Avtron M628A Analog/Magnetic Tachometer

Avtron M628A Analog/Magnetic Tachometer

Setting a New Standard

  • Not recommended for new applications
  • 1 Year No-Hassle Warranty
The M628A is a heavy mill-duty reluctance-type rotary pulse generator for use with Avtron digital measurement systems. It replaces earlier models such as M627 and M627A.
This unit requires no external operating power. A magnetic transducer generates a signal pulse each time a tooth of a rotating steel gear passes its magnetic tip. Coupling the pulse generator to a machine shaft then produces an output frequency directly proportional to the rotational speed of the shaft.

Reluctance pulse generators are not recommended for new applications; encoders provide higher resolution, zero speed output and compatibiity with more new and existing control systems.
Output Waveform: Sine Wave
Output Frequency: 50HZ to 12KHZ (no output at zero speed)
Output Level: 0.5 V P-P min. to 10 V P-P max. (typical) into 2.2 series and 0.01 MFD shunt load
Output Impedance: 600 OHMS
Output Available: Two (D) or four (Q). Outputs are not phase related
Output Connections: 8 inch leads, Conduit entry (MS Connector optional)
Pulses Per Revolution: 240, 320, 360 (Standard)
Operating Speed: 50-5000 RPM
Operating Temp Range: -200 to +850 C
Starting Torque: 3 oz.-in.
Shaft Inertia: 0.38 oz.-in.-sec2
Acceleration, Max.: 5000 RPM/sec
Shaft Loading, Maximum: 15 lbs. Axial, 50 lbs. Radial
Coupling Recommended: Zero backlash, Thomas miniature flexible or equivalent. Where axial endplay exceeds +/-0.020 inch, use Thomas CCX or equivalent
Shaft Extension: Single (Standard), Dual (Optional)
Weight:
  • 13.5 lbs. Single Output
  • 14.5 lbs. Dual Output
  • 4 isolated outputs available
  • Suited to replacement of older reluctance style tachs in mill applications
  • Single or Dual Shaft
  • Shaft Grounding Available
  • Conduit box or MS connector
Industry General Food & Beverage Pulp & Paper Wood Products Wind Power Crane & Hoist Metals Mining Marine Oil & Gas

Light Mill Duty

AV20, AV25, AV6A, AV6M, HS25A, HS35A, HS6A, HS6M, K661, 		                   

Mill Duty

ADDG, HS35M, K661, M185, M3, M3(small), M925, RAHS35M 		                   

Heavy Mill Duty

AV115, AV125, AV45, AV5, AV56, AV56S, AV67, AV85, AV850, HS45, K661, M4, M4(small), M460, M628A, XR115, XR12, XR125, XR45, XR4F, XR5, XR56, XR67, XR85, XR850, XRB1 		                   

Severe Mill Duty

AV12, AV30, AV485, AV5, AV685, HS40, K661, M484, M6, M7, M925, XR12, XR47, XR485, XR5, XR685, XRB1, XT45 		                   
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Product Glossary

  • Coupled/Coupling

    Refers to a flexible device that is used to link a solid shaft encoder to the shaft to be monitored. Avtron strongly recommends isolated, flexible disk style couplings wherever possible to maximize encoder bearing life. For large axial shaft movement, splined couplings should be used.

  • Foot Mount

    Foot Mount encoders are bolted to a motor foot, shelf, or other nearby location. The solid shaft encoder is coupled to the shaft to be monitored. Modern Avtron encoders (AV485) require a separate foot mounting bracket. To eliminate coupling and alignment maintenance issues, foot mounting installations can be upgraded to a hollow shaft encoder such as the AV685.

  • Heavy Mill Duty

    Heavy Mill Duty encoders are designed to withstand temperature cycling, extreme temperatures, contaminants, bearing loads, and physical force.

  • MS Connector

    The most used encoder connector style in North America. Available in 6, 7, and 10 pin versions, with 10 pins being the most common. Avtron offers pin-for-pin exact replacements for competitors’ models using MS connectors. MS connectors are extremely reliable but require soldering. Many users prefer industrial EPIC ® style connectors instead. EPIC® is a registered trademark of the Lapp Group.

  • NEMA 56C

    A NEMA 56C face or flange mount, also known as bearingless or pancake encoder, is a 4.5" flange with (4) bolts located in a 5.88" circle. Originally designed as the standard for mounting solid shaft, coupled tachometers on flange adapters, the NEMA 56C is also a standard for mounting modular encoders. Avtron AV56 THIN-LINE II™ encoders mount on NEMA 56C faces. Marathon Blue Max and Black Max AC motors feature a NEMA 56C face on the non-drive end.

  • Reluctance

    An early style of analog tachometer. It only provides output above a minimum speed. The output is a low power analog sine wave. Avtron offers the M460 reluctance tach, which is not compatible with modern encoders.

  • Solid Shaft

    Solid Shaft encoders are coupled to the shaft to be measured. The solid shaft encoder body is typically C-Face mounted using a flange adapter, or some models can be foot mounted.

  • Wide-Gap Technology

    Avtron encoders use special optical sensors and magnetoresistive sensors, combined with proprietary circuit designs to allow the sensor to be located much farther from the magnetic rotor or optical disk. This eliminates sensor crashes and makes mounting easy and forgiving of mechanical variation.

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