Description
Core Product Summary
The Okuma ER-FC-2048D is an absolute rotary position encoder designed for integration with Okuma BL-series brushless servo and spindle motors. Operating within the Okuma OSP control framework, this multi-turn feedback sensor precisely tracks motor shaft positioning and rotational velocity for high-accuracy machine tool applications.
The unit detects shaft position utilizing internal MPR (magnetic pole rotation) sensors and high-resolution pulse heads. It interfaces directly with the drive system via a ribbon cable connection and mounts securely to the motor shaft utilizing an M5 hexagon socket screw. Built to handle rigorous factory conditions, it provides reliable absolute feedback to prevent axis loss during power interruptions.
Key Technical Specifications
| Specification | Verified Value / Parameter |
| Brand / Manufacturer | Okuma |
| Product Family / Series | OSP Absolute Encoder Series (ER Series) |
| Model / Part Number | ER-FC-2048D ( commonly cross-referenced as EP-FC-2048D ) |
| Encoder Type | Absolute, multi-turn rotary encoder |
| Sensing Method | MPR sensors and pulse heads |
| MPR Pole Count | 8 |
| MPR Excitation | 5 kHz sine/cosine |
| Resolution | Up to 16-bit resolution |
| Data Output | Serial data output |
| Electrical Connection | Ribbon cable connector |
| Mechanical Mounting | M5 hexagon socket screw |
| Compatible Motors | Okuma BL series servo and milling spindle motors |
Detailed Product Overview
The Okuma ER-FC-2048D functions as a core feedback component in closed-loop Okuma CNC machining centers, lathes, and milling systems. As an absolute encoder, it records exact shaft coordinates continuously, eliminating the need for a zero-return (homing) sequence every time the machine tool powers up.
Integration requires careful alignment during installation on the host motor shaft. Because absolute encoders rely on fine magnetic and optical/pulse configurations, technicians must ensure the M5 mounting screw is torqued evenly and the ribbon cable is seated cleanly without pinching or bending stress. Proper signal shielding is essential to protect the 5 kHz sine/cosine excitation and serial communication lines from electrical noise generated by high-frequency PWM servo drives.
ER-FC-2048D
ER-FC-2048D
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| CNC Control Platform | Okuma OSP CNC systems | Ensure parameter matching for multi-turn absolute feedback |
| Compatible Actuators | Okuma BL series AC servo and spindle motors | Verify physical shaft dimensions and pilot alignment |
| Mechanical Fastening | M5 hexagon socket cap screw | Torque securely to prevent slippage under high-acceleration loads |
| Signal Interface | Ribbon cable connector configuration | Handle with care during installation to prevent damage to internal conductors |
| Environment | Enclosed CNC motor housing | Protect from direct coolant immersion, heavy oil mist, and iron particulate buildup |
Dimensions, Mounting & Connection Notes
- Shaft Integration: Mounts directly onto the designated motor rear shaft extension using an M5 internal hexagon socket fastener.
- Signal Transmission: Connects internally via a dedicated multi-conductor ribbon cable interface feeding back to the encoder board or drive processor.
- Handling Precautions: Sensitive electronic components inside require ESD precautions during handling, replacement, or maintenance. Avoid striking the encoder housing to prevent damage to the internal pole alignment.
FAQ
What is the Okuma ER-FC-2048D (EP-FC-2048D)?
It is an absolute multi-turn rotary encoder manufactured for Okuma CNC machine tools, providing precise position and speed feedback for servo and spindle drives.
What type of feedback does this encoder provide?
It provides absolute position data, meaning it retains exact coordinate location even through power loss cycles without requiring an axis homing routine.
Which motors are compatible with this encoder?
It is engineered specifically for use on Okuma BL-series brushless servo and milling motors.
How does the encoder mount to the motor?
The unit mounts directly onto the motor shaft utilizing an M5 hexagon socket clamping screw and interfaces via an internal ribbon cable.
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