Woodward 9905‑144

Power supply: 18‑40 V DC low‑voltage power input

Actuator output: 0‑200 mA, maximum 7.5 V DC for 35 Ω coil

Load gain maximum: 6 V DC at 5 A CT current

Overall dimension: 387.35 mm W × 180.975 mm H × 63.5 mm D

Weight: 1.134 kg

Protection class: IP20

Shock resistance: 60 Gs

Load‑sharing control accuracy: ±1 %

Supports isochronous constant‑speed mode and droop speed‑droop mode.

Realizes precise load‑sharing for multiple parallel‑running prime‑mover generator sets.

Accepts external 4‑20 mA or 1‑5 V DC remote speed‑setting signal input.

Optional hardware interface for connecting SPM‑A synchronizer module.

Front‑panel potentiometers support on‑site adjustment of gain, speed, load‑sharing and other parameters.

Low‑idle‑speed setting function for stable operation under no‑load condition.

Diesel engine, gas engine and steam‑turbine generator units, marine power stations, industrial emergency power‑supply systems, and multi‑generator parallel power‑generation occasions.

Speed control range: 0‑100 % rated speed.

Working mode switching: hardware‑jumper selection between isochronous and droop mode.

Outer housing: Sheet‑metal metal chassis shell.

Internal hardware: Single‑piece main printed circuit board assembled with analog control circuit components.

Adjustment parts: Multiple front‑panel accessible rotary potentiometers.

Connection parts: Screw‑type wiring terminals for sensor, power supply and actuator wiring.

Sheet‑metal enclosed chassis structure for cabinet‑mount installation.

All adjustment potentiometers are arranged on front panel for convenient on‑site tuning.

Screw‑in terminals on chassis side realize external signal connection.

Compact overall size adapts to standard industrial control cabinet layout.

The controller collects generator speed signal and current‑transformer load signal. Internal analog circuit calculates deviation between actual speed and set speed, and outputs proportional current signal to drive prime‑mover fuel‑control actuator. In multi‑unit parallel condition, it compares each unit load signal to adjust actuator output, balancing load distribution among generators. It supports isochronous mode for constant‑speed single‑unit or isolated‑grid multi‑unit operation and droop mode for infinite‑grid parallel running.

Mount controller inside indoor electrical cabinet; fix sheet‑metal chassis on cabinet mounting rail or back‑plate.

Complete protective ground connection of chassis.

Speed‑sensor signal wire adopts shielded cable; separate signal wire from high‑current power wire.

Reserve surrounding ventilation space for heat dissipation.

All wiring operations must be performed under power‑off state.

When connecting optional SPM‑A synchronizer, strictly follow terminal definition for wiring and use shield‑ground processing.

For forward‑acting control model, actuator potentiometer setting value shall be 10 % higher than nominal‑speed voltage reference value.

Set initial potentiometer position to absolute minimum value before power‑on commissioning.

Adjust gain and stability parameters matching prime‑mover dynamic response characteristics.

Do not operate in environment with heavy dust, corrosive gas and continuous strong vibration.

Regularly inspect terminal screw fastening condition.