E4809-045-071-A Okuma
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The Okuma E4809-045-071-A is a CNC board from the E4809 CNC Boards series designed for 3-phase input voltage of 200 to 220 V AC and input frequency of 50 or 60 Hz. It features regenerative braking, supports two feedback loops with a current transformer for current feedback, and uses a tachogenerator for speed feedback. The board is suitable for motors with a capacity of DC 22 or 15 kW and offers a spindle feedback system using an optical pulse generator.
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Product Description:
The E4809-045-071-A control board is manufactured by Okuma and belongs to the E4809 CNC Boards series. Installed inside a machine-tool drive cabinet, this board coordinates power conversion and feedback processing for the connected spindle and axis drives. It helps those drives maintain commanded speed and torque during automated machining, including cutting passes, rapid moves, and spindle orientation tasks. Because it handles both power-stage control and motion feedback, it supports stable operation across changing load conditions.
The board uses regenerative braking to return excess kinetic energy to the supply, which helps limit heat during dynamic stop cycles. Its power section uses a full-wave back-to-back topology, allowing bidirectional power flow while keeping commutation ripple low. Incoming mains are accepted at 200/220 V AC on a 3-phase line, so the unit can connect directly to common factory feeders. Frequency compatibility of 50/60 Hz allows operation on either standard industrial grid without an external frequency converter. For cutting heads and rapid-traverse axes, the board can drive a combined load of DC 22/15 kW, indicating the continuous and short-term power available without exceeding thermal limits.
The control section uses 2 independent loops to supervise current and speed, which helps reduce overshoot during tool changes and speed transitions. Phase current is sensed by a current transformer, providing galvanic isolation between the logic and power sections and helping protect low-voltage circuitry from the higher-energy power stage. Rotor speed is measured with a Tachogenerator (TG), while spindle position is updated through an Optical Pulse Generator. These feedback devices supply the analog and digital signals needed for vector calculation, spindle orientation, and coordinated axis motion. A TG sensitivity of 20 V/1000 rpm links feedback voltage directly to rotational speed, which supports stable low-speed threading and accurate speed regulation under varying load.
Frequently Asked Questions about E4809-045-071-A:
Q: What type of braking method does the E4809-045-071-A support?
A: This board utilizes regenerative braking for efficient energy dissipation during operation.
Q: What input voltage and phase requirements does the E4809-045-071-A have?
A: The E4809-045-071-A supports a three-phase input with a voltage range of 200/220 V AC.
Q: What is the motor capacity supported by the E4809-045-071-A board?
A: Motor capacity for this board is rated at DC 22/15 kW, supporting high power motors.
Q: What type of speed feedback does the E4809-045-071-A use?
A: Speed feedback is provided via a tachogenerator (TG) interface.
Q: How many feedback loops are equipped on the E4809-045-071-A?
A: This model features two feedback loops for enhanced control precision.
