Mitsubishi OSE104ET Incremental Encoder

The Mitsubishi OSE104ET is a high‑performance incremental rotary encoder designed for precise speed and position feedback in industrial motion control systems. This optical encoder delivers 1024 pulses per revolution (PPR), providing high resolution for accurate servo motor regulation and CNC axis positioning. Its robust mechanical construction and high‑grade optical components ensure long‑term reliability even in environments with vibration, dust, and moderate temperature fluctuations.

The OSE104ET outputs complementary A, B, and Z signals via differential line drivers (RS‑422), ensuring excellent noise immunity over long cable runs—a critical feature for industrial drive systems. The encoder is typically mounted directly on the motor shaft via a flexible coupling or using a dedicated flange, providing a compact and integrated feedback solution. Its operating principle is based on a glass scale and LED light source, delivering consistent output characteristics over the device’s lifecycle.

Technical Specifications

• Encoder type: Incremental, optical

• Resolution: 1024 pulses per revolution (PPR)

• Output signals: A, B, Z (complementary line driver outputs, RS‑422)

• Supply voltage: 5 V DC ±10%

• Current consumption: ≤ 150 mA (typical)

• Maximum frequency response: 200 kHz (per channel)

• Shaft diameter: 6 mm or 8 mm (depending on variant)

• Connection: 12‑pin circular connector or cable output (flying leads)

• Protection class: IP54 (against dust and splash water)

• Operating temperature: -10°C to +70°C

• Storage temperature: -25°C to +85°C

• Maximum shaft speed: 6000 rpm

Key Design Features

• Line driver output (RS‑422): Ensures signal integrity over distances up to 100 meters, immune to common‑mode noise.

• Zero‑index (Z) pulse: Provides a once‑per‑revolution marker for absolute reference, essential for homing sequences.

• High rotational speed capability: Supports speeds up to 6000 rpm, compatible with high‑speed spindle and servo motors.

• Integrated bearing system: Precision bearings minimize runout and extend the operational life of the encoder.

Application Areas

• Servo motor feedback: Directly mounted on Mitsubishi servo motors for speed and position control loops.

• CNC machine tools: Feed axis and spindle velocity feedback.

• Robotics: Joint angle measurement and velocity sensing for articulated arms.

• Industrial conveyors: Accurate speed monitoring and synchronization of multiple driven rollers.

Installation and Cable Connection

Mechanical installation involves sliding the encoder onto the motor shaft and securing it with the provided coupling or clamping flange. Care must be taken to avoid axial or radial force on the encoder shaft during mounting. Electrical connection should be made using shielded, twisted‑pair cables to maintain signal quality. The shield must be grounded at the controller side. Pin assignment for the A, B, Z signals and power supply is detailed in the product datasheet; incorrect wiring may damage the encoder. Periodic inspection of the cable integrity and connector tightness is recommended in high‑vibration applications.

Standards and Compliance

The OSE104ET complies with RoHS directives and meets the EMC requirements for industrial equipment (EN 61000‑6‑2 and EN 61000‑6‑4). It is UL recognized for use in North American markets.

Conclusion

The Mitsubishi OSE104ET incremental encoder is a reliable, high‑resolution feedback device that enhances the performance of servo‑based motion systems. Its robust output drivers, durable mechanics, and precision optics make it an excellent choice for manufacturers seeking consistent and accurate motor control.