MIV08-3-VAC Okuma
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The Okuma MIV08-3-VAC is an inverter unit from the MIV Servo Drives series featuring a 1-axis configuration and a rated continuous capacity of 7.5 kW, or 10 horsepower. It operates on a DC bus supply of 300 VDC and uses 24 VDC for control power. The unit measures 380 mm in height, 100 mm in width, 325 mm in depth, and weighs 7.3 kg.
Internal Product Review
The MIV08-3-VAC is an Okuma inverter unit in the MIV Servo Drives series, engineered for precise 1-axis control. A 7.5 kW rated continuous capacity with a 300 VDC DC bus supply gives this drive strong, stable performance for high-demand motion applications.
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Product Description:
The MIV08-3-VAC inverter unit is produced by Okuma for the MIV Servo Drives series. It supplies pulse-width-modulated output to a single servo channel and accepts command and feedback links from an upstream CNC controller. In a machining center or other automated cell, the module regulates motor torque and speed while monitoring internal status data for the system supervisor. Its single-channel design allows the controller to manage one connected motor axis through the drive rack.
The control section is powered by a dedicated 24 VDC service rail that keeps the logic active even when the main link is de-energized. Motor energy is drawn from a shared DC bus rated at 300 VDC, so multiple axes can recover power through common braking hardware. Continuous drive capacity reaches 7.5 kW (10 hp), matching medium-frame servomotors on feed or spindle axes. A speed monitor port is scaled at 1562 rpm/V, allowing the CNC to translate the analog feedback into revolutions per minute without additional calibration. For load verification, the torque monitor delivers a full-scale signal of 3 V. The unit operates as a single-axis node on the motion network, and its 5-bit controller ID switch allows a unique identity to be assigned within the drive rack. Position-sensing fidelity is supported by a voltage error factor of 1/42, while the Z-phase comparators provide minimum amplitudes of 1.4 V on Vz1 and 0.5 V on Vz2.
The module has a depth of 325 mm, a height of 380 mm, and a width of 100 mm. With a mass of 7.3 kg, it can be mounted on lightweight slide-out panels without exceeding typical rail loads. The narrow width conserves horizontal cabinet space, while the height and depth must be considered when arranging adjacent drives and wiring channels. Adequate clearance around the housing supports airflow between neighboring modules. Space behind and around the unit also allows power, control, and feedback cables to bend without placing excessive strain on their connectors.
