Product Description:

The E4809-045-084-B is a printed-circuit assembly produced by Okuma for the E4809 CNC Boards series. It functions as an interface and regulation layer between the numerical control and the VAC-1 drive family, allowing spindle or axis current to be shaped in accordance with command signals issued by older CNC cabinets. Within an automation rack this part occupies the uppermost slot, where it receives logic-level instructions and distributes conditioned feedback to maintain closed-loop speed or position control on DC servo and spindle modules.

This assembly is classified as a BL-ACT SP Board, indicating that its discrete and analog traces are routed specifically for brushless actuator spindle regulation. Its mounting location is the Top Board in a multi-layer card stack, which simplifies signal routing by isolating low-level reference traces from high-current planes underneath. The control scheme is identified as Old (SCR); therefore, firing angles for the silicon-controlled rectifiers are generated on the card itself rather than in the drive, a requirement for legacy VAC-1 cabinets. Drive compatibility is limited to VAC-1 D11 and VAC-1 D22 converters, so parameter sets on those rectifiers align with this board’s scaling factors. Trim functions are provided by 3 potentiometers, allowing adjustment of gain, offset, and current limit on the board.

Additional configuration is handled through 4 switch banks that select reference voltage ranges, tachometer polarity, and fault response modes. The board was engineered by Okuma for the Drives-DC Servo-Spindle-PCB class, ensuring that its copper thickness, dielectric spacing, and component layout follow the company’s drive-control guidelines. Despite its separate signal and power sections, the card weighs only 4.15 lb, enabling quick removal during maintenance or retrofits without imposing excessive stress on the backplane connectors.