MAR-M700MFA
Multi-Turn Battery-Free Absolute Encoder
World-First Multi-Turn Battery-Free Absolute Encoder with All-Solid-State Battery
Widely used in industrial machinery, including industrial robots for automotive production lines and machine tools, absolute encoders are sensors capable of detecting the rotational displacement of robot arms and other equipment as absolute values.
The latest model, the MAR-M700MFA, combining high reliability with compact dimensions, features an all-solid-state battery to provide higher guaranteed operating temperatures than conventional external battery-free absolute encoders (equivalent Nikon models), allowing maintenance-free operation. The model also features newly developed predictive maintenance functions and a proprietary angle accuracy self-correction function to expand the scope of applications for industrial robots and other equipment, improve operational stability, and increase motion control precision.
Features
1. World’s-first* absolute encoder with all-solid-state battery Guaranteed maximum operation temperature up to 105°C and maintenance-free operation
Battery-free configuration incorporates all-solid-state battery developed by Maxell Ltd. inside the encoder. This increases the maximum guaranteed operating temperature to 105°C, providing even greater flexibility in motor and equipment design. This also allows maintenance-free operation.
- *As of November 20, 2023, for commercially available multi-turn battery-free absolute encoders (Nikon data).
2. Incorporates predictive maintenance function
The encoder incorporates a new predictive maintenance function based on the compatible communication standard (A-format®)*. This allows early detection of potential failures and provides advance notification of the need for parts replacement and maintenance timing for industrial robots, helping to minimize the risk of sudden failure-induced equipment shutdowns.
- *A-format® is a registered trademark of Nikon Corporation.
3. Incorporates proprietary angle accuracy self-correction function
It also features the proprietary Nikon angle accuracy self-correction function. This allows accuracy corrections without the need for a reference encoder*, helping to ensure improved operational stability and greater motion precision.
- *A master encoder used to ensure the accuracy (position information) of the target encoder
4. Interchangeable with existing models
Interchangeable with existing Nikon absolute encoders, it can be installed without the need to make design changes in mounting parts.
Specifications
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| Model | MAR-M700MFA | |
|---|---|---|
| Resolution | Single-turn | Max. 27 bit (134,217,728 positions/rev.) |
| Multi-turn signal | Max. 16 bit (65,536 revolutions) | |
| Responsive revolution speed | With mains power | 8,000 min-1 |
| With backup battery | 8,000 min-1 | |
| Power source voltage | With mains power | 5 V DC (±10%) |
| With backup battery | － | |
| Current used | During normal operations | 120 mA (TYP) |
| Using external battery | － | |
| Operating temperature range | ‒20 to +105°C | |
| Moment of inertia for shaft | 1.2 × 10-7 kg·m2 | |
| Allowed rotational angular velocity | 1.0 × 105 rad/sec2 | |
| Communication protocol | A-format® | |
| Transmission standard | EIA standard RS-485 compliant | |
| Transmission method | NRZ half-duplex serial communications | |
| Baud rate | 2.5 Mbps (Optional: 4 Mbps to 16 Mbps) | |
| Number of signal wires | 4 | |
| Memory access development space | 3,750 bits (240 × 16 bits) | |
| Temperature sensor | Supported | |
| Bus connectivity | Supported | |
| Bus connectivity options | Encoders can be connected for up to 8 axes. | |
| Dimensions | External diameter (⌀) | 35 mm |
| Height | 12.48 mm (TYP) | |
Dimensional Drawings
