The MR-J2S-200B is Mitsubishi Electric’s 2 kW MELSERVO-J2 Super series servo amplifier for 200 V single-phase or three-phase AC power supply with original SSCNET optical fibre network interface — a legacy servo amplifier from Mitsubishi’s second-generation MELSERVO Super platform, providing 2 kW continuous servo control at 11 A via original SSCNET for HC-SFS202 and HC-RFS203 series servo motors in J2S SSCNET multi-axis systems managed by Q172CPU or Q173CPU motion controllers. Atlantech Drives holds stock of the MR-J2S-200B. Contact us for fast worldwide delivery and competitive pricing.
What Is the MR-J2S-200B?
The MR-J2S-200B is a MELSERVO-J2 Super series servo amplifier providing 2 kW (2,000 W) continuous output power via original SSCNET optical fibre, compatible with Mitsubishi HC-SFS202, HC-RFS203, and equivalent 2 kW servo motors with the J2S-era serial encoder protocol. As the 2 kW model in the MR-J2S-B SSCNET sub-series, the MR-J2S-200B provides double the continuous power of the MR-J2S-100B for heavier axis loads — primary feed axes in larger CNC machining centres, main rotation axes in medium-payload robotic systems, and primary gantry drives in large-format material handling equipment built on the J2S SSCNET platform. The amplifier requires a Q172CPU or Q173CPU MELSEC-Q motion controller providing original SSCNET communication — no pulse train input is present. The MR-J2S-200B’s 70 mm housing width is larger than the MR-J2S-100B’s 55 mm, reflecting the higher power component requirements at 2 kW — this dimensional step-up between the 1 kW and 2 kW models should be recorded in system documentation to avoid ordering errors. Like all MR-J2S-B amplifiers, the MR-J2S-200B does not include a built-in STO safety function and communicates with the legacy MR Configurator software via RS-232C. The MR-J2S-200B represents one of the most difficult J2S-B models to source from the aftermarket due to its higher power level and relatively smaller installed base compared to the MR-J2S-100B — proactive spare unit procurement is strongly recommended for facilities with MR-J2S-200B units in critical production equipment.
Key Technical Specifications
- Model: MR-J2S-200B
- Rated Output Power: 2 kW (2,000 W)
- Power Supply: 200–240 VAC single-phase or three-phase, 50/60 Hz
- Continuous Output Current: 11.0 A
- Maximum Output Current: 33.0 A (3× continuous peak)
- Compatible Servo Motors: HC-SFS202, HC-RFS203 (J2S-era motors only)
- Command Interface: SSCNET optical fibre (original SSCNET, not SSCNET III)
- Communication Cycle: 0.888 ms
- Encoder Interface: Serial encoder (J2S-era HC motor encoder protocol)
- Safety Function: None built-in
- Regenerative Brake: Built-in, external regenerative resistor connectable
- Communication: RS-232C (MR Configurator legacy software)
- Compatible Motion Controllers: Q172CPU, Q173CPU
- Operating Temperature: 0°C to 55°C
- Dimensions (W × H × D): 70 mm × 160 mm × 155 mm
- Weight: Approx. 1.9 kg
Typical Industrial Applications
The MR-J2S-200B is found in active service in multi-axis J2S SSCNET systems where 2 kW servo axes provide the correct power for medium-to-heavy load axis applications. In 3-axis CNC vertical machining centres built on the Q172CPU / MR-J2S SSCNET platform, the MR-J2S-200B drives the X, Y, and Z feed axes where 2 kW provides adequate thrust for the combined saddle mass and cutting forces at the machine’s rated feed rates and rapid traverse speeds. Robotic arm axes in medium-payload industrial robots (20–50 kg) from the J2S era use the MR-J2S-200B for the primary shoulder and elbow axes, where the arm-plus-payload inertia requires 2 kW at rated acceleration and speed. In large-format inkjet and laser printing equipment from the J2S era, the MR-J2S-200B drives the media transport and print head carriage axes where 2 kW provides the thrust required for heavy print media and high-speed carriage reversal. Semiconductor wafer handling EFEM (Equipment Front End Module) systems and wafer transport robots from the J2S generation use the MR-J2S-200B for the primary robot arm axes where 2 kW enables the required acceleration rates with full wafer carrier payload. In automotive component assembly transfer systems built on J2S SSCNET platforms, the MR-J2S-200B drives primary transfer linear axes and rotary indexing drives where the combined carrier mass and payload requires sustained 2 kW at the required transfer cycle rates. The MR-J2S-200B maintenance replacement scenario arises most commonly in facilities with large J2S-era equipment fleets in automotive manufacturing, semiconductor fabrication, and electronics assembly — industries where the equipment’s process performance remains acceptable but individual component failures require sourcing from an increasingly constrained aftermarket.
