SLIM Tach SL56

SLIM Tach® SL56 Rotary Encoder

 SLIM Tach SL56
RIM Tach 1250

Quick Specs...

  • Thin, compact, and only 0.75 inch thick
  • Mounts to 4.5 inch 56 C-Face motors
  • Rugged, reliable magnetoresistive sensor technology
  • Easy installation with no brackets or couplings
  • Hard, anodized aluminum construction
  • Single or dual sensor outputs available

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Overview Industry/Application Specifications Related Info  

Overview / Design Principle:

This reliable encoder may be configured with one or two electrically independent and totally isolated outputs. A high temperature version is available to meet operational needs up to 120° C. It also comes in a wide variety of shaft sizes, cover choices, and connector options.

The durable SLIM Tach® SL56 operates with unequalled resistance to grease, oil, salt water, dirt, fibers, and dust. Its hardened, encapsulated electronics make it immune to contamination, heavy machine vibration, and accidental impact, decreasing downtime. Hard, anodized aluminum of aircraft quality makes the SL56 the toughest, yet lightest, C-Face encoder available. A high power line driver comes standard and guarantees clean, crisp signals over long cable lengths, minimizing the need for signal repeaters.

Each version of the SLIM Tach® SL56 is easy to mount, requiring no bearings, adapter plates, or flexible couplings. Because the SL56 occupies only 0.75 inch of the motor shaft length, a brake, pulley, gear box, or coupling can also be placed on the shaft. The sandwich version provides double CFace mounting for applications which need the encoder between the motor and another device.

There are no bearings to fail or requirements for flexible couplings because its magnetized drum assembly is attached directly to the shaft. The mill duty latching connectors are are easy to wire with no need to field solder or to struggle with a crimp pin.

Features and Benefits:

  • Thru-shaft-shaft versions are standard; double C face sandwich version is also available
  • 64, 128, 256, 512, 1024, or 2048 pulses per revolution (PPR) with optional index pulse
  • 5-24VDC operation, bi-directional quadrature signals with high power, differential line driver outputs


The bearingless, heavy duty, NorthStar SLIM Tach® SL56 mounts directly to 4.5 inch 56 C face motors. With resolutions up to 2048 PPR, it is only 0.75 inch thick and ideal for tight machine configurations.

Standard Operating Characteristics
Code: Incremental
Pulses per Revolution: 60-2048
Phasing Sense: A leads B for Counter-Clockwise rotation (CCW) viewing encoder-mounted end
Quadrature Phasing: 90° ± 22°
Symmetry: 180° ± 54°
Index: 270° gated to falling B edge
Number of Output Modules: Single or Dual Redundant

Input Voltage Requirement: 5-15 or 5-26 Volts DC
Current Requirement: With Electrical Option L or H: 45 mA typical per sensor module plus line driver load
With Electrical Option V or 5: 65 mA typical per sensor module plus line driver load
Output Signals: With Elec Option L or H: 5-15 V Line Driver, 150mA
With Elec Option V: 5-26 V Line Driver, 100mA
With Elec Option 5: 5V Line Driver, 150mA
Frequency Response: 0 - 120kHz Data & Index
Electrical Immunity: 2kV ESD, Reverse Polarity, Short Circuit
Connector: 10 pin industrial duty latching, sealed NEMA 4 &12, IP65; MS connector or pig-tail

Shaft Speed: 5,000 RPM
Mounting Configuration: 4.5” 56C face mount for NEMA MG1 standards
Housing Material: Cast Aluminum
Acceleration Rate: 12,000 rpm/sec max
Shaft Length Required: 0.7” min
Allowable Shaft End-Play: ± 0.045”
Allowable Shaft Runout: 0.002” TIR

Operating Temperature Range: Standard: -40°C to +90°C
Extended: -40°C to +120°C
Storage Temperature Range: -40°C to +120°C
Humidity: to 98% RH (non-condensing)
Shock (Sensor Module): 1 meter drop test, 30 G’s Min
Vibration: 18 G’s @ 5-2000 Hz spectrum

Available Specifications:

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