BLII-D150A Okuma
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MPN: 1006-0615-12-15
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The Okuma BLII-D150A is an AC servo drive from the BL Servo Drives series with a 1-axis configuration. This drive uses IGBT inverter switches, features a power unit capacity of 150 Amps, and is equipped with a resistor block for regenerative discharge. It includes resistor-based current sensing and a LED warning charge indicator.
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Product Description:
The BLII-D150A is an AC servo drive produced by Okuma within the BL Servo Drives series. This unit functions as the power and control interface between an Okuma servo controller and a matched servomotor, providing closed-loop speed and torque regulation for a single machine axis in industrial automation cells. Because the drive processes line power, converts it to controlled three-phase output, and monitors motor feedback, it enables precise position control on lathes, mills, and handling robots.
The BLII-D150A is designed for a 1-axis load, so all gating logic, current loops, and fault detection are dedicated to one motion channel. Control power is fed through terminals AC1 and AC2, which isolate low-level circuitry from the main bus. This separation helps protect the control section from noise generated in the power stage. Three-phase mains enter through terminals R, S, T, and E, and the processed output leaves on motor terminals U1, V1, W1, and E. The power section is rated for a continuous capacity of 150 A, allowing the drive to energize large-frame Okuma servomotors without derating. It integrates vector modulation, encoder feedback processing, and fault-coded diagnostics rather than relying on external amplifiers.
The conversion path starts with a rectifier that uses a Diode array to create a stable DC link. Current flowing through the link is measured by a Resistor sense element, enabling overcurrent protection and phase-balance monitoring before the inverter stage. Switching is executed by an IGBT module, giving fast turn-off times and high efficiency at pulse-width-modulated frequencies. This arrangement lets the drive regulate motor power quickly during acceleration, steady running, and braking. During deceleration events, excess energy is directed into a Resistor Block, preventing overvoltage on the DC bus and removing the need for an external dump unit. A front-panel LED acts as a charge warning indicator, illuminating while the internal capacitors remain energized and providing a simple visual status check.
Frequently Asked Questions about BLII-D150A:
Q: How many axes can the BLII-D150A servo drive control?
A: The BLII-D150A servo drive supports control of a single axis for precise positioning applications.
Q: What is the power unit capacity of the BLII-D150A?
A: This drive has a power unit capacity of 150 A, allowing it to deliver substantial current to its connected motor.
Q: What type of inverter switch device does the BLII-D150A use?
A: The BLII-D150A utilizes IGBT devices as inverter switches, enabling efficient and reliable power conversion.
Q: How does the BLII-D150A manage regenerative discharge?
A: Regenerative discharge in this model is handled by a resistor block to safely dissipate excess energy.
Q: Does the BLII-D150A have a warning charge indicator?
A: A warning charge indicator LED is provided on the BLII-D150A, alerting users to high voltage presence.
