Mitsubishi MR-J2S-350A MELSERVO J2S 3.5kW Universal Interface Servo Amplifier

Mitsubishi Electric MELSERVO J2‑Super series MR‑J2S‑350A is a universal interface AC servo amplifier for high‑power industrial motion control and automation systems. Rated output 3.5 kW at 200‑230 V AC, three‑phase input only. Sinusoidal PWM control method with position, speed, and torque control modes. Speed loop frequency response ≥ 550 Hz. Built‑in dynamic brake, forced ventilation cooling. This product has been discontinued by Mitsubishi Electric as of 2015 and is available as a spare part for maintaining existing MELSERVO J2S‑based systems.

Applications:

• High‑power motion control for CNC machine tools and heavy‑duty automation equipment

• Large‑scale packaging machinery and material handling systems

• Industrial robots and automated assembly lines

• Printing presses, textile machinery, and converting equipment

• Legacy system spare part replacement for MELSERVO J2S configurations

Core Specifications:

• Rated output power: 3.5 kW

• Supply voltage: Three‑phase 200‑230 V AC, 50/60 Hz (permitted fluctuation 170‑253 V AC)

• Control method: Sinusoidal PWM control, current control method

• Control modes: Position, speed, torque control (selectable)

• Speed loop frequency response: ≥ 550 Hz

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

• Built‑in dynamic brake: Yes

• Cooling method: Forced ventilation cooling

Advanced Specifications:

• Position control (pulse train input):

  • 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)

• Speed control (analog command):

  • Speed control range: 1:2000 (analog speed command), 1:5000 (internal speed command)

  • Analog speed command input: 0 to ±10 V DC / rated speed

  • Speed fluctuation rate (load change 0‑100%): ±0.01% max.

• Torque control:

  • Analog torque command input: 0 to ±8 V DC (input impedance 10‑12 kΩ)

  • Speed limit: Parameter setting or external analog input (0 to +10 V DC)

• I/O summary:

  • Digital inputs: 8 (24 V DC, sink/source)

  • 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)

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/power outage protection, overspeed protection, excessive error protection.

Physical & Environmental Specifications:

• Dimensions (H × W × D): 168 mm × 90 mm × 195 mm

• Weight: approx. 2.27 kg (5.00 lbs)

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

• Storage temperature: –20 °C … 65 °C

• Operating humidity: ≤ 90 % RH (non‑condensing)

• Altitude: ≤ 1,000 m

• Vibration resistance: 5.9 m/s² max.

• Enclosure rating: Open (IP00)

System Integration:

• This amplifier belongs to the Mitsubishi Electric MELSERVO J2‑Super series.

• Compatible servo motors: HC‑SFS series (medium‑inertia), HC‑LFS series (low‑inertia), HC‑UFS series, HC‑RFS series

• Upgraded motors (HC‑SFS, HC‑LFS) can be connected to MR‑J4‑_A‑RJ amplifiers when migrating systems

• In absolute encoder mode, an external battery (MR‑BAT6V1SET) is required for position retention during power‑off

• Parameter setting and monitoring performed via MR Configurator software using RS‑422/RS‑232C communication

Standards & Compliance:
Refer to manufacturer official documentation for detailed certification and compliance information.

Product Status:
Discontinued as of 2015. Available as a spare part for maintaining existing MELSERVO J2S‑based systems while stocks permit. For new installations, use the recommended successor (MR‑J4‑350B‑RJ020).

Recommended Replacement:

• MR‑J4‑350B‑RJ020: MELSERVO‑J4 series 3.5 kW servo amplifier with SSCNET III/H fiber‑optic communication, 22‑bit absolute encoder support, advanced vibration suppression control, and one‑touch tuning. Designed for drop‑in replacement of MR‑J2S‑350A with J2S compatibility mode. Requires complete drive and motor replacement; not directly compatible with existing wiring or control systems without migration considerations.

Related Products:

• HC‑SFS352 – 3.5 kW medium‑inertia servo motor with 17‑bit absolute encoder

• HC‑LFS352 – 3.5 kW low‑inertia servo motor with 17‑bit absolute encoder

• MR‑J4‑350B‑RJ020 – Recommended replacement (MELSERVO‑J4 series)

• MR‑BAT6V1SET – Battery for absolute encoder

• MR‑J3ENCBL5M‑A1‑L – Encoder cable, 5 m (standard bending life)

• MR‑PWS1CBL5M‑A1 – Power cable, 5 m