ER-FC-2048D Okuma
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The Okuma ER-FC-2048D is an absolute position encoder and part of the Absolute Encoders series. It uses serial data output and MPR with pulse heads as feedback elements, and provides axis speed and position feedback. The encoder supports a clock frequency of 81.92 MHz and allows for a maximum of 2048 revolutions.
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Product Description:
The ER-FC-2048D is an absolute position encoder produced by Okuma and assigned to the Absolute Encoders series. As a feedback element mounted on BL motor shafts, the unit converts mechanical rotation into digital position words that CNC or motion controllers use for closed-loop speed and position regulation. By supplying precise multi-turn data, the encoder allows machine tools and automated axes to maintain commanded paths, detect overshoot, and synchronize coordinated motion without the cumulative error common to incremental devices. This feedback helps the control system maintain accurate axis position during rapid starts, stops, and coordinated contouring.
The internal clock operates at 81.92 MHz, providing the timing reference that governs conversion, serialization, and error checking. For every tenth of a revolution, the sensor generates 16384 clock edges, giving very fine angular resolution across the full turn. Position data leaves the unit through a Serial link, reducing conductor count and simplifying ribbon-cable routing through motor housings. The lowest readable digit is 0.0001, which supports micron-level linear interpolation on finely pitched ballscrews. An input shaft capable of 60 kg/cm static torque couples to the rotor through an M5 hex-socket bolt, allowing the encoder to tolerate rapid accelerations and braking events common in spindle indexing or high-speed tool changers.
Multi-turn tracking is maintained for up to 2048 revolutions thanks to an MPR disc that is excited by a 5 kHz sine and cosine carrier. The disc is subdivided at 36° electrical intervals and uses 8 poles to establish distinct magnetic patterns that the pulse heads read without physical contact. Because the pulse heads read those patterns without contact, wear at the sensing interface is minimized during normal operation. A ribbon cable carries the serial stream to the axis drive, while BL motor compatibility helps keep electrical grounding and mechanical concentricity within the tolerances required by closed-loop machining centers.
Frequently Asked Questions about ER-FC-2048D:
Q: What type of data output does the ER-FC-2048D absolute encoder use?
A: The ER-FC-2048D provides an absolute position signal using a serial data output format.
Q: Which motor types are compatible with the ER-FC-2048D encoder?
A: This encoder is compatible with BL Motors, making it suitable for integration with this motor type.
Q: How many maximum shaft turns can the ER-FC-2048D encoder track?
A: The ER-FC-2048D can record up to 2048 shaft revolutions due to its maximum shaft turns specification.
Q: What kind of interface cable is used for the ER-FC-2048D encoder?
A: A ribbon cable is used as the interface cable for connecting the ER-FC-2048D.
Q: What feedback elements are present in the ER-FC-2048D encoder design?
A: The ER-FC-2048D features MPR + pulse heads as its feedback elements.
