E4809-770-013-A Okuma
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The Okuma E4809-770-013-A is a SVC Drive Board from the E4809 CNC Boards series, designed to work with amp classes of 30A, 50A, and 75A. It supports feedback from an absolute position encoder for speed and position, and operates with a DC bus voltage of 300 VDC while handling a 3-phase 220 VAC input. The board can drive one brushless motor and supports up to six drive amplifiers.
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Product Description:
The E4809-770-013-A is an SVC drive board manufactured by Okuma for the E4809 CNC Boards series. Within a CNC cabinet, this board occupies the SVC slot of the spindle-servo power assembly, where it conditions the DC link and issues gate commands for one brushless axis motor. Working with the base unit and BDC logic section, it forms part of a three-section amplifier stack that delivers controlled torque and position regulation to machine-tool axes. This arrangement centralizes power conversion, command processing, and motor control within the amplifier assembly.
The power interface receives a three-phase 220 VAC feed through the printed-circuit bus bars, and this input is rectified to a regulated 300 VDC link that supplies the drive modules. The available current ratings are 30 A, 50 A, and 75 A, allowing the board type to support a range of spindle or axis loads. Internal comparators trip if the link exceeds the 430 VDC high-voltage threshold or falls below the 220 VDC low-voltage limit, initiating a controlled shutdown during supply anomalies. The connected DC power supply can support six drive amplifiers, while seven status LEDs on the supply indicate bus health, phase loss, and fault conditions. Three TAM transformers mounted on the card isolate the auxiliary control rails from the main bus.
Control data reaches the board as a digital RCON command stream, which the logic gates translate into phase-correct firing pulses. Closed-loop operation relies on an absolute position encoder, enabling simultaneous speed and position feedback without requiring a homing move. A bank of 10 status LEDs on the SVC section indicates ready, run, overcurrent, and feedback error conditions. A DIP switch group at the SW7 location on the lower BDC board adjusts gain and filter settings. The base, BDC, and SVC amplifier sections work together to control the connected motor according to commands received from the CNC system.
