2-axis servo drive for compact multi-axis stations
The Mitsubishi MR-J4W2-44B is a digital AC servo amplifier from the MELSERVO-J4 Series, packing two independent axes into a single 19.5 cm by 6 cm by 16.8 cm enclosure. Each axis delivers 0.4 kW of rated output, making it a space-efficient choice for small multi-axis stations like pick-and-place gantries, labeling heads, or conveyor diverters where panel real estate is tight. Communication runs on SSCNETIII/H, Mitsubishi's high-speed motion network, so it drops into a J4-based system without a separate interface card. The W2 suffix confirms this is the 2-axis variant — one part does the work of two single-axis drives in a fraction of the DIN-rail footprint.
What the 0.4 kW rating means on the floor
0.4 kW per axis is the continuous rated output, sized for small to medium servo motors — think 400 W class. That covers most 1/2 HP equivalent applications: indexing tables, small belt drives, or vertical axes on light assembly machines. The amplifier will drive the motor up to that load continuously; momentary peak torque during acceleration is higher, but the continuous rating is the number to match against your motor's nameplate. Because it's a dual-axis unit, the total continuous output the amplifier can source is 0.8 kW across both axes, but each axis is independently controlled — you're not sharing current between them. That matters when one axis holds a load while the other moves.