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OKUMA BDU Servo Drive Card
Brand: OKUMA -
Cat: Card
Code:E4809-032-498-B
| Combination name | Availability | Price |
|---|---|---|
BDU Servo Drive Board (Base Drive Unit) – OKUMA E4809-032-498-B
The E4809-032-498-B is a BDU servo drive board (“Base Drive Unit”) manufactured by OKUMA, a key component of the integrated servo drive system fitted to OKUMA OSP (Open System Platform) CNC machining centres and lathes. The board manages the base drive stage of the servo amplifier: it generates PWM signals for the power stage (IGBTs) and closes the current regulation loop on the motor. It is documented on machines in the OKUMA MA, MB, MH (machining centre) and LB, LU (lathe) series equipped with OSP-5020L / OSP-7000L controls. The part number belongs to the standard OKUMA nomenclature for the E4809 family, reserved for electronic boards within servo and spindle drive assemblies.
The BDU board is the electronic module that converts the torque and current commands from the CNC controller into gate-drive signals for the servo power stage IGBTs. Without it the controlled axis or spindle loses its drive entirely: the machine triggers an immediate alarm and no controlled movement is possible. A BDU failure typically presents as overcurrent alarms, loss of feedback, or failure to enable the axis.
OKUMA Corporation is a Japanese CNC machine tool builder founded in 1898, specialising in lathes, machining centres, and grinding machines together with its own OSP (Open System Platform) CNC control system. OKUMA is one of the very few manufacturers worldwide that vertically integrates the design and production of the machine, the CNC, and the drives in-house. Products in the E4809 series belong to earlier OSP generations and are legacy / discontinued: available only as used, NOS, or through specialist repair services.
Main Technical Specifications
| Type | Servo drive board BDU (Base Drive Unit) |
| Part number | E4809-032-498-B (E4809032498B) |
| Brand | OKUMA Corporation (Japan) |
| Known application | OKUMA CNC machining centres and lathes with OSP-5020L / OSP-7000L control (MA, MB, MH, LB, LU series) |
| Function | Base drive of servo power stage (PWM generation, current loop) |
| Logic supply voltage | ±15 V / +5 V DC (typical for E4809 series) |
| Drive signals | PWM on IGBT / power transistor gates (typical) |
| Interfaces / connectors | Edge / flat-cable connectors to OSP control board and power stage |
| Feedback | Current signal from shunt resistors / Hall sensors on power stage |
| Weight | ~0.3–0.8 kg |
| Dimensions | ~150–260 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |
