E4809-045-019-D Okuma
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The Okuma E4809-045-019-D is part of the E4809 CNC Boards series and is designed for DC spindle motors with regenerative braking. It supports input voltages of 200 to 220 V AC, operates at 50 or 60 Hz, and uses a thyristor speed control method. The board features a 3-phase full-wave back-to-back power circuit and provides both current transformer current feedback and tachogenerator speed feedback.
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Product Description:
The E4809-045-019-D is a spindle-drive control board produced by Okuma within the E4809 CNC Boards series. It conditions commands and feedback for a DC spindle motor, providing the primary conversion stage that lets the numerical controller vary spindle speed during turning, boring, or milling. By placing firing logic, diagnostics, and protective circuitry on a single printed board, the module minimizes cabinet wiring and keeps related control functions on one assembly. It occupies a single slot in the drive rack and uses standard Okuma edge connectors for power and signal exchange.
The board accepts a three-phase supply of 200/220 V AC at 50/60 Hz. Incoming power is processed by a three-phase full-wave back-to-back bridge that establishes bidirectional armature current for rapid speed changes. Output magnitude is governed by thyristor speed control; altering the SCR firing angle adjusts effective spindle voltage without mechanical contactors. System isolation relies on a single AFC20, 600 V, 20 A main fuse, while three 0.5 A NO1065 control fuses protect the logic section. These elements regulate current to the connected motor and help prevent overcurrent faults during heavy cutting.
Energy generated when the spindle decelerates is returned to the supply line through regenerative braking, reducing resistor heat and shortening cycle times. Accurate velocity feedback comes from a tachogenerator (TG) mounted on the motor shaft, while armature load is supervised by a current transformer (TC) that feeds a closed-loop regulator on the board. Four fault-status red LEDs illuminate whenever overspeed, overcurrent, or fuse loss is detected, providing immediate visual indication of a fault. These feedback and braking functions help the board maintain speed linearity during tapping, threading, and spindle orientation sequences.
Frequently Asked Questions about E4809-045-019-D:
Q: What type of alarm indicator does the E4809-045-019-D CNC board use?
A: This model features red LED alarm indicators for quick fault identification.
Q: Which braking method is used in the E4809-045-019-D CNC board?
A: Regenerative braking is utilized on this CNC board for managing spindle deceleration.
Q: What is the required input voltage for the E4809-045-019-D board?
A: The board operates on an input voltage of 200/220 V AC.
Q: What control type is implemented in the E4809-045-019-D for speed adjustment?
A: A thyristor speed control method is used for adjusting the spindle motor’s speed.
Q: What type of motor is the E4809-045-019-D CNC board compatible with?
A: This board is designed for use with a DC spindle motor.
