Product Overview

The Woodward 9905-002 (SPM-A Series) serves as a high-integrity, microprocessor-based control solution for automatic generator synchronization and proportional load sharing. It continuously monitors the voltage, frequency, and phase angle of an incoming generator relative to the busbar. By adjusting the speed and voltage of the offline unit, the 9905-002 ensures perfect alignment before issuing the breaker close command. As part of the 2301A architecture, this module also manages isochronous and droop speed regulation, making it a cornerstone for stable power generation in both isolated microgrids and parallel utility connections.

Condition: 100% Brand New Original Factory Stock.

Technical Specifications

The 9905-002 integrates advanced sensing with rugged actuation outputs to manage engines and turbines across a wide RPM spectrum.

Engineering Advantages

• Elimination of Synchronization Shock: The 9905-002 precisely matches the phase angle and frequency before closing the breaker. This prevents mechanical stress on the engine couplings and electrical surges in the windings, extending the life of the generator set.

• Flexible Load Regulation: Engineers can toggle between Isochronous mode (for constant frequency in isolated systems) and Droop mode (for proportional load sharing when paralleled with a utility grid). This versatility allows one module to serve multiple operational profiles.

• Seamless Woodward Ecosystem Integration: The module interfaces directly with Woodward speed controls and voltage regulators (AVRs). It utilizes standard Magnetic Pickup Unit (MPU) inputs and analog bias signals, simplifying the retrofit of older analog governor systems.

• Industrial-Grade Resilience: Built for the harshest environments, the unit operates reliably from -40°C up to +85°C. The rugged, panel-mounted chassis resists the high-vibration levels typical of marine propulsion and heavy industrial power plants.

• Enhanced Diagnostics: Integrated LED status indicators provide immediate feedback on synchronization progress and fault conditions. This allows technicians to troubleshoot phase mismatches or signal loss at a glance without complex external diagnostic tools.

FAQs

Q: Can the 9905-002 handle both 50Hz and 60Hz systems?

A: Yes. The microprocessor-based design allows the unit to synchronize and control speed across all standard global frequencies. You calibrate the speed range based on your MPU signal and the specific engine requirements via the onboard potentiometers or configuration interface.

Q: Is the 9905-002 a direct replacement for older analog 2301 series units?

A: In most cases, yes. The 9905-002 provides superior precision and stability compared to older analog versions. However, always verify the input power requirements (this model uses 24VDC) and terminal mapping against your existing wiring diagram to ensure a seamless swap.

Q: What happens if the MPU (Magnetic Pickup) signal is lost?

A: The 9905-002 includes built-in failsafe logic. If the speed signal is lost, the unit identifies the fault and prevents the breaker from closing. It also triggers an alarm state to protect the engine from overspeed or uncontrolled fuel injection.

Q: Does this unit include a manual override?

A: Yes. The 9905-002 supports both manual and automatic modes. This flexibility is essential during commissioning, allowing operators to manually adjust speed and voltage before handing over control to the automated synchronization logic.