This automatic voltage regulator (AVR) is designed for PMGexcited generator sets and parallel operation. It provides precise voltage control, protection features, and adjustable settings needed for reliable performance in industrial, marine, and standby power applications. Key benefits Accurate voltage regulation: +/1% RMS regulation when used with 4% engine governing for stable output under load changes. PMG compatibility: Dedicated 3phase PMG power input supports wide PMG voltage and frequency ranges for modern alternator designs. Parallelready functionality: Built for use in parallel operation with adjustable droop and trim functions to balance multiple units. Protection and reliability: Softstart voltage ramping reduces inrush stress; under frequency rolloff protection and overexcitation indicators enhance safety and prevent damage. Easy adjustment and integration: External voltage trim +/10% via a 1 k ohm, 1 watt trimmer and adjustable EXC TRIP, DIP, TRIM, and DROOP controls let technicians finetune performance on site. Key functions and indicators Adjustable EXC TRIP, DIP, TRIM, and DROOP settings for load sharing and transient response tuning. Soft start voltage ramping to limit startup stress on excitation and generator components. Under Frequency Roll Off protection to reduce excitation when frequency falls below set thresholds. UFRO Over Excitation LED indicators for clear visual status of overexcitation events. Sensing input for generator voltage measurement and control. Electrical specifications Sensing input: 190264 VAC, single phase, 2 wire; frequency 5060 Hz nominal. PMG power input: 170220 VAC, 3 phase, 3 wire; continuous current 3 A per phase; frequency 100200 Hz nominal. Output: maximum 120 V DC. Output current: continuous 2.7 A DC; intermittent 6 A for up to 10 seconds. Output resistance: minimum 15 ohm. Voltage regulation: +/1% RMS with 4% engine governing. Voltage buildup: residual voltage at AVR terminal less than or equal to 5 VAC to improve buildup reliability. External voltage adjustment: +/10% range using a 1 k ohm, 1 watt trimmer. Performance and compatibility notes Designed for generator sets using PMG excitation systems and for installations where multiple units operate in parallel. Continuous and intermittent current ratings allow short bursts of higher excitation for transient response while protecting the regulator during sustained operation. Minimum output resistance requirement ensures correct loading and thermal performance. Practical applications Industrial prime power: Use with factory and site generators to maintain tight voltage regulation during variable industrial loads and when paralleling multiple units. Emergency and standby power systems: Provide reliable excitation and controlled voltage buildup for backup generators in critical facilities. Marine and mobile power: Integrate with PMGequipped alternators on vessels and mobile generators where compact, adjustable voltage regulation and protection are required. What to expect in installation Connect sensing input to the generator singlephase output within 190264 VAC. Supply PMG power input with a 3phase source between 170220 VAC and ensure PMG frequency is within 100200 Hz nominal. Set external trim and DROOP as needed for desired steadystate voltage and load sharing behavior. Verify residual AVR terminal voltage is below 5 VAC to confirm reliable buildup. This AVR provides precise regulation, PMG support, and adjustable controls required for modern generator applications where stable voltage, protection, and parallel operation are critical.