Product Description:

The BLII-D5050A is a servo drive manufactured by Okuma in the BL Servo Drives series. Designed for dual-axis motion modules, it feeds regulated current to matched AC servo motors, enabling precise torque and velocity control in machine tool and general automation equipment. The unit acts as the interface between numerical control commands and motor windings, turning digital position data into three-phase output that governs cutter position, feed drives, or auxiliary axes.

Inside the enclosure, an SVCII board coordinates both axes and shares logic power that arrives through a control circuit rated at single-phase 100 V AC. The power stage is supplied from a three-phase 200 V AC main circuit, which is first rectified by a diode bridge and then switched by an IGBT inverter to create a variable-frequency output. Each axis can deliver up to 50 A of continuous armature current, and an electronic trip disconnects the output at 150% of the current limit to protect the motor windings. Position feedback from an external encoder closes the servo loop, while green, yellow, and red status LEDs report operating, warning, and fault states. The two-axis architecture is built on a single heat sink to save panel space, and a torque monitor jack provides direct analog observation of load.

The drive’s diagnostic connectors scale velocity at ±10 V = ±3750 rpm, allowing oscilloscope readings to be correlated with actual motor speed. A separate output maps commanded torque so that 10 V equals the torque limit under programmed current restrictions. Environmental allowances include vibration up to 0.5 G, continuous ambient humidity to 75% RH, and short-term peaks to 95% without condensation, permitting installation on shop floor machines that cycle through washdown or coolant spray. The vibration limit helps protect the internal power stage from mechanical fatigue, and the humidity range helps prevent tracking on control circuits.