BL3-D Okuma
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The Okuma BL3-D is an AC servo drive in the BL Servo Motors series. It operates with an input voltage range of 170 to 242 V AC and supports input frequencies of 50 or 60 Hz. This axis drive unit has a unit capacity of 75 Amps and is equipped with control and motor connectors identified as CN10 and CN1.
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Product Description:
The BL3-D is an axis drive unit produced by Okuma as part of the BL Servo Motors series. In a machining cell, it sits between the CNC control and the motor, converting logic-level commands into three-phase power that governs speed, torque, and position on a single mechanical axis. By coordinating feedback with pulse-width-modulated output, the drive maintains the motion accuracy needed for tool changing, contour milling, and high-speed positioning in industrial automation.
This unit accepts a mains span of 170 to 242 V AC, so it can operate from standard factory distribution without a dedicated transformer. Its input frequency tolerance of 50/60 Hz allows the same hardware to run on either regional grid standard. The power stage is rated for a continuous 75 A, so it can deliver substantial current to the motor during acceleration and stall conditions. Incoming power is landed on the R/S/T terminals, which keeps the three mains connections clearly separated. A separate low-level supply enters through the CN10 (XB-DCPS) control-power connector, allowing the logic circuits to remain energized for diagnostics even when the main bus is locked out.
The motor’s three-phase leads are routed to the drive through the CN1 (XB-MTR) plug, which provides a keyed interface that helps prevent phase reversal during installation. Dynamic-braking hardware is linked by the CN20 (XB-DBR) jumper connector so regenerated energy can be shunted to a resistor bank instead of the DC bus. Parameter changes are handled with the front-panel SW1 to SW6 switch bank, which provides fixed binary selections for functions such as gain scaling or alarm masking. Real-time status is available on the M1/M2/M3/M4/IU/IV/VDC monitor terminals, allowing direct observation of motor current, DC-bus voltage, or phase balance without opening the control loop.
Frequently Asked Questions about BL3-D:
Q: What is the acceptable input voltage range for the Okuma BL3-D drive?
A: The BL3-D operates with an input voltage range of 170 to 242 V AC.
Q: What input frequencies are compatible with the BL3-D axis drive unit?
A: This model supports an input frequency of either 50 Hz or 60 Hz.
Q: What is the capacity rating for the Okuma BL3-D drive unit?
A: The unit has a capacity of 75 A, accommodating demanding applications.
Q: Which connector is designated for control power on the BL3-D?
A: For control power, the BL3-D uses the CN10 (XB-DCPS) connector.
Q: What input terminals does the Okuma BL3-D utilize?
A: The drive accepts input connections through R, S, and T terminals.
