2012–present): SSCNET III/H (600 Mbps), one-touch tuning, functional safety (STO, SS1, SLS) via MR-D30 safety option unit. Direct upgrade path from MR-J3 with mechanical compatibility on most motor frames.

MR-J5 (2021–present): EtherCAT and CC-Link IE TSN network options, enhanced cybersecurity, integrated STO without external option unit. Represents the current-generation platform for new installations.

For facilities running MR-J3-based systems, the primary compatibility concern is SSCNET III vs. SSCNET III/H: MR-J3 amplifiers cannot be mixed on the same fiber-optic chain with MR-J4/J5 units without a network bridge module (MR-J3-T10).

MR-J3 Full Catalog & Functionalities (SKU List)

The following SKUs represent the core MR-J3 product range. Each unit is a standalone servo amplifier unless noted. Output capacity is stated as continuous rated output.

MR-J3-10A: 100 W, 200 VAC single/three-phase, pulse-train command (A-type, non-SSCNET).
MR-J3-20A: 200 W, 200 VAC, pulse/analog command, incremental encoder interface.
MR-J3-40A: 400 W, 200 VAC, A-type command interface, DIN-rail mountable.
MR-J3-70A: 750 W, 200 VAC, supports full-closed loop via CN2L connector.
MR-J3-100A: 1 kW, 200 VAC, built-in regenerative resistor, dynamic brake standard.
MR-J3-200A: 2 kW, 200 VAC, A-type (pulse/analog), compatible with HF-SP series motors.
MR-J3-350A: 3.5 kW, 200 VAC, enhanced current loop bandwidth, suitable for high-inertia loads.
MR-J3-500A: 5 kW, 200 VAC, requires external regenerative resistor for high-duty cycles.
MR-J3-700A: 7 kW, 200 VAC, three-phase input mandatory, forced-air cooling integrated.
MR-J3-11KB: 11 kW, 200 VAC, B-type (SSCNET III fiber-optic network axis).
MR-J3-15KB: 15 kW, 200 VAC, SSCNET III, compatible with HA-LP series large-frame motors.
MR-J3-22KB: 22 kW, 200 VAC, SSCNET III, requires MR-PWS1CBL power supply cable set.
MR-J3-200AN: 2 kW, 200 VAC, A-type with full-closed loop (N-suffix = CN2L encoder input enabled); this listing: unit code MAX-20 C F12 EK 11, internal reference 1910680.
MR-J3-350AN: 3.5 kW, A-type with full-closed loop support, dual encoder interface.
MR-J3-500AN: 5 kW, full-closed loop, external linear scale compatible via CN2L.
MR-J3-10B: 100 W, SSCNET III network axis, fiber-optic IN/OUT connectors standard.
MR-J3-20B: 200 W, SSCNET III, used as slave axis in Q17nCPUN multi-axis systems.
MR-J3-100B: 1 kW, SSCNET III, standard network servo for synchronized motion applications.
MR-J3-200B: 2 kW, SSCNET III, high-speed positioning with vibration suppression filter.
MR-J3-500B: 5 kW, SSCNET III, supports absolute position detection with MR-BTAS01 battery.

Sourcing Hard-to-Find & Obsolete MR-J3 Series Parts

Mitsubishi Electric formally transitioned the MR-J3 series to the end-of-active-production phase. New unit procurement through standard distribution channels is increasingly constrained, with lead times extending to 26–52 weeks for certain capacity ranges. For facilities operating MR-J3-based production lines, unplanned downtime caused by amplifier failure represents a direct production loss that cannot be absorbed by standard procurement timelines.

DriveKNMS maintains a dedicated inventory of MR-J3 series amplifiers, including low-volume variants such as the MR-J3-200AN (MAX-20 C F12 EK 11, ref. 1910680) and other N-suffix full-closed-loop models that are rarely stocked by general distributors. Our sourcing network covers:

• New-old-stock (NOS) units from verified industrial surplus channels
• Professionally refurbished units with full functional test documentation
• Exchange programs: failed unit return against tested replacement dispatch
• Long-term supply agreements for facilities with multi-axis MR-J3 installations

Quality Control for the MR-J3 Range

MR-J3 amplifiers present specific test challenges due to their SSCNET III fiber-optic interface, multi-mode encoder feedback paths, and integrated regenerative circuits. DriveKNMS applies the following test protocol to all MR-J3 units processed through our facility:

• Power stage verification: IGBT gate drive waveform analysis under resistive load; leakage current measurement on DC bus capacitor bank.
• Encoder interface test: Functional verification of CN2 (incremental/absolute) and CN2L (full-closed loop) ports using calibrated encoder simulator; confirmation of 262,144 pulse/rev resolution integrity.
• SSCNET III / analog command test (model-dependent): For B-type units, fiber-optic link establishment with Q17nCPUN controller; for A-type units, pulse-train and analog ±10 V command response verification.
• Regenerative circuit test: Charge/discharge cycle on internal regenerative resistor; external resistor terminal continuity check.
• Dynamic brake test: Activation latency measurement; DB resistor thermal integrity check.
• Parameter backup: All factory default parameters verified against Mitsubishi MR-J3 parameter table prior to dispatch.
• Burn-in: Minimum 4-hour continuous operation at rated load before release.