E4809-747-005-D Okuma
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The Okuma E4809-747-005-D is a top board used in the E4809 CNC Boards series, functioning as a firing card with thyristor control technology. It controls DC motors as an axis drive with a 300 Vdc DC bus voltage and receives input power from a 220 VAC 3-phase source. The board supports both D6 absolute position encoder feedback and tachometer speed feedback using pulse phase shifting.
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Product Description:
The E4809-747-005-D is a printed-circuit assembly produced by Okuma for the E4809 CNC Boards series. Positioned as the top board within an axis-drive rack, it works as part of the machine-tool control chain by shaping gate signals for a DC servo amplifier. Within an automated cell, this board links numerical control commands to power modules so that programmed tool paths are converted into regulated armature current and velocity profiles on the associated axis. Its location in the rack also lets it exchange control information with adjacent boards while remaining easy to access during service.
The board is supplied from an industrial mains source of 220 VAC 3-Phase; its rectifier stage generates a bus potential of 300 Vdc that is later modulated. Switching is handled through thyristor devices, and firing pulses are timed by a pulse phase shifting method that staggers conduction angles to limit harmonic content while maintaining torque response. Rotational speed is closed-loop because the drive accepts a tachometer voltage proportional to motor speed, allowing the control card to correct the error between commanded and actual velocity. These power and feedback paths support precise adjustment of current rise times and acceleration profiles under changing tool loads or feed rates.
The card’s logic section also issues enable and inhibit gates that identify it as a firing card for a brushed DC motor acting on the commanded slide or spindle. Positional accuracy is secured by a D6 Absolute Position Encoder that supplies parallel words directly to the controller, eliminating homing moves after power cycles. Within the servo hierarchy, the board carries the Axis Drive role, translating encoder data and speed feedback into phase-aligned gate commands while coordinating with other motion channels. Mounted as the top board, it remains accessible for diagnostics without disturbing lower boards in the rack, which helps reduce interruption to machine operation.
