MIV0404A-1-B3 Okuma
Wake Industrial LLC is not an authorized distributor of this product.
The Okuma MIV0404A-1-B3 is an inverter unit from the MIV Servo Drives series with a rated capacity of 4.0 kW per axis and supports two axes. It operates on a 24 VDC control supply and a 300 VDC DC bus, and features a BL motor type. Its external dimensions are 380 by 60 by 295 mm, and it weighs 5.5 kilograms.
Internal Product Review
The MIV0404A-1-B3 is an Okuma inverter unit designed for 2-axis servo applications. A 300 VDC DC bus supply and 4.0 kW × 4.0 kW rated capacity give the drive strong output for demanding machine duty. A 24 VDC control supply supports clean integration, making the unit a very capable choice for dual-axis BL motor systems.
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Product Description:
The MIV0404A-1-B3 is an Okuma inverter unit in the MIV Servo Drives series. It interfaces with a CNC controller to regulate two servo axes by modulating DC bus energy for brushless motors and returning speed, torque, and alarm data to the machine control. By combining power conversion and feedback connections in one enclosure, the drive simplifies multi-axis motion architecture in machining centers and other automated production equipment.
This model uses a two-axis layout with two 4.0 kW channels, allowing it to operate identical motor loads without derating either channel. Incoming power is supplied through a shared DC rail at 300 VDC, while the logic and encoder electronics use a separate 24 VDC control supply that can maintain position data when the main bus is shut down. The drive is tuned for Okuma’s BL motor profile, whose stator characteristics and resolver feedback are matched to the gate-drive pattern. A 5-bit controller ID switch allows the rack CPU to address the unit without requiring software changes. The individual L and M channels receive unique axis identifiers to support separate fault detection and signal tracing. Speed and torque monitor outputs have ±3 V ranges, providing analog signals that represent real-time motor load conditions during system checks.
The enclosure measures 380 × 60 × 295 mm and has a mass of 5.5 kg, allowing the module to fit into densely populated electrical cabinets used with high-speed lathes and similar machinery. The speed monitor provides 1,562 rpm/V, so one volt corresponds to approximately 1,562 rpm when the output signal is measured. The torque channel produces 3 V at peak torque, providing a clear analog indication when the connected motor reaches its maximum torque level. Axis terminals use M6 screws on the upper bar and M4 screws on the lower bar, separating high-current motor conductors from signal returns. Housing markings identify the L and M axes to help keep cable routing consistent during installation and service work.
