Danaher / Dynapar / North Star SLIM Tach SL85 Magnetoresistive Encoder

The Danaher / Dynapar / North Star SLIM Tach SL85 is a magnetoresistive encoder delivering zero-speed feedback and precise position sensing for AC vector motor applications. Its bearingless design and magnetoresistive sensing technology eliminate susceptibility to contaminants—grease, oil, salt water, dirt, fibers, and dust—removing the need for protective sealing. The encoder mounts directly onto 8.5″ (180 C) NEMA MG1 standard face motors with a slim 1.250″ profile, requiring only 1.0″ minimum shaft length.

## Technical Specifications

**Sensing Technology**
• Magnetoresistive, zero-speed capable
• Bi-directional quadrature output (A, B, A&B complements)
• Optional Index pulse (Z) at 270° (ungated or gated to falling B edge)

**Resolution & Accuracy**
• Available resolutions: 64, 128, 256, 512, 512Z, 1024, 1024Z, 2048, 2048Z PPR
• Quadrature accuracy: 90° ± 22°
• Symmetry: 180° ± 54°
• Frequency response: DC to 120 kHz maximum
• Duty cycle: 50% ± 15%

**Electrical**
• Supply voltage: 5–15 VDC (5–26 VDC for IC-WE output)
• Current consumption: 45 mA typical per sensor module plus line driver load
• Line driver outputs: 150 mA sink or source capability (4428 and IC-WE options)
• Reverse polarity protection and short-circuit protection
• EN61326-1 noise immunity compliance

**Mechanical**
• Bore sizes: 5/8″ to 3.75″ (custom configurations 0.500–3.750″)
• Maximum shaft speed: 5,000 RPM
• Allowable shaft end-play: ± 0.050″
• Shaft runout: 0.003″ TIR maximum
• Acceleration rate: 3600 rpm/sec maximum
• Housing: Cast aluminum; weight 9.2 lbs

**Environmental**
• Operating temperature: -40°C to +90°C (extended to +100°C for select electrical options)
• Storage temperature: -40°C to +120°C
• Humidity: Up to 98% RH (non-condensing)
• Shock: 30 G’s minimum

## Key Features

• Bearingless design eliminates maintenance and seal failure modes
• Dual-C-Face versions enable sandwich mounting configurations
• Higher resolution capability than traditional gear tooth ring kits
• Direct motor face mounting minimizes external footprint
• Differential line driver outputs for noise-immune long-run installations

## Typical Applications

AC vector motor speed and position feedback in industrial drive systems, conveyor controls, and precision motion applications requiring contaminant immunity and compact mounting.

## Compatibility & Integration

Designed for 8.5″ (180 C) NEMA MG1 face motor mounting. Shaft end-play tolerance ± 0.050″ and runout 0.003″ TIR required for proper operation.