Product Description:

The MDU-0404-F servo amplifier is produced by Okuma as part of the MDU Servo Drives series. As an inverter-based servo drive, it supplies regulated power to machine axes and converts the facility's AC mains into controlled signals for synchronous motor operation. Within an automated cell, the unit executes velocity and position commands from an Okuma numerical control, allowing coordinated motion of tool carriages, rotary tables, and auxiliary actuators. Its compact rack format and shared bus design simplify installation inside machining center cabinets.

The input stage accepts an alternating supply rated at 200 VAC, a voltage level commonly used in Okuma machine tools installed in Asia and North America. Internally, the converter creates a DC link that floats between 283–625 VDC; this range indicates permissible ripple while the regenerative brake and shared bus energy flow keep the link within limits. The power interface is wired for three-phase operation so each leg contributes balanced current and reduces harmonic stress. Because the model is designed for two-axis control, its gate drivers and current sensors are duplicated in two identical channels, allowing simultaneous feedback loops without cross-coupling. All motor output is handled as AC waveforms synthesized by insulated-gate transistors, providing sinusoidal excitation suited to permanent-magnet servomotors.

As a Servo Drive, the unit belongs to the motion layer of the Okuma architecture and interfaces directly with encoders while amplifying sub-millisecond current commands. Its classification as an Inverter Unit highlights the presence of pulse-width-modulated bridges that invert the DC link back into phase-aligned outputs. Compatibility with the P200/P200A/P300 control family means parameter tables, alarm codes, and fiber-optic serial links are already standardized, which helps simplify setup. The drive carries out Axis Control functions such as position loop closure, torque limit enforcement, and velocity feed-forward, allowing contouring routines without additional external motion cards.