Replacement & Upgrade Notes
The MR-J2S-200B upgrade to current Mitsubishi servo technology requires the same complete simultaneous system replacement as all MR-J2S-B models: motion controller (Q172CPU/Q173CPU → Q172DSCPU or RD77MS), SSCNET cables (original SSCNET → SSCNET III or SSCNET III/H POF), amplifier (MR-J2S-200B → MR-J3-200B or MR-J4-200B), and servo motor (HC-SFS202/HC-RFS203 → HG-SR202/HG-RR203). This four-component simultaneous replacement, combined with complete servo re-tuning from factory defaults, represents a significant planned upgrade project — typically requiring 2–4 hours per axis for mechanical and electrical changeover plus commissioning, executed during a planned production shutdown. For facilities where a complete J2S-to-J4 system migration cannot be planned in the near term, the interim maintenance strategy is to source authentic MR-J2S-200B replacement units from specialist aftermarket distributors, maintain a parameter backup archive for all installed units, and monitor the amplifiers annually for early indicators of capacitor and cooling fan degradation. Atlantech Drives maintains verified stock of MR-J2S-200B units with 12-month warranty for immediate dispatch to minimise production downtime in emergency replacement scenarios — contact us for current stock availability before planning maintenance schedules that depend on MR-J2S-200B sourcing. For the HC-SFS202 and HC-RFS203 servo motors used with the MR-J2S-200B, note that these motors are also discontinued and available only from aftermarket inventory — a failed motor in a MR-J2S-200B system requires aftermarket sourcing of the same J2S-era motor, as no current-generation motor is compatible with the MR-J2S-200B encoder interface. Plan for both amplifier and motor spare parts in facilities with critical J2S-200B-driven production equipment.
Frequently Asked Questions
Q: Can the MR-J2S-200B’s servo parameters be backed up without MR Configurator if the legacy software cannot be installed on the available maintenance laptop?
A: MR Configurator (the legacy software, not MR Configurator2) is required for MR-J2S-200B parameter access — there is no alternative software tool for J2S parameter read/write. If MR Configurator cannot be installed on a modern laptop, options include: running MR Configurator in a Windows XP or Windows 7 virtual machine (using VMware or VirtualBox) on the modern laptop with a USB-to-RS-232C adapter, using a dedicated old laptop with Windows XP already installed and a native RS-232C port, or obtaining technical support from Mitsubishi or a specialist integrator who maintains legacy software tooling for J2S systems.
Q: What visual indicators on the MR-J2S-200B suggest the DC bus capacitors are approaching failure?
A: Visual indicators of capacitor degradation in the MR-J2S-200B include: bulging of the aluminium capacitor top (the normally flat top develops a dome shape as internal pressure increases), electrolyte residue visible on the capacitor body or PCB adjacent to the capacitor (a brown or black staining indicating electrolyte leakage), and a discolouration or darkening of the PCB area near the capacitors caused by heat from increased capacitor ESR losses. Inspect the capacitors by shining a torch through the amplifier’s ventilation openings — the capacitors are typically visible through the side or bottom ventilation slots. Any visible bulging or leakage indicates that proactive replacement or unit retirement should be scheduled immediately.
Q: Is the MR-J2S-200B compatible with the Q170MCPU compact motion controller?
A: The Q170MCPU compact motion controller uses SSCNET III communication (compatible with MR-J3-B amplifiers), not the original SSCNET used by the MR-J2S-200B. The Q170MCPU is therefore not compatible with the MR-J2S-200B. Only the Q172CPU and Q173CPU motion controllers (both discontinued) use original SSCNET compatible with the MR-J2S-200B.
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