Core Features and Application Domain
The 2301A 9905-026, of Woodward's standard 9905/9907 series, is an electronic governor for speed and load control on diesel, gas, steam, or turbine-driven generators. This low-voltage model (20–40 Vdc, <15 W) supplies 0–200 mA to a single forward-acting actuator, driving the fuel rack to minimum upon power loss, a critical safety feature. The sheet-metal chassis (15.25 x 7.12 x 2.5 in, ~4 lbs) fits standard cabinets. The controller supports isochronous (constant speed) and droop (speed falls with load) modes, allowing stable isolated or grid-paralleled operation. Operators select speed ranges from 500 Hz to 12 kHz via an internal switch, accommodating diverse gear configurations. Protections include failed-speed-signal shutdown and an adjustable start-fuel limiter to optimize cranking and reduce emissions.

Installation and Field Calibration
Installation demands shielded wiring for the magnetic pickup (terminals 28/29, min 1 Vrms), PT inputs (90–240 Vac on terminals 1–3), and CT connections (5 A nominal). The droop and breaker auxiliary contacts (terminals 14 and 16) select isochronous or droop behavior. Initial settings put RATED SPEED at minimum, GAIN and RESET mid‑range, RAMP and LOW IDLE at maximum, DROOP at zero, and ACTUATOR COMP at 2 (diesel) or 6 (carbureted/steam). During commissioning, increase GAIN until actuator voltage shows slight instability, then back off; adjust RESET to minimize overshoot under step‑load changes. ACTUATOR COMPENSATION trims residual slow‑periodic oscillations preserving dynamic response.

Load Sharing, Droop, and Practical Deployment
The 2301A excels in multi‑generator paralleling via its internal load‑matching circuit, computing real power from three‑phase CT/PT inputs. The LOAD GAIN pot is set to 6.0 Vdc at full load, assuring proportional sharing across units of differing capacities. For droop against an infinite bus, calculate no‑load frequency (e.g., 61.8 Hz for 3% droop at 60 Hz) and adjust the DROOP pot under load. A systematic phase‑correction routine tests each CT across all three input pairs, selecting the connection yielding the highest positive load‑signal voltage – eliminating unstable power‑factor sensitivity. Additional interfaces include remote speed trim (100 Ω pot, terminals 23/24), idle/rated ramp (terminal 19), and SPM‑A synchronizer support (terminals 25/26).

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