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DC drive failure
Vol. 24 #1, March 1997

The sudden appearance of high fre quency vibration on an extruder can result from various causes, but one of the most common, but most difficult to diagnose, is a DC drive controller failure where one SCR fails or misfires, creating a chopped, or pulsed, output to the motor.

This condition often requires a scope and a trained drives technician to diagnose.

- Bill Kramer, American Kuhne Corp.

See also:
  • Broken couplings
  • Brush wear forecasting
  • Drive motor start up
  • Power factor
  • Threaded commutators

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