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Cummins Onan UR — VOLTAGE REGULATOR ADJUSTMENTS

For the Cummins Onan UR.

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Procedure

  1. 1. Check all modifications, repairs, and replacements performed since the last satisfactory operation of the set to ensure that all generator leads are cor- rectly connected. A loose wire connection over- looked when installing a replacement part could cause problems, as could an incorrect connection, an opened circuit breaker, or a loose connection on a printed circuit board. A thorough visual check can quickly eliminate these potential problems.
  2. 2. Visually inspect the components of Voltage Regula- tor VRAS-2. Look for dust, dirt, or moisture and cracks in the printed solder conductors. Burned resistors and arcing tracks are readily identifiable. Do not mark on PC boards with a pencil; graphite I lines conduct and can cause leakage or short cir- cuits between components.
  3. 3. Visually inspect the exciter rotor assembly for burned components, broken wires, loose connec- tions, and carbon tracks caused by arcing between parts or between parts and ground. Also check for shorted paths between terminals caused by dust, dirt, and moisture. I I ~ Unless absolutely sure that panel instruments are accurate, use

Source: manual:Stamford UR Alternator Service Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.