The Mitsubishi MR-J2S-400W is a 400W AC servo amplifier from the MELSERVO-J2S series, designed for high-precision motion control applications. It accepts 200-230VAC input (single-phase or 3-phase), delivering 170V output at 0-360Hz with 2.8A rated output current. The J2S series features built-in dynamic braking and supports position, speed, and torque control modes. It is compatible with Mitsubishi HC-KFS, HC-MFS, and HC-SFS series servo motors up to 400W. The compact modular design with natural cooling enables dense panel mounting. As a discontinued product (replaced by MR-J3 and MR-J4 series), the J2S remains widely deployed in existing machinery and is a critical spare part for maintenance. Typical applications include CNC machine tool axis drives, robotic arms, conveyor positioning, packaging machinery, and automated assembly lines where precise servo control is essential.
**Q: What is the current replacement for the discontinued MR-J2S-400W?**
A: The direct replacement is the Mitsubishi MR-J4-40A (400W) from the MELSERVO-J4 series. Consider MR-JE-40A for cost-sensitive applications. Note that motor/encoder cables and connectors differ between J2S and J4 generations.
**Q: Can this drive operate on single-phase input?**
A: Yes, the MR-J2S-40B variant accepts both single-phase (200-230VAC) and 3-phase input. The -40A variant requires 3-phase only. Verify the specific model suffix before installation.
**Q: What servo motors are compatible with the MR-J2S-400W?**
A: Compatible motors include Mitsubishi HC-KFS series (low inertia), HC-MFS series (ultra-low inertia), and HC-SFS series (medium inertia) up to 400W rating. The motor must have a compatible encoder interface.
**Q: What software is used to set up the MR-J2S drive?**
A: Mitsubishi MR Configurator (MRZJW3-SETUP) software is used for parameter setting, tuning, and diagnostics. It connects via RS-232 serial or USB-to-serial adapter to the CN3 communication port.
**Q: Why replace a J2S with newer series?**
A: The J2S is an older generation with limited encoder resolution (17-bit max), slower speed frequency response, and discontinued support. J4 series offers 22-bit encoders, 3.5kHz response, and enhanced vibration suppression for better machine performance.
