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BC42-BC46-BC66 Brushless Tachometer Upgrade

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Replace General Electric BC42, BC46, & BC66 Tachogenerators

General Electric has discontinued their analog tachogenerators including the 5BC42, 5BC46, and 5BC66 units used worldwide in mill applications. Avtron is pleased to offer a complete upgrade package, including modern digital encoders and analog signal generation. This package improves machine accuracy and output while ending costly downtime. No drive or calibration changes need to be made. The AV485 encoder fits the existing bolt pattern (or motor mount) with no machine modification. The K661 signal converter fits inside your drive cabinet and requires very little space. Upgrade your system today, and  assure parts availability for years to come! Also available: 5PY, RE210, AN-DC, and AN-DG upgrade packages.

K661 brushless tachometer with AV850 encoder, AV485 and foot mounted version shown.
BC42/46/66 Replacement

Modular or Solid Shaft 5/8"

BC42, BC46, & BC66 Foot Pattern or Face Mount

Severe Duty

Magnetic Encoder

50/100/200V per 1000 RPM

-40°C* to +100°C*

Tough and Simple!

  • Fits existing BC42/BC46/BC66 bolt patterns for foot mount (coupled or belted), and NEMA 56C face/flowerpot installation
  • No analog drift, no aging effects
  • Potted sensor modules (AV5) are immune to dust, dirt, oil, water, chemicals, etc.
  • Simple sensor mount; no gapping or shimming
  • Severe duty VITON seals
  • No brushes
  • *Standard ratings:
    AV485: -20°C to +85°C;
    AV850: -40°C to +100°C
    K661: (for cabinet mount) 0° to +60°C

Replace Obsolete Tachs!

  • Direct replacement for BC42, BC46, and BC66 tachogenerators
  • Analog output exactly emulates existing output: 50V/1000 RPM, 100V/1000RPM, or 200V/1000RPM
  • Replacement and spare parts widely available & interchangeable with AV485, AV685, & AV850
  • Optional AV850 encoder can be used on GE CD frame DC motors to eliminate couplings, bearings, and all wearing parts
  • Optional encoder air purge permitted for explosive atmosphere applications
  • NOTE: Original tach cable must be replaced using modern twisted pair cable
  • NOTE: Customer must provide 110VAC in the control panel for circuit power.
* Upgrade Package
* AV485 Instruction Sheet
* K661 Instruction Sheet

Standard model available in 5-10 days!
Request same-day shipment!


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