Description
Product Overview
The Woodward 9905-973 is a high-precision digital load sharing module designed for multi-engine generator set applications requiring seamless paralleling and load distribution. As part of Woodward’s 9900 series of power management solutions, this advanced controller provides ±0.5% load sharing accuracy between paralleled generators while maintaining isochronous speed control. The 9905-973 features dual-redundant CANbus networks and adaptive cross-current compensation, ensuring stable operation during large load steps and unbalanced conditions. Its rugged aluminum enclosure (IP65) withstands harsh industrial environments (-40°C to +85°C, 5G vibration), making it ideal for marine, oil & gas, and mission-critical standby power applications. With embedded synchronization and black start capability, the Woodward 9905-973 delivers reliable performance for complex power generation systems.
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 9905-973 |
| Manufacturer | Woodward |
| Product Type | Digital Load Sharing Controller |
| Control Modes | Isochronous/Droop, Baseload, Peak Shaving |
| Load Share Accuracy | ±0.5% of rated load |
| Synchronization | <2° phase, <0.5% voltage |
| Input Signals | 3× MPU, 6× 4-20mA, 12× DI |
| Output Signals | 4× 4-20mA, 8× relay, 2× servo (±200mA) |
| Communication | Dual CANbus, Modbus RTU |
| Power Supply | 24V DC (18-36V) |
| Response Time | <100ms for load changes |
| Operating Temp. | -40°C to +85°C |
| Vibration Resistance | 5G (10-500Hz) |
| Protection Rating | IP65 (NEMA 4) |
| Certifications | DNV-GL, ABS, UL |
WOODWARD 9905-973
Main Features and Advantages
Advanced load management: The Woodward 9905-973 implements adaptive cross-current compensation that dynamically adjusts gain parameters based on real-time system response, eliminating hunting during load transients. Its Neural Sync algorithm reduces synchronization time by 50% compared to conventional methods.
Fault-tolerant architecture: Dual independent control channels with automatic transfer logic ensure continuous operation. The module’s triple-redundant speed sensing with voting logic meets API 670 worst-case failure scenarios.
Comprehensive diagnostics: Built-in waveform capture (30-cycle memory) analyzes transient events, while 64-hour trend logging tracks generator performance. The 9905-973 automatically detects and compensates for failed sensors or signal loss.
Marine-certified robustness: Featuring salt fog-resistant components and conformal-coated PCBs, the controller survives harsh marine environments. Its -40°C cold start capability ensures reliability in arctic conditions.
WOODWARD 9905-973
Application Field
The Woodward 9905-973 is deployed in demanding power generation scenarios:
Marine Vessels: Integrated power systems for cruise ships and offshore support vessels
Oil & Gas: Parallel generator control for drilling rigs and production platforms
Data Centers: Mission-critical backup power synchronization
Mining Operations: Mobile generator set paralleling
Hospital Systems: Fault-tolerant power coordination
Related Products
9905-974: Version with Ethernet/IP connectivity
9905-972: Basic version without synchronization
ProAct Power: Centralized power management system
LSM-9000: Load sharing module for larger systems
SYC-300: Advanced synchronizer
MPU-4000: Marine-certified speed sensors
Installation and Maintenance
Pre-installation preparation: Verify CT/VT ratios and phase rotation before commissioning. Implement shielded twisted pair wiring for all analog signals. Configure CANbus termination resistors (120Ω) at network ends.
Maintenance recommendations: Perform annual load step response tests using Woodward’s GEN-TEST software. Clean cooling fins every 6 months in dusty environments. Monitor communication error counters via embedded diagnostics. The 9905-973 supports hot-swapping in redundant configurations.
Product Guarantee
Woodward provides a 5-year warranty for the 9905-973, covering all electronic components. Each unit undergoes:
500-hour burn-in testing with thermal cycling
Full functional validation at extreme temperatures
NIST-traceable calibration
The Marine Support Program includes:
24/7 emergency response with 4-hour escalation
Lifetime firmware updates
20-year spare parts availability for marine installations
On-site commissioning services for critical systems
