Product Details

AV125

Fit Your Largest Motors, Largest Shaft Applications

  • Heavy Mill Duty
  • Up to 7.88" [200mm] Shafts
  • Up to 8192 PPR
  • Removable Sensors
  • Wide-Gap Technology, No Air Gap Adjustment Required
  • Mounts Securely to Motor
  • Outputs Fully Short Circuit Protected
  • Self-Diagnostic LED & Alarm Output
  • Sealed Electronics
  • -40°C to +100°C Operation
  • 3 Year No-Hassle Warranty
  • Excellent for Brake Applications

AV125 SMARTach™ III heavy mill duty modular magnetic encoders fit 12.5" motor and NEMA brake flanges. Other models, from 115mm to 8.5", are available to fit other motor sizes.

AV125 is ideal for large motor and brake applications where a large diameter through-shaft is needed.  It permits shafts up to 7 7/8" [200mm] to pass through the encoder, facilitating motor-encoder-brake sandwich construction, as well as hollow shafts for water or air cooling systems to pass through the encoder.  Because the AV125 is super-reliable and features removable sensors, you can install it in hard-to-access configurations and locations without risk of downtime.

Quite simply, the AV125 is designed to eliminate encoder failures:  All AV125 electronics are fully encapsulated.  There are no moving wearing parts. AV125 sensors locate over 4X farther from the rotor than the competition; no more sensor/rotor grinding!  Miswiring an encoder is common – and it shouldn’t cost you time or money. The AV125 has full output short circuit and reverse voltage protection, plus surge protection.

The universal 5-24V design drives longer cables and is protected against wiring errors and surges.

Adaptive Electronics: At power-up you know you installed it right! The green LED tells you your AV12 Sensor is aligned with the rotor and reading signal.  If at any time, the AV5 cannot produce consistent signals, the LED changes to red and the optional remote alarm contact activates. However, the encoder keeps working to give you time to schedule service.  Even wiring errors and short circuits that cause an over-temp situation will be detected and indicated by changing the LED to orange. 

Why risk tiny fragile optical encoders perched precariously behind your large motor or brake. Specify a heavy duty AV125 encoder!

Operating Power: (Each Sensor): 5-24V*

Current: 100mA nom, no load
Output Format: A Quad B with marker (A, /A, B, /B, Z, /Z)
Frequency Range:  
     @5V, @1m cable, 250 kHz Max
     @24V, @300m cable, #8 output, 45 kHz Max
Maximum Cable Length: 1000'
PPR: 4 - 50000***
Speed: 5000 RPM Max****
Rotor Positioning: Up to +/-0.100" movement/misalignment
Sensor-Rotor Gap: 0.050", +0.015/-0.040" [1.27mm+0.38/-1.02]
Temperature: -40° to 100°C (rotor -40° to 150°C peak)*
Electronics: Fully Encapsulated, IP67**
Vibration: 18G
Shock: 1 meter drop test
Weight: 15-17 lb. [6.8-8 kg]


* Electrical specifications for SMARTach III model (serial #30,000 or higher), consult Nidec Industrial Solutions for earlier model specifications.
** Certain connector options may reduce IP rating.
***(PPR) Standard maximum PPR is 5000. Consult Factory with your application for PPRs up to 50,000.
**** (Speed) Maximum RPM may be limited for PPR > 2,500. Consult Factory with your application.


All dimensions are in inches [millimeters].
Specifications and features are subject to change without notice.

Northstar/LakeShore RIM1250™ and SL1250™ are trademarks of Dynapar.
Spare sensors, rotors, through-shaft cover plates, and shaft grounding kits can be ordered separately.

Rotors greater than 6.375" [160mm] do not include V-ring seals.

  • SMARTach II sensors find problems before they cause failure
  • Replaces Northstar/LakeShore RIM1250™, NexGen 1250, SL1250™; Avtron M1250 models
  • Resists motor and brake interference noise
  • Reverse voltage protection
  • Mix and match any PPR with any rotor
  • Permits axial movement up to +/-0.100" [+/-2.54mm]

No Related Materials Available

Competitive Products

  • Avtron's AV125 encoders directly replace competitive models, including:


    Lakeshore/Northstar: RIM Tach 1250, RIM 1250, R1, RT1


    And other 12.5" C-face and FC-Face mount encoder models including Avtron's M1250.


    For direct model replacements, try our cross reference page

    or

    Contact Us

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