Product Overview: Mitsubishi/Tamagawa OSA 18-130 Encoder
The OSA 18-130 is a high-resolution Absolute Encoder, manufactured by Tamagawa Seiki specifically for Mitsubishi Electric AC Servo Motors. This encoder is the primary feedback device for the HC-series and HA-series motors, providing the servo amplifier with real-time data on the motor’s position, speed, and rotation direction. It is a vital component for high-precision CNC machining, robotics, and automated assembly where sub-millimetric accuracy is required.
Precision Feedback and Signal Integrity
The OSA 18-130 utilizes a 17-bit to 18-bit resolution architecture (depending on the specific motor pairing), allowing it to detect hundreds of thousands of pulses per single revolution. As an absolute encoder, it «remembers» its position even if the power is disconnected, eliminating the need for time-consuming homing routines during machine startup. The encoder features advanced optical sensing technology that is resistant to the electrical noise generated by the high-frequency switching of the servo amplifier.
Key Technical Characteristics
- Part Number: OSA 18-130.
- Type: Absolute Encoder (Optical).
- Resolution: High-resolution digital feedback (131,072 pulses/rev).
- Compatibility: Mitsubishi HC-KFS, HC-MFS, and HC-SFS motors.
- Interface: Serial communication with MR-J2S/MR-J3 amplifiers.
- Housing: Rugged, sealed construction.
- Shaft Type: Hollow shaft / Tapered coupling (Ref. motor).
Industrial Application and Maintenance
The OSA 18-130 is designed to operate in the harsh environment found at the rear of a servo motor. It is built to withstand high temperatures and vibration. In the event of an «Encoder Error» or «Absolute Position Lost» alarm on the Mitsubishi drive, the OSA 18-130 is the primary component to inspect. Its plug-and-play design allows for straightforward replacement, although precision alignment is required to maintain the motor’s commutation angle.
| Feature | Detail |
| Communication Speed | High-speed serial |
| Protection Rating | IP65 (when mounted) |
| Standards | RoHS Compliant |
Frequently Asked Questions
Do I need a battery with this encoder? Yes, to maintain the «absolute» position memory during power-off, a battery must be connected to the servo amplifier. Can I repair the internal glass disk? No, if the optical disk is damaged or dirty, the entire OSA 18-130 unit must be replaced.
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