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Rotary Encoder – MITSUBISHI TT-A-11
The TT-A-11 is a rotary encoder (“Rotary Encoder”) manufactured by Mitsubishi Electric, used as a feedback component in Mitsubishi MELDAS CNC systems and MELSERVO series servo drives. It provides the angular position and speed signal to the controller, enabling closure of the position and velocity control loops. The unit is compatible with Mitsubishi servo drive units and is documented as a feedback component on various CNC machine tools.
The encoder is the feedback sensor that communicates the precise angular position and speed of the axis or motor to the CNC: without it the control loop cannot be closed and the axis becomes uncontrollable. A faulty encoder or one generating incorrect signals causes immediate alarms on the CNC, positioning errors, or irregular axis behaviour that can damage the workpiece or the machine itself.
Mitsubishi Electric is one of Japan’s leading industrial automation conglomerates, offering a complete range of CNC controllers (MELDAS/M700 series), servo drives (MELSERVO MR-J series) and motors for machine tools. Products in the TT series are legacy / discontinued: replacement is typically carried out using OSA/OSE series encoders or compatible equivalents available from specialist suppliers.
Main Technical Specifications
| Type | Incremental rotary encoder (Rotary Encoder) |
| Part number | TT-A-11 (TTA11) |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi MELDAS CNC systems; MELSERVO servo drives |
| Function | Angular position and velocity feedback for control loop closure |
| Supply voltage | 5 V DC (typical) |
| Resolution | ~2,000–10,000 pulses/rev |
| Output signal | Quadrature pulses (A, B, Z) differential RS-422 (typical) |
| Interfaces / connectors | Multi-pin connector compatible with MELSERVO drives |
| Weight | ~0.2–0.5 kg |
| Dimensions | diameter ~50–80 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
Optical Serial Encoder – MITSUBISHI OSE105S2
The OSE105S2 is an optical serial rotary encoder (“Optical Serial Encoder”) manufactured by Mitsubishi Electric, designed as a feedback device for HC-series servo motors (HC-KFS, HC-MFS, HC-SFS) paired with MELSERVO MR-J2S servo amplifiers and MELDASMAGIC / MELDAS CNC systems. The device transmits rotor angular position and speed signals to the servo amplifier via Mitsubishi’s proprietary serial protocol. Available as a standalone unit for direct shaft mounting; encoder cable not included.
The position encoder is the sensor that closes the servo amplifier’s feedback loop: it transmits the motor’s angular position and speed in real time, allowing the controller to instantly correct any position or speed error. Without it, the servo amplifier triggers an encoder alarm and disables the motor; incorrect or missing feedback causes loss of positional accuracy, axis vibrations, and potential machine collisions.
Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation and CNC systems, covering the MELSERVO (servo drives), MELDAS / MELDASMAGIC (CNC controllers) and MELSEC (PLC) product lines. HC-series motors paired with MR-J2S amplifiers are legacy / discontinued: superseded by the MR-J3, MR-J4 and MR-J5 platform; OSE encoders for these motors are available exclusively as used, surplus or original warehouse stock.
Main Technical Specifications
| Type | Optical serial rotary encoder (Optical Serial Encoder) |
| Part number | OSE105S2 |
| Brand | Mitsubishi Electric |
| Known application | HC-KFS, HC-MFS, HC-SFS servo motors – MELSERVO MR-J2S amplifiers; MELDAS / MELDASMAGIC CNC systems |
| Function | Rotor angular position and speed feedback for servo amplifier |
| Resolution | 131,072 pulses/revolution (17-bit) – typical Mitsubishi OSE series |
| Supply voltage | 5 V DC (±5 %) |
| Output signal | Serial – Mitsubishi proprietary protocol (SSE) |
| Connector | Dedicated Mitsubishi encoder connector (6-pin, typical) |
| Operating temperature | 0 – 55 °C (typical) |
| Weight | ~0.2–0.4 kg |
| Dimensions | Ø ~60–80 mm × length ~40–60 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |