Description
Core Product Summary
The OKUMA ER-FC-2048D is an absolute position encoder used in OKUMA CNC motion-control systems. It provides rotational position and axis speed feedback for compatible BL servo motor applications, allowing the CNC control to determine motor position for controlled axis movement.
The encoder uses a multi-pole resolver (MPR) and pulse-type sensing elements to obtain position information across different levels of resolution. Its documented interface characteristics include serial data output and a ribbon-cable connection. The encoder’s multi-turn capability is specified as 2,048 revolutions before the count rolls over. For replacement applications, confirm the existing encoder designation, motor configuration, connector arrangement, and CNC control requirements before selecting a replacement.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | OKUMA |
| Model | ER-FC-2048D |
| Product type | Absolute position encoder |
| Application | CNC axis speed and position feedback |
| Compatible motor family | BL servo motors |
| Feedback elements | Multi-pole resolver (MPR) and pulse-type heads |
| Data output | Serial |
| Interface cable | Ribbon cable |
| Maximum revolutions before rollover | 2,048 |
| MPR excitation frequency | 5 kHz sine/cosine |
| MPR phase interval | 36° |
| MPR pole count | 8 |
| Clock frequency | 81.92 MHz |
| Clock pulses per 0.1 revolution | 16,384 |
| Lower-digit position increment | 0.0001 |
Engineering Selection Highlights
- Encoder designation: ER-FC-2048D → Match the complete model number when identifying a replacement.
- BL servo motor application: The encoder is intended for BL motor feedback systems → Confirm the installed motor model and encoder mounting arrangement.
- Absolute position feedback: The encoder supplies position information to the CNC control → Confirm that the machine’s control and feedback architecture support this encoder type.
- Multi-turn tracking: The specified range extends to 2,048 revolutions before rollover → Account for the rollover behavior when assessing the existing machine configuration.
- Serial output: Position data is transmitted serially → Check the existing interface and cable arrangement before installation.
- Resolver-based measurement: MPR feedback supports lower-digit positioning → Preserve the required resolver and control-interface compatibility.
ER-FC-2048D
ER-FC-2048D
Applications & System Role
The OKUMA ER-FC-2048D serves as a feedback component within a CNC servo axis. Its function is to provide rotational position information that the CNC control uses to regulate axis movement.
In the feedback loop, the encoder measures motor rotation and returns position data to the control. The controller uses this feedback when managing commanded movement and coordinating axis operation. The combination of resolver-based lower-digit positioning and pulse-type sensing supports the encoder’s multi-level position measurement architecture.
The encoder’s multi-turn capability is relevant when selecting feedback components for machine axes that require position tracking across multiple motor revolutions. The rollover limit must be considered in relation to the machine’s configured position-reference and feedback system.
For maintenance and procurement, model identification alone is not sufficient to establish interchangeability. The motor type, physical mounting, connector, feedback interface, and CNC control configuration should all match the intended application.
System Compatibility & Integration Requirements
| Item | Compatibility or requirement | Practical note |
|---|---|---|
| Motor system | OKUMA BL servo motor applications | Confirm the specific motor and encoder mounting configuration. |
| CNC control | OKUMA OSP motion-control architecture | Check the installed control and feedback interface. |
| Feedback connection | Ribbon cable | Match the connector and cable arrangement. |
| Position sensing | MPR and pulse-type sensing elements | Confirm the required feedback architecture. |
FAQ
1. What is the OKUMA ER-FC-2048D?
It is an absolute position encoder used for position and speed feedback in compatible OKUMA CNC servo motor systems.
2. Which motor system is the ER-FC-2048D designed for?
It is associated with OKUMA BL servo motor applications.
3. What type of output does the encoder use?
The encoder uses serial data output.
4. What is the maximum multi-turn range?
The specified maximum is 2,048 revolutions before the count rolls over.
5. What feedback elements does the encoder use?
Its feedback architecture combines a multi-pole resolver (MPR) with pulse-type sensing heads.
6. What connection does the encoder use?
The documented interface uses a ribbon cable. The exact connector arrangement should be matched to the installed equipment.
7. What should be checked before replacing an ER-FC-2048D?
Confirm the full part number, motor model, mounting arrangement, connector and cable, and CNC feedback interface.
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