The MR‑J3‑200B servo drive is a MELSERVO‑J3‑type AC servo amplifier that interfaces with Mitsubishi HC‑KP, HF‑KP, and related servo motors to provide closed‑loop motion control in industrial automation systems. It operates on 3‑phase 200–230 V AC (or 1‑phase 200–230 V AC, depending on the MR‑J3‑200B variant), with a rated power output of 2.0 kW and a driving current up to about 11 A, enabling high‑torque and high‑inertia‑load capability for demanding axis‑motion tasks. The drive supports position, speed, and torque control modes, making it suitable for CNC milling, turning, robotics, packaging, and material‑handling axis where precise trajectory, stable speed, or regulated torque are required.
Technically, the MR‑J3‑200B uses sine‑wave PWM control and current‑loop control to deliver smooth, low‑vibration motor operation and high‑speed response, with a speed frequency response up to about 2100 Hz and high‑resolution encoder feedback (up to 18‑bit encoders with 262,144 pulses per revolution), enabling fine‑tuning of positioning accuracy and settling time. It includes built‑in safety and protection features such as overcurrent, overvoltage, overload (electronic‑thermal), motor‑overheat, encoder‑fault, undervoltage, overspeed, and excess‑error protection, which help prevent hardware damage during fault conditions. The drive can accept digitally or analogically set torque limits, speed limits, and position references, and provides regenerative braking via internal or external resistors. The compact open‑type structure (IP00) is designed for installation in control cabinets with adequate cooling and dust control, and the unit draws power at 0–360 Hz output frequency with a DC‑link output of about 170 V.
Mechanically, the MR‑J3‑200B is a rack‑mount servo‑amplifier unit that fits into standard automation panels and PLC‑type cabinets, with terminals for main‑power input (L1, L2, L3, U, V, W), motor‑feedback connector, and signal connectors for I/O, encoders, and communication. It supports diverse communication interfaces, including SSCNET III (high‑speed fiber‑optic fieldbus for multi‑axis synchronization) and RS‑485 for parameter setting and monitoring, enabling integration with Mitsubishi Motion controllers (e.g., MELSEC‑Q series) and higher‑level automation systems. The compact form factor and plug‑and‑play configuration capability simplify wiring and commissioning, while Mitsubishi’s MR‑PRU03 parameter unit allows on‑site parameter tuning, monitoring, and alarm display. The amplifier operates in an ambient temperature range of 0–55 °C and non‑condensing humidity up to 90% RH, making it suitable for most industrial‑automation environments.
