The MR-J4-200B is Mitsubishi Electric’s 2 kW MELSERVO-J4 series servo amplifier for 200 V single-phase or three-phase AC power supply with SSCNET III/H optical fibre network interface — providing closed-loop servo control at continuous rated output current of 11.0 A for Mitsubishi HG-SR and HG-RR series 2 kW servo motors, addressing heavier axis requirements in multi-axis SSCNET III/H machine tool, robotic, and automated handling systems where 2 kW of continuous servo power provides the tractive effort required for larger saddle masses, longer axis travels, and higher sustained feed forces. Atlantech Drives holds stock of the MR-J4-200B. Contact us for fast worldwide delivery and competitive pricing.
What Is the MR-J4-200B?
The MR-J4-200B is a MELSERVO-J4 series servo amplifier providing 2 kW (2,000 W) continuous output power via SSCNET III/H, compatible with Mitsubishi HG-SR202, HG-SR2024, HG-RR203, and equivalent 2 kW servo motors with 22-bit multi-turn absolute encoders. The transition from the MR-J4-100B (1 kW, 55 mm wide) to the MR-J4-200B involves a housing width increase to 70 mm, reflecting the larger power components and improved heat dissipation required for 2 kW output at 11 A continuous current — this width change should be considered when designing a mixed-power multi-axis panel layout. Like all MR-J4-B variants, all position commands are delivered exclusively via SSCNET III/H optical fibre at 0.888 ms or 0.444 ms cycle time. The MR-J4-200B is compatible with the same SSCNET III/H motion controllers as other MR-J4-B amplifiers: Q172DSCPU, Q173DSCPU, RD77MS, and FX3U-20SSC-H, enabling mixed 1 kW and 2 kW axes on the same SSCNET III/H chain with identical command update rates and synchronisation performance regardless of per-axis power rating.
Key Technical Specifications
- Model: MR-J4-200B
- 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: HG-SR202, HG-SR2024, HG-RR203, HG-RR2034 and equivalent
- Command Interface: SSCNET III/H optical fibre (150 Mbps full-duplex)
- Communication Cycle: 0.444 ms or 0.888 ms (selectable)
- Encoder Interface: Serial 22-bit absolute encoder (262,144 pulses/rev)
- Safety Function: STO (Safe Torque Off), IEC 61800-5-2 SIL2 / EN ISO 13849-1 PLe
- Regenerative Brake: Built-in, external MR-RB series resistor connectable
- Housing Width: 70 mm
- Operating Temperature: 0°C to 55°C
- Dimensions (W × H × D): 70 mm × 170 mm × 178 mm
- Weight: Approx. 2.0 kg
Compatibility & System Integration
The MR-J4-200B integrates into SSCNET III/H multi-axis servo systems using identical fibre optic daisy-chain topology as all other MR-J4-B amplifiers — the amplifier’s CN1A port receives the SSCNET III/H signal from the preceding device (motion controller or previous amplifier) and its CN1B port passes the signal to the next amplifier in the chain. This topology enables a single Q172DSCPU motion controller to simultaneously manage axes using MR-J4-100B (1 kW), MR-J4-200B (2 kW), MR-J4-500B (5 kW), and any other MR-J4-B power class — the motion controller treats all amplifiers identically from a communication perspective, with only the servo gain parameters and motor data differing per axis. For common bus power supply sharing (where multiple MR-J4-B amplifiers share a single AC power supply with a common DC bus), the MR-J4-200B can participate in a MR-CR55K or MR-CR200K common converter configuration alongside other MR-J4-B amplifiers — the common converter rectifies the AC supply once and distributes the DC bus to all amplifiers, improving energy efficiency through regenerative power sharing between motoring and braking axes. The MR-J4-200B is also compatible with the MR-J4-T20 sub-converter unit for connecting to a common DC bus in systems where individual AC supply to each amplifier is impractical. In multi-axis systems requiring STO safety function, the MR-J4-200B’s dual-channel STO input (CN8 connector) connects to a safety relay or safety PLC output, achieving IEC 62061 SIL2 / ISO 13849-1 PLe when wired according to the MR-J4 safety sub-function instruction manual.
Maintenance Tips
The MR-J4-200B’s absolute encoder battery (MR-BAT6V1SET) retains multi-turn absolute position data during power-off and should be replaced every 3–5 years at 25°C ambient, or more frequently in high-temperature environments. Monitor the battery voltage via MR Configurator2’s diagnostic display or via the motion controller’s servo alarm status — AL.9E (battery warning) activates when the battery voltage drops below 3.1 V, providing approximately 1–3 months of remaining battery life. Replace the battery with the machine powered ON where possible — the MR-J4-200B retains absolute position data during battery replacement as long as the amplifier control power (L1C, L2C) remains applied. If the amplifier is powered off during battery replacement and the battery is removed for more than the internal capacitor backup time (approximately 1 minute), the multi-turn position counter is lost and a homing cycle must be performed at next power-up. For MR-J4-200B amplifiers installed in environments with significant vibration (press room, stamping line proximity), inspect the encoder cable connector (CN2 on the amplifier side and the motor-side connector) at the annual maintenance interval — vibration-induced connector micro-movement causes fretting corrosion at the signal pin contact that manifests as AL.16 (encoder error) alarms before complete connector failure.
Frequently Asked Questions
Q: Can the MR-J4-200B share a single AC power supply input with an MR-J4-100B in the same multi-axis panel?
A: Yes, but with careful current calculation. Multiple MR-J4-B amplifiers of different power ratings can share a common AC supply rail — wire the L1, L2, (L3 for three-phase) supply terminals on each amplifier individually from the same supply rail. The supply rail, wiring, and circuit protection must be rated for the sum of all amplifier rated input currents. For a panel with one MR-J4-200B (approximately 12 A input at 2 kW / 200 V single-phase) and two MR-J4-100B amplifiers (approximately 7 A each), the total supply current demand is approximately 26 A — size the circuit breaker and supply wiring accordingly.
Q: What is the difference between the MR-J4-200B and the MR-J4-200B4 in terms of application?
A: The MR-J4-200B operates from 200–240 VAC three-phase or single-phase supply and produces 2 kW output. The MR-J4-200B4 is the 400 V three-phase variant, operating from 380–480 VAC and providing the same 2 kW output at lower input current — beneficial in facilities with 400 V three-phase supply infrastructure where lower input current reduces wiring cross-section requirements. The servo motor compatibility and SSCNET III/H performance are identical between the 200 V and 400 V variants; only the power supply input voltage and corresponding input current differ.
Q: Can the MR-J4-200B be commissioned for torque control mode for a winding or tension control application?
A: Yes. The MR-J4-200B supports torque control mode via the motion controller’s servo program — in torque mode, the motion controller sends torque reference values (in percentage of rated torque) to the MR-J4-200B via SSCNET III/H each communication cycle, and the amplifier’s current loop regulates the motor current to produce the commanded torque. This mode is used for winding, unwinding, tension control, and press-fit operations where force rather than position is the primary control variable. Configure the operating mode in the motion controller’s servo parameter settings (not in the MR-J4-200B directly) to switch between position, speed, and torque control modes.
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