Product Description:

The BL3-D75A is an Okuma drive module in the BL Servo Motors series and serves as the servo power interface for one motion axis in a CNC or general-purpose automation rack. Classified as an AC drive unit, it supplies regulated current to the matching motor and executes positioning commands issued by the machine controller. This makes it a core component in closed-loop motion systems where stable speed, torque, and position control are required. Its role in the rack is to translate controller demand into motor output while maintaining the regulated electrical conditions needed by the axis.

The unit is identified as an AC Servo Drive, so it converts line power into controlled three-phase output for vector-controlled operation. It accepts utility line frequencies of 50/60 Hz on the three input terminals marked R, S, T. Internally, the power section is rated for a continuous output of 75 A, which matches the largest motor current supported within the BL family. Four front-panel DIP switches set parameter defaults, and the factory combination of OFF, OFF, ON, ON selects the standard gain set and alarm response profile without additional programming. These electrical and configuration features govern how the BL3-D75A conditions energy and reports status to the supervisory CNC rack.

The single-axis architecture lets the drive manage exactly 1 controlled motor, and monitor points labeled M1, M2, M3, M4, IU, IV, VDC provide access to internal signals. These test points support setup and diagnostic checks across the four supported current capacities of 15 A, 30 A, 50 A, 75 A. Mechanical fit and wiring match earlier BL-D products, which helps maintain cabinet layout consistency across the BDU and BL-D Units range. Additional field options include leaving the Cn20 jumper connected for default fault masking and installing the drive as a type A module when multiple BL sections share the same DC bus.