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The (and its variant AN-5-203R ) is a specialized automatic voltage regulator (AVR) primarily used in Denyo diesel generators like the DCA-13ESK, 15ESK, and 25SPK series . It is designed to maintain a stable 400VAC output for three-phase systems . Wiring and Connection Guide an-5-203 avr wiring diagram pdf
If your generator is experiencing uneven phase voltage or low output, check these areas on the AN-5-203: Do not trust random JPEGs on forums