Mitsubishi MR-J2S-70A MELSERVO J2S 750W Universal Interface Servo Amplifier

Mitsubishi Electric MR-J2S-70A is a universal interface AC servo amplifier from the MELSERVO J2‑Super series for precision motion control in industrial automation systems. Rated output 750 W at 200‑230 V AC, single‑phase or three‑phase input. Sine‑wave PWM control method with position, speed, and torque control modes. Speed loop frequency response of 550 Hz or higher supports high‑speed positioning applications. Built‑in dynamic brake, natural cooling, 17‑bit absolute/incremental encoder feedback (131,072 pulses/revolution). This product is discontinued and available as a spare part for maintaining existing MELSERVO J2S‑based systems.

Applications:

• CNC machine tools and high‑speed positioning equipment

• Automated assembly lines and pick‑and‑place robotics

• Packaging machinery and labeling equipment

• Semiconductor and electronics manufacturing equipment

• Material handling systems and small conveyor control

Core Specifications:

• Product type: MELSERVO J2‑Super series servo amplifier

• Rated output power: 750 W (0.75 kW)

• Supply voltage: 200‑230 V AC, 50/60 Hz (single‑phase or three‑phase input)

• Permissible voltage fluctuation: 3‑phase 200‑230 V AC: 170‑253 V AC; single‑phase 230 V AC: 207‑253 V AC

• Control method: Sine‑wave PWM control / current control method

• Control modes: Position, speed, torque control

• Speed loop frequency response: ≥ 550 Hz

• Encoder feedback: 17‑bit absolute/incremental encoder (131,072 pulses/revolution)

• Built‑in dynamic brake: yes

• Cooling method: Natural cooling (fanless)

• Enclosure rating: IP20

• Dimensions (H × W × D): 168 mm × 70 mm × 190 mm

• Weight: approx. 2.5 – 4.0 kg

• Ambient operating temperature: 0 °C … 55 °C

• Storage temperature: –20 °C … 65 °C

Position Control Specifications:

• Maximum input pulse frequency: 500 kpps (differential line driver), 200 kpps (open‑collector)

• Electronic gear: A/B multiplication (A = 1‑65535, B = 1‑65535, 1/50 < A/B < 500)

• Positioning complete width: 0 to ±10,000 pulses (command pulse unit)

I/O Summary:

• Digital inputs: 8 (24 V DC, sink/source: EMG, LSP, LSN, SON, RES, PC/ST1/RS2, TL/ST2/RS1, SP2)

• Digital outputs: 3 (relay contact type: ALM, ZSP, TLC/VLC)

• Analog inputs: 2 (TLA/TC: 0‑10 V DC, VC/VLA: –10 to +10 V DC)

Advanced Features:

• Advanced real‑time auto‑tuning (32‑segment response level)

• Advanced vibration suppression control

• Mechanical analysis function (frequency characteristics analysis, mechanical resonance suppression filter setting)

• Mechanical simulation function (response simulation without actual motor replacement)

• Machine diagnosis function

• Model adaptive control

Protection Functions:
Overcurrent shut‑off, regenerative overvoltage shut‑off, overload shut‑off (electronic thermal), servo motor overheat protection, encoder fault protection, regeneration fault protection, undervoltage/sudden power outage protection, overspeed protection, excessive error protection

Product Status:
Discontinued. Mitsubishi Electric discontinued the MELSERVO J2S series in August 2015 (mass production end). Repairs accepted through August 2022. Available as a spare part for maintaining existing MELSERVO J2S‑based systems while stocks permit. For new installations, use the recommended successor (MR‑J4‑70A or MR‑J4‑70B depending on interface requirement). A Renewal Tool (MR‑J2S‑70A → MR‑J4‑70A‑RJ) is available for staged migration while retaining existing motors.

Recommended Replacement:

• MR‑J4‑70A: MELSERVO‑J4 series 750 W servo amplifier with universal interface (pulse train), 4 Mpps max input frequency, 22‑bit absolute encoder support, advanced vibration suppression control, and one‑touch tuning. Requires motor replacement to HG series for full performance, but staged migration using Renewal Tool may allow temporary retention of existing motors.

• MR‑J4‑70B: SSCNET III/H fiber‑optic communication version for multi‑axis synchronisation with Mitsubishi motion controllers.

Related Products:

• MR‑BAT6V1SET – Battery for absolute encoder (for absolute position retention)

• MR‑J2S‑RENEWAL‑KIT – Renewal Tool for staged MR‑J2S to MR‑J4 migration

• MR Configurator – PC software for parameter setting, monitoring, and tuning via RS‑422 communication

• HG‑KR73J – 750 W low‑inertia servo motor with 22‑bit absolute encoder (recommended mating motor for MR‑J4‑70A)