Woodward 9905-972 2301D Digital Control Series

Configured for precise speed control and automatic load sharing in generator sets, the Woodward 9905-972 (9905-972 Digital Load Sharing and Speed Control Module) provides direct physical/electrical execution.

Hardware Specifications

Actuator Loop Feedback Response & Governor Regulation

The module functions as a core processing engine to execute digital speed regulation through a 1 to 20,000 Hz frequency signal fed directly from a magnetic pickup (MPU) sensor. The internal 2301D logic paths run discrete proportional, integral, and derivative (PID) algorithms to adjust for dynamic speed deviations, outputting either high-frequency PWM parameters or linear 4-20 mA current vectors to the throttle actuator.

This dedicated actuator loop feedback response architecture stabilizes prime movers against immediate kilowatt (kW) spikes. When running in multi-unit network grids, the module interacts with external Woodward DSLC units via dedicated analog channels, matching real-time load distribution profiles to preserve frequency synchronization across isolated or utility-tied generator buses.

Frequently Asked Questions

Q: Does the 9905-972 support live hot-swap wire extraction while the generator fuel loop is active? A: No. Removing the terminal links or cutting the 18-32 VDC supply path under load will drop the actuator drive current instantly. This drops the governor throttle positioning loop, triggering an immediate uncommanded engine shutdown or overspeed trip.

Q: How does the unit process an sudden loss of the primary magnetic pickup speed reference? A: The module executes integrated sensor tracking validation. If the magnetic pickup frequency drops below the 1 Hz operational threshold while the run confirmation state is logic high, the module flags an MPU failure alarm and sets the actuator output current to zero to isolate the fuel feed.

Q: Can the 6-channel analog inputs on this module register multi-mode current and voltage signals? A: Yes. The 6-channel analog input matrix is configurable via the local interface or PC software tool, mapping various field sensors alongside standard 4-20 mA output lines to drive downstream governor sub-systems.

Field Installation Guidelines

• Chassis Thermal Dissipation: Secure the panel-mounted metal housing to a flat, unpainted mounting surface inside the main control enclosure. Ensure surrounding layout limits are kept clear to allow passive vertical air convention through the integrated chassis heat sinks.
• Magnetic Pickup (MPU) Shield Integrity: Always route the high-frequency MPU sensor circuit using specialized twisted-pair shielded cable. Terminate the drain shield solely at the designated control grounding terminal, ensuring it remains isolated at the engine casing to eliminate noise induction.
• Signal Line Routing Separation: Maintain distinct structural separation between the low-voltage 4-20 mA actuator drive runs and the primary high-current generator output lines. Use grounded steel conduits for signal runs to protect the internal 2301D digital logic core from high-frequency electromagnetic fields